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  • Breaking through the class sealing

    - by Jason Crease
    Do you understand 'sealing' in C#?  Somewhat?  Anyway, here's the lowdown. I've done this article from a C# perspective, but I've occasionally referenced .NET when appropriate. What is sealing a class? By sealing a class in C#, you ensure that you ensure that no class can be derived from that class.  You do this by simply adding the word 'sealed' to a class definition: public sealed class Dog {} Now writing something like " public sealed class Hamster: Dog {} " you'll get a compile error like this: 'Hamster: cannot derive from sealed type 'Dog' If you look in an IL disassembler, you'll see a definition like this: .class public auto ansi sealed beforefieldinit Dog extends [mscorlib]System.Object Note the addition of the word 'sealed'. What about sealing methods? You can also seal overriding methods.  By adding the word 'sealed', you ensure that the method cannot be overridden in a derived class.  Consider the following code: public class Dog : Mammal { public sealed override void Go() { } } public class Mammal { public virtual void Go() { } } In this code, the method 'Go' in Dog is sealed.  It cannot be overridden in a subclass.  Writing this would cause a compile error: public class Dachshund : Dog { public override void Go() { } } However, we can 'new' a method with the same name.  This is essentially a new method; distinct from the 'Go' in the subclass: public class Terrier : Dog { public new void Go() { } } Sealing properties? You can also seal seal properties.  You add 'sealed' to the property definition, like so: public sealed override string Name {     get { return m_Name; }     set { m_Name = value; } } In C#, you can only seal a property, not the underlying setters/getters.  This is because C# offers no override syntax for setters or getters.  However, in underlying IL you seal the setter and getter methods individually - a property is just metadata. Why bother sealing? There are a few traditional reasons to seal: Invariance. Other people may want to derive from your class, even though your implementation may make successful derivation near-impossible.  There may be twisted, hacky logic that could never be second-guessed by another developer.  By sealing your class, you're protecting them from wasting their time.  The CLR team has sealed most of the framework classes, and I assume they did this for this reason. Security.  By deriving from your type, an attacker may gain access to functionality that enables him to hack your system.  I consider this a very weak security precaution. Speed.  If a class is sealed, then .NET doesn't need to consult the virtual-function-call table to find the actual type, since it knows that no derived type can exist.  Therefore, it could emit a 'call' instead of 'callvirt' or at least optimise the machine code, thus producing a performance benefit.  But I've done trials, and have been unable to demonstrate this If you have an example, please share! All in all, I'm not convinced that sealing is interesting or important.  Anyway, moving-on... What is automatically sealed? Value types and structs.  If they were not always sealed, all sorts of things would go wrong.  For instance, structs are laid-out inline within a class.  But what if you assigned a substruct to a struct field of that class?  There may be too many fields to fit. Static classes.  Static classes exist in C# but not .NET.  The C# compiler compiles a static class into an 'abstract sealed' class.  So static classes are already sealed in C#. Enumerations.  The CLR does not track the types of enumerations - it treats them as simple value types.  Hence, polymorphism would not work. What cannot be sealed? Interfaces.  Interfaces exist to be implemented, so sealing to prevent implementation is dumb.  But what if you could prevent interfaces from being extended (i.e. ban declarations like "public interface IMyInterface : ISealedInterface")?  There is no good reason to seal an interface like this.  Sealing finalizes behaviour, but interfaces have no intrinsic behaviour to finalize Abstract classes.  In IL you can create an abstract sealed class.  But C# syntax for this already exists - declaring a class as a 'static', so it forces you to declare it as such. Non-override methods.  If a method isn't declared as override it cannot be overridden, so sealing would make no difference.  Note this is stated from a C# perspective - the words are opposite in IL.  In IL, you have four choices in total: no declaration (which actually seals the method), 'virtual' (called 'override' in C#), 'sealed virtual' ('sealed override' in C#) and 'newslot virtual' ('new virtual' or 'virtual' in C#, depending on whether the method already exists in a base class). Methods that implement interface methods.  Methods that implement an interface method must be virtual, so cannot be sealed. Fields.  A field cannot be overridden, only hidden (using the 'new' keyword in C#), so sealing would make no sense.

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  • How should an object that uses composition set its composed components?

    - by Casey
    After struggling with various problems and reading up on component-based systems and reading Bob Nystrom's excellent book "Game Programming Patterns" and in particular the chapter on Components I determined that this is a horrible idea: //Class intended to be inherited by all objects. Engine uses Objects exclusively. class Object : public IUpdatable, public IDrawable { public: Object(); Object(const Object& other); Object& operator=(const Object& rhs); virtual ~Object() =0; virtual void SetBody(const RigidBodyDef& body); virtual const RigidBody* GetBody() const; virtual RigidBody* GetBody(); //Inherited from IUpdatable virtual void Update(double deltaTime); //Inherited from IDrawable virtual void Draw(BITMAP* dest); protected: private: }; I'm attempting to refactor it into a more manageable system. Mr. Nystrom uses the constructor to set the individual components; CHANGING these components at run-time is impossible. It's intended to be derived and be used in derivative classes or factory methods where their constructors do not change at run-time. i.e. his Bjorne object is just a call to a factory method with a specific call to the GameObject constructor. Is this a good idea? Should the object have a default constructor and setters to facilitate run-time changes or no default constructor without setters and instead use a factory method? Given: class Object { public: //...See below for constructor implementation concerns. Object(const Object& other); Object& operator=(const Object& rhs); virtual ~Object() =0; //See below for Setter concerns IUpdatable* GetUpdater(); IDrawable* GetRenderer(); protected: IUpdatable* _updater; IDrawable* _renderer; private: }; Should the components be read-only and passed in to the constructor via: class Object { public: //No default constructor. Object(IUpdatable* updater, IDrawable* renderer); //...remainder is same as above... }; or Should a default constructor be provided and then the components can be set at run-time? class Object { public: Object(); //... SetUpdater(IUpdater* updater); SetRenderer(IDrawable* renderer); //...remainder is same as above... }; or both? class Object { public: Object(); Object(IUpdater* updater, IDrawable* renderer); //... SetUpdater(IUpdater* updater); SetRenderer(IDrawable* renderer); //...remainder is same as above... };

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  • Availability Best Practices on Oracle VM Server for SPARC

    - by jsavit
    This is the first of a series of blog posts on configuring Oracle VM Server for SPARC (also called Logical Domains) for availability. This series will show how to how to plan for availability, improve serviceability, avoid single points of failure, and provide resiliency against hardware and software failures. Availability is a broad topic that has filled entire books, so these posts will focus on aspects specifically related to Oracle VM Server for SPARC. The goal is to improve Reliability, Availability and Serviceability (RAS): An article defining RAS can be found here. Oracle VM Server for SPARC Principles for Availability Let's state some guiding principles for availability that apply to Oracle VM Server for SPARC: Avoid Single Points Of Failure (SPOFs). Systems should be configured so a component failure does not result in a loss of application service. The general method to avoid SPOFs is to provide redundancy so service can continue without interruption if a component fails. For a critical application there may be multiple levels of redundancy so multiple failures can be tolerated. Oracle VM Server for SPARC makes it possible to configure systems that avoid SPOFs. Configure for availability at a level of resource and effort consistent with business needs. Effort and resource should be consistent with business requirements. Production has different availability requirements than test/development, so it's worth expending resources to provide higher availability. Even within the category of production there may be different levels of criticality, outage tolerances, recovery and repair time requirements. Keep in mind that a simple design may be more understandable and effective than a complex design that attempts to "do everything". Design for availability at the appropriate tier or level of the platform stack. Availability can be provided in the application, in the database, or in the virtualization, hardware and network layers they depend on - or using a combination of all of them. It may not be necessary to engineer resilient virtualization for stateless web applications applications where availability is provided by a network load balancer, or for enterprise applications like Oracle Real Application Clusters (RAC) and WebLogic that provide their own resiliency. It's (often) the same architecture whether virtual or not: For example, providing resiliency against a lost device path or failing disk media is done for the same reasons and may use the same design whether in a domain or not. It's (often) the same technique whether using domains or not: Many configuration steps are the same. For example, configuring IPMP or creating a redundant ZFS pool is pretty much the same within the guest whether you're in a guest domain or not. There are configuration steps and choices for provisioning the guest with the virtual network and disk devices, which we will discuss. Sometimes it is different using domains: There are new resources to configure. Most notable is the use of alternate service domains, which provides resiliency in case of a domain failure, and also permits improved serviceability via "rolling upgrades". This is an important differentiator between Oracle VM Server for SPARC and traditional virtual machine environments where all virtual I/O is provided by a monolithic infrastructure that itself is a SPOF. Alternate service domains are widely used to provide resiliency in production logical domains environments. Some things are done via logical domains commands, and some are done in the guest: For example, with Oracle VM Server for SPARC we provide multiple network connections to the guest, and then configure network resiliency in the guest via IP Multi Pathing (IPMP) - essentially the same as for non-virtual systems. On the other hand, we configure virtual disk availability in the virtualization layer, and the guest sees an already-resilient disk without being aware of the details. These blogs will discuss configuration details like this. Live migration is not "high availability" in the sense of "continuous availability": If the server is down, then you don't live migrate from it! (A cluster or VM restart elsewhere would be used). However, live migration can be part of the RAS (Reliability, Availability, Serviceability) picture by improving Serviceability - you can move running domains off of a box before planned service or maintenance. The blog Best Practices - Live Migration on Oracle VM Server for SPARC discusses this. Topics Here are some of the topics that will be covered: Network availability using IP Multipathing and aggregates Disk path availability using virtual disks defined with multipath groups ("mpgroup") Disk media resiliency configuring for redundant disks that can tolerate media loss Multiple service domains - this is probably the most significant item and the one most specific to Oracle VM Server for SPARC. It is very widely deployed in production environments as the means to provide network and disk availability, but it can be confusing. Subsequent articles will describe why and how to configure multiple service domains. Note, for the sake of precision: an I/O domain is any domain that has a physical I/O resource (such as a PCIe bus root complex). A service domain is a domain providing virtual device services to other domains; it is almost always an I/O domain too (so it can have something to serve). Resources Here are some important links; we'll be drawing on their content in the next several articles: Oracle VM Server for SPARC Documentation Maximizing Application Reliability and Availability with SPARC T5 Servers whitepaper by Gary Combs Maximizing Application Reliability and Availability with the SPARC M5-32 Server whitepaper by Gary Combs Summary Oracle VM Server for SPARC offers features that can be used to provide highly-available environments. This and the following blog entries will describe how to plan and deploy them.

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  • How to dual-boot Windows XP & Ubuntu 12.04

    - by user115554
    When I install Ubuntu 12.04 along side Windows XP, I encountered a choice for "Device for boot loader installation". I selected "Windows XP Professional" Now, when I select Windows XP from the grub, it appeares a black page and Windwos dosent boot. I tried Boot-Repair from Ubuntu but it dosent solve this problem. The only thing that helps me to boot Windwos XP is a Bootable CD of Windows. when I put this CD and boot from CD, it shows some options and when I select "Boot from Hard Drive" , my own Windows boots! Here's is a snippet from the bootinfoscript report: ============================= Boot Info Summary: =============================== => Grub2 (v1.99) is installed in the MBR of /dev/sda and looks at sector 1 of the same hard drive for core.img. core.img is at this location and looks for (,msdos5)/boot/grub on this drive. sda1: __________________________________________________________________________ File system: ntfs Boot sector type: Grub2 (v1.99-2.00) Boot sector info: Grub2 (v1.99-2.00) is installed in the boot sector of sda1 and looks at sector 525709174 of the same hard drive for core.img, but core.img can not be found at this location. No errors found in the Boot Parameter Block. Boot file info: Grub2 (v1.97-1.98) in the file /mbr_backup.log looks at sector 1 of the same hard drive for core.img, but core.img can not be found at this location. Operating System: Windows XP Boot files: /boot.ini /ntldr /NTDETECT.COM

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  • Sun Ray Hardware Last Order Dates & Extension of Premier Support for Desktop Virtualization Software

    - by Adam Hawley
    In light of the recent announcement  to end new feature development for Oracle Virtual Desktop Infrastructure Software (VDI), Oracle Sun Ray Software (SRS), Oracle Virtual Desktop Client (OVDC) Software, and Oracle Sun Ray Client hardware (3, 3i, and 3 Plus), there have been questions and concerns regarding what this means in terms of customers with new or existing deployments.  The following updates clarify some of these commonly asked questions. Extension of Premier Support for Software Though there will be no new feature additions to these products, customers will have access to maintenance update releases for Oracle Virtual Desktop Infrastructure and Sun Ray Software, including Oracle Virtual Desktop Client and Sun Ray Operating Software (SROS) until Premier Support Ends.  To ensure that customer investments for these products are protected, Oracle  Premier Support for these products has been extended by 3 years to following dates: Sun Ray Software - November 2017 Oracle Virtual Desktop Infrastructure - March 2017 Note that OVDC support is also extended to the above dates since OVDC is licensed by default as part the SRS and VDI products.   As a reminder, this only affects the products listed above.  Oracle Secure Global Desktop and Oracle VM VirtualBox will continue to be enhanced with new features from time-to-time and, as a result, they are not affected by the changes detailed in this message. The extension of support means that customers under a support contract will still be able to file service requests through Oracle Support, and Oracle will continue to provide the utmost level of support to our customers as expected,  until the published Premier Support end date.  Following the end of Premier Support, Sustaining Support remains an 'indefinite' period of time.   Sun Ray 3 Series Clients - Last Order Dates For Sun Ray Client hardware, customers can continue to purchase Sun Ray Client devices until the following last order dates: Product Marketing Part Number Last Order Date Last Ship Date Sun Ray 3 Plus TC3-P0Z-00, TC3-PTZ-00 (TAA) September 13, 2013 February 28, 2014 Sun Ray 3 Client TC3-00Z-00 February 28, 2014 August 31, 2014 Sun Ray 3i Client TC3-I0Z-00 February 28, 2014 August 31, 2014 Payflex Smart Cards X1403A-N, X1404A-N February 28, 2014 August 31, 2014 Note the difference in the Last Order Date for the Sun Ray 3 Plus (September 13, 2013) compared to the other products that have a Last Order Date of February 28, 2014. The rapidly approaching date for Sun Ray 3 Plus is due to a supplier phasing-out production of a key component of the 3 Plus.   Given September 13 is unfortunately quite soon, we strongly encourage you to place your last time buy as soon as possible to maximize Oracle's ability fulfill your order. Keep in mind you can schedule shipments to be delivered as late as the end of February 2014, but the last day to order is September 13, 2013. Customers wishing to purchase other models - Sun Ray 3 Clients and/or Sun Ray 3i Clients - have additional time (until February 28, 2014) to assess their needs and to allow fulfillment of last time orders.  Please note that availability of supply cannot be absolutely guaranteed up to the last order dates and we strongly recommend placing last time buys as early as possible.  Warranty replacements for Sun Ray Client hardware for customers covered by Oracle Hardware Systems Support contracts will be available beyond last order dates, per Oracle's policy found on Oracle.com here.  Per that policy, Oracle intends to provide replacement hardware for up to 5 years beyond the last ship date, but hardware may not be available beyond the 5 year period after the last ship date for reasons beyond Oracle's control. In any case, by design, Sun Ray Clients have an extremely long lifespan  and mean time between failures (MTBF) - much longer than PCs, and over the years we have continued to see first- and second generations of Sun Rays still in daily use.  This is no different for the Sun Ray 3, 3i, and 3 Plus.   Because of this, and in addition to Oracle's continued support for SRS, VDI, and SROS, Sun Ray and Oracle VDI deployments can continue to expand and exist as a viable solution for some time in the future. Continued Availability of Product Licenses and Support Oracle will continue to offer all existing software licenses, and software and hardware support including: Product licenses and Premier Support for Sun Ray Software and Oracle Virtual Desktop Infrastructure Premier Support for Operating Systems (for Sun Ray Operating Software maintenance upgrades/support)  Premier Support for Systems (for Sun Ray Operating Software maintenance upgrades/support and hardware warranty) Support renewals For More Information For more information, please refer to the following documents for specific dates and policies associated with the support of these products: Document 1478170.1 - Oracle Desktop Virtualization Software and Hardware Lifetime Support Schedule Document 1450710.1 - Sun Ray Client Hardware Lifetime schedule Document 1568808.1 - Document Support Policies for Discontinued Oracle Virtual Desktop Infrastructure, Sun Ray Software and Hardware and Oracle Virtual Desktop Client Development For Sales Orders and Questions Please contact your Oracle Sales Representative or Saurabh Vijay ([email protected])

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  • Easy Transfer from a dead computer

    - by Nathan DeWitt
    I had a computer that electrocuted me and the company sent me a new one. The hard drive from the old computer works fine and is in my new computer. I would like to transfer my files from the old drive to the new one, preferably using Easy Transfer (old & new computers were Win7). When I go through the Easy Transfer wizard, it assumes my old computer is running and that I can run a process to backup all my data to a single file. However, in my case I have the system drive in my new computer and want to pull the data off it. I would like to avoid rebooting the old computer, to avoid damage to myself or my data. I would like to avoid booting into the old system drive, as my new hardware is significantly different and I imagine I'll run into some missing hardware issues. What's the easiest way to get my data off this drive?

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  • problems with WindowsImageBackup and write protected drives

    - by Ralph Shillington
    On Windows 7 I created a System image of my computer (C: and reserved partition) onto a USB drive. No problem. I then formatted the C: and installed the OS -- no problem Now I would like use the System Image and get back some of my documents etc. But I can't get access wo the WindowsImageBackup folder on the USB drive 1) Somehow the drive is write protected --- how did that happen? How do I unprotect that drive. 2) I can't access the WindowsImageBackup folder because I suspect the ACL is out of wack with my new SID. I would add my new SID to the ACL but I can't because the drive is write protected At the moment I'm completely disconnected from my files, which I thought (and still hope) are backed up. Understandably, panic is now setting in.

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  • Where did my free space go?

    - by Ari B. Friedman
    I have a storage drive (2TB) and an OS drive (90GB SSD). I've run out of space on the OS drive: /$ df -h Filesystem Size Used Avail Use% Mounted on /dev/sdb1 72G 72G 0 100% / udev 5.9G 12K 5.9G 1% /dev tmpfs 2.4G 1.2M 2.4G 1% /run none 5.0M 0 5.0M 0% /run/lock none 5.9G 428K 5.9G 1% /run/shm /dev/sda1 1.9T 639G 1.2T 37% /media/StorageDrive So be it. But when I attempt to figure out where the space has gone, I cannot find it anything remotely approaching the capacity of the drive: /$ sudo du -h -d 1 du: cannot access `./media/StorageDrive/home/ari/.gvfs': Permission denied 675G ./media 2.3G ./var 0 ./proc 7.0M ./tmp 27M ./boot 4.0K ./lib64 12K ./dev 44M ./home 16K ./lost+found 8.0M ./sbin 223M ./lib 4.0K ./selinux 1.4M ./run 140K ./root 8.8M ./bin 4.0K ./mnt 38M ./etc 8.0K ./srv 4.8G ./usr 65M ./opt 0 ./sys 682G . Note the difference between the total (682G) and the mounted drives in /media (675G) is only about 9G. How are 72G being used? Where is this dark matter hiding?

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  • Oracle RightNow CX for Good Customer Experiences

    - by Andreea Vaduva
    Oracle RightNow CX is all about the customer experience, it’s about understanding what drives a good interaction and it’s about delivering a solution which works for our customers and by extension, their customers. One of the early guiding principles of Oracle RightNow was an 8-point strategy to providing good customer experiences. Establish a knowledge foundation Empowering the customer Empower employees Offer multi-channel choice Listen to the customer Design seamless experiences Engage proactively Measure and improve continuously The application suite provides all of the tools necessary to deliver a rewarding, repeatable and measurable relationship between business and customer. The Knowledge Authoring tool provides gap analysis, WYSIWIG editing (and includes HTML rich content for non-developers), multi-level categorisation, permission based publishing and Web self-service publishing. Oracle RightNow Customer Portal, is a complete web application framework that enables businesses to control their own end-user page branding experience, which in turn will allow customers to self-serve. The Contact Centre Experience Designer builds a combination of workspaces, agent scripting and guided assistances into a Desktop Workflow. These present an agent with the tools they need, at the time they need them, providing even the newest and least experienced advisors with consistently accurate and efficient information, whilst guiding them through the complexities of internal business processes. Oracle RightNow provides access points for customers to feedback about specific knowledge articles or about the support site in general. The system will generate ‘incidents’ based on the scoring of the comments submitted. This makes it easy to view and respond to customer feedback. It is vital, more now than ever, not to under-estimate the power of the social web – Facebook, Twitter, YouTube – they have the ability to cause untold amounts of damage to businesses with a single post – witness musician Dave Carroll and his protest song on YouTube, posted in response to poor customer services from an American airline. The first day saw 150,000 views and is currently at 12,011,375. The Times reported that within 4 days of the post, the airline’s stock price fell by 10 percent, which represented a cost to shareholders of $180 million dollars. It is a universally acknowledged fact, that when customers are unhappy, they will not come back, and, generally speaking, it only takes one bad experience to lose a customer. The idea that customer loyalty can be regained by using social media channels was the subject of a 2011 Survey commissioned by RightNow and conducted by Harris Interactive. The survey discovered that 68% of customers who posted a negative review about a holiday on a social networking site received a response from the business. It further found that 33% subsequently posted a positive review and 34% removed the original negative review. Cloud Monitor provides the perfect mechanism for seeing what is being said about a business on public Facebook pages, Twitter or YouTube posts; it allows agents to respond proactively – either by creating an Oracle RightNow incident or by using the same channel as the original post. This leaves step 8 – Measuring and Improving: How does a business know whether it’s doing the right thing? How does it know if its customers are happy? How does it know if its staff are being productive? How does it know if its staff are being effective? Cue Oracle RightNow Analytics – fully integrated across the entire platform – Service, Marketing and Sales – there are in excess of 800 standard reports. If this were not enough, a large proportion of the database has been made available via the administration console, allowing users without any prior database experience to write their own reports, format them and schedule them for e-mail delivery to a distribution list. It handles the complexities of table joins, and allows for the manipulation of data with ease. Oracle RightNow believes strongly in the customer owning their solution, and to provide the best foundation for success, Oracle University can give you the RightNow knowledge and skills you need. This is a selection of the courses offered: RightNow Customer Service Administration Rel 12.02 (3 days) Available as In Class and Live Virtual Class (Release 11.11 is available as In Class, Live Virtual Class and Training On Demand) This course familiarises users with the tasks and concepts needed to configure and maintain their system. RightNow Customer Portal Designer and Contact Center Experience Designer Administration Rel 12.02 (2 days) Available as In Class and Live Virtual Class (Release 11.11 is available as In Class, Live Virtual Class and Training On Demand) This course introduces basic CP structure and how to make changes to the look, feel and behaviour of their self-service pages RightNow Analytics Rel 12.02 (2 days) Available as In Class, Live Virtual Class and Training On Demand (Release 11.11 is available as In Class and Live Virtual Class) This course equips users with the skills necessary to understand data supplied by standard reports and to create custom reports RightNow Integration and Customization For Developers Rel 12.02 (5-days) Available as In Class and Live Virtual Class (Release 11.11 is available as In Class, Live Virtual Class and Training On Demand) This course is for experienced web developers and offers an introduction to Add-In development using the Desktop Add-In Framework and introduces the core knowledge that developers need to begin integrating Oracle RightNow CX with other systems A full list of courses offered can be found on the Oracle University website. For more information and course dates please get in contact with your local Oracle University team. On top of the Service components, the suite also provides marketing tools, complex survey creation and tracking and sales functionality. I’m a fan of the application, and I think I’ve made that clear: It’s completely geared up to providing customers with support at point of need. It can be configured to meet even the most stringent of business requirements. Oracle RightNow is passionate about, and committed to, providing the best customer experience possible. Oracle RightNow CX is the application that makes it possible. About the Author: Sarah Anderson worked for RightNow for 4 years in both in both a consulting and training delivery capacity. She is now a Senior Instructor with Oracle University, delivering the following Oracle RightNow courses: RightNow Customer Service Administration RightNow Analytics RightNow Customer Portal Designer and Contact Center Experience Designer Administration RightNow Marketing and Feedback

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  • Windows 2008 as home file server and more

    - by Christian W
    I currently have a freenas-unit as a NAS, and a Win2k8R2-unit as server. However I would like to consolidate these to units in one. What I really like about the freenas-unit is the ZFS filesystem. And the only reason I care about the ZFS filesystem is the easy way I can grow an existing filesystem just by inserting a new drive. How would this work in Win2k8? If I setup my unit with a separate drive as C: and a 1TB drive as D:. The D: would then be segmented into d:\Videos d:\Music d:\Pictures. When everything gets close to filling the storage-drive, I would like to expand the storage, but I wouldn't want to have E:\Videos or d:\Videos2 (using the NTFS folder mount thingy). I still want all my Videos to reside in D:\Videos and I want the OS to decide which drive it's going to be stored on... Some kind of on-the-fly jbod expansion :) Is this at all possible in Windows 2008?

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  • Impossible to install Ubuntu 10.10 dual boot with Windows 7 on new Acer desktop computer

    - by Don Myers
    My brother has a brand new Acer Desktop with Windows 7. I have done many installs (40+) of Ubuntu starting with 8.10, and have never run into this. I've spent three hours trying to do a dual boot install of 10.10. When you get to the place where you normally would choose to install as a dual boot or overwrite the existing information on the hard drive, that block is just blank. Nothing. No choices even to do a manual partition setup. If you try to go on you get the message "No root file system is defined. Please correct this from the partitioning menu." but there is nothing in the partitioning menu. I tried a good 10.04 disc also. Same thing happens with it. I ran a gparted live cd, and it shows the hard drive as sda with 3 partitions on the original. sda1 is a small partition called PQService. sda2 is another small partition called System Reserved, and GParted says it is the boot partition. sda3 is the main partation with the operating system (Windows 7) and all of the empty space. There is a little unallocated space at the very beginning and very end of the hard drive. If I go to places in the Live CD, it shows a 640 gb hard disk called Acer, but it also shows a 640 gb hard disk called system reserved. They are the same disk. There is just one hard drive. If you click properties in the System Reserved 640 gb, it shows all information as unknown. I had to change the boot order in the bios in order to run the live cd. The hard drive instead of being listed as such is listed as Raid:Raid Ready. Something the way this computer is set up is preventing Ubuntu from being able to identify the hard drive partitions at all to do an install, even if you were not doing a dual boot and just wanted to overwrite Windows. Is this a bug that needs reported? This is a major problem for me and my brother, but also for Ubuntu if new users want to Ubuntu and find they cannot install it.

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  • Tomcat - virtualhosting - name / ip / port - based

    - by lisak
    Hey, what are the usage scenarios for these kinds of virtual hosting ? Name Based - typical tomcat virtual hosting, one HOME instance with many contexts, each as an individual host IP based / port based - multiple instances of tomcat ( how is it with performance and memory consuption?) running on IP aliases (virtual IPs) for one network adapter, usually behind http apache server that can run name based virtual hostings. Otherwise I can't figure out how would I forward requests in iptables/firewall based on IP address, which is just one. How is IP based virtual hosting done as to Tomcat and multiple instances ? I'd like to hear some usage scenarios from your experience. How are you running your applications. Cause there are applications having it's own modified classloader and they are developed in a way to run alone withing a tomcat instance. Then there are trivial applications which can run within one instance without problems. Many thanks

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  • why is usb disk corrupted by Vista restore

    - by Martin
    I have a laptop with Vista Business on an 80GB disk. I have created a full backup and stored that on the original 80GB drive. On my new 320GB disk, I have created a partition with exactly the same number of bytes as the original 80GB disk. I swap the disks so that the 320GB is internal, and the 80GB is in a USB caddy. I boot from the NEO restore CD and everything looks fine: I select the dump on the USB drive, target is drive C:, start the restore. After a few seconds, the restore fails with "not enough disks in machine or disk not large enough" error (I did note the exact phrase). I then swap the 80GB disk back to the internal drive, but the thing is unbootable. Why has the restore process scrubbed the boot status of the USB drive ?

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  • HTG Explains: Why You Only Have to Wipe a Disk Once to Erase It

    - by Chris Hoffman
    You’ve probably heard that you need to overwrite a drive multiple times to make the data unrecoverable. Many disk-wiping utilities offer multiple-pass wipes. This is an urban legend – you only need to wipe a drive once. Wiping refers to overwriting a drive with all 0’s, all 1’s, or random data. It’s important to wipe a drive once before disposing of it to make your data unrecoverable, but additional wipes offer a false sense of security. Image Credit: Norlando Pobre on Flickr HTG Explains: Learn How Websites Are Tracking You Online Here’s How to Download Windows 8 Release Preview Right Now HTG Explains: Why Linux Doesn’t Need Defragmenting

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  • Can VMWare Workstation 7.x and Sun VirtualBox 3.1.x co-exist on the same Windows 7 64bit Host togeth

    - by Heston T. Holtmann
    Will installing Sun Virtual Box bash or interfere with my VMWare installtion? I don't need to run VMs from both Virtual-Machine software packages at the same time but I do need to run some older Virtual-Machines from Sun-Virtualbox on the same 64-bit Windows 7 host until I can migrate those VMs to VMWare. Before switching from Linux host to Windows host, I ensured to export the VirtualBox VM to an OVF "appliance" with intentions of importing into VMWare Workstation 7. But VMWare gives me an error stating it can't import it. Background info My old workstation host: 32-bit Ubuntu 9.04 running Sun Virtual Box 3.x hosting Windows-XP VM Guest for Windows Software app development (VS2008, etc) Needs I need to get my original Sun-VBox Windows-XP Guest running on my new Windows 7 Workstation either imported into VMWare or running on the Windows version of Sun-Virtual box (I have the VM-Guest Backed up and copied to the new computer data drive. New workstation host: 64bit Windows 7 running VMWare Workstation 7 to host 32bit Ubuntu 9.10 for linux project work.

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  • Tripple boot install with Windows MBR

    - by Andre Doria
    I have 2 hard drives, each 1TB. First drive has only Windows 7. The second drive has Kali installed on logical partitions #5 (/boot), #6 (/), #7 (/home), and #8 (swap). The bootloader is installed in /dev/sdb5. It also has Ubuntu installed on logical partitions #9 (/boot), #10 (/), #11 (/home), and #12 (swap). I want to use Windows bootloader, so I use easyBCD to configure the boot menu. EasyBCD sees my second drive partitions as #1, #2, #3,..., #8. I then add Kali selecting second drive #1 (/boot) partition, and Ubuntu selecting its #5 (/boot) partition. After this my menu has choices of Windows 7 (default), Kali, and Ubuntu. The problem is that whether I select Kali or Ubuntu I always boot Kali! Any idea on how to enable Ubuntu boot while also keep using Windows bootloader in MBR?

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  • Oracle Partner Tier1, inc. Launches the Tier1 Private Oracle Cloud

    - by Catalin Teodor
    Tier1, Inc. announced the availability of the Tier1 Private Oracle Cloud, the most optimized and protected computing environment for Oracle Applications and databases. Leveraging Oracle's Virtual Compute Appliance (VCA) technology, it’s the only virtual environment certified to use Oracle Trusted Partitions – the Tier1 Private Cloud provides the flexibility to license Oracle software on a virtual CPU basis. Read more!

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  • Oracle VDI Seminar - June-30

    - by mprove
    More from Andy Hall about Oracle VDI:  Oracle Virtual Desktop Infrastructure allows you to bring your desktop environments under control by hosting and managing them centrally in the data center. Users then connect to their desktops over the network using their existing PCs and simple client software, or with Oracle's Sun Ray Clients. Virtual desktops provide a number of benefits, including:  Cost reductions by allowing global or local changes and updates to the desktop environment from a centralized management location.  Better security by keeping sensitive data off of individual computers and retaining it safely in the data center.  Improved availability and business continuity because workers can access their desktops from nearly anywhere.  Join us to get the latest updates on Oracle Virtual Desktop Infrastructure and learn how moving to a virtualized desktop environment can help your organization, today and into the future.  Speaker:  Andy Hall - Virtual Desktop Infrastructure Product Management, Oracle Event Date: 06/30/2011 09:00 AM Pacific Daylight Time Register here_

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  • Prevent Ultrabay HDD from ejecting on sleep

    - by Bryce Evans
    I have a lenovo T430s thinkpad with a small SSD primary drive and 500gb ultrabay drive. When I put the computer to sleep and then return, I get the message titled "problem ejecting < drive name " "Windows can't stop your 'Generic volume' device because a program is still using it." This pop up is very annoying every time every time I use the computer. I don't want to disable write caching [D:Hardware[drive]policiesquick removal] because I want best performance and never remove the drive. Any ways to avoid this pop up?

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  • VirtualBox appliance for the Oracle Communications Service Delivery Platform (SDP) Products

    - by chlander
    It's been quite awhile since we last blogged. This blog is written by Leif Lourie, a Curriculum Developer for the Oracle Communications Service Delivery Platform (SDP) products. For the last 8 years, Leif has worked as a Curriculum Developer for many of the telecom-oriented products that Oracle offers. He has been working in the telecom industry for about 25 years and has also worked as a software developer, project manager, and solutions architect. He is currently working on courseware for an upcoming release for one of the Service Delivery Platform products. Thanks to Leif not only for this blog, but for making the VM described in the blog available. Cheryl Lander, Oracle Communications InfoDev Senior Director To be able to download, install and test a product within a day is many times very important for people that are doing the primary evaluation of a software product. If it takes longer, it will require a bigger effort, like a proof-of-concept project with many people involved. Of course, if the product is chosen for a more thorough test, it will probably happen anyway, but then maybe with focus on integration instead of product features. We have a long tradition of creating complex software that is easy to install and test and we have often been praised for the ease of getting our products up and running. One key for this has been that there has always been an installer for Windows, as well as for the production environments that usually are Unix and Linux. And, the windows installer has, in most cases, been released for developing and testing purposes. Lately, this has changed. Our products are very seldom released for the Windows platform, at all. And even the Linux versions are almost always released for 64-bit systems. This is creating problems for many of the people that want to try out our products, since few have access to a 64-bit Linux system of the right platform. Most of us are using a laptop with Windows or Mac OS. Some of us are using Linux or Solaris, but probably a non certified distribution for the product you want to test. My job, among other things, is to develop hands-on practices for our products. For me, it is crucial to have access to environments for installing and using our products. For this reason I have been using virtual machines for many years.I have a ready-made base system, with the necessary tools installed for all the products I create hands-on practices for. Whenever I start working on hands-on practices for a new product or a new version, I just copy the base system and start working with a clean slate. This saves me a lot of time! Now, I would like to start saving time for my favorite student: You! If you are using our products and regularly test new versions you might benefit from the virtual machine that is now available on Oracle Technology Network: The Virtual Machine for the Oracle Communications Service Delivery Platform (SDP) Products. This virtual machine contains an installation of the 64-bit version of Oracle Enterprise Linux, version 6. It also has Oracle Database Express Edition (XE), Oracle Java and Oracle Enterprise Pack for Eclipse installed. By using Oracle VM VirtualBox you may use Windows, OS X, Linux or Solaris on your laptop. VirtualBox can be installed on top of any of these platforms and give you the ability to run virtual machines in your laptop. After downloading and starting the virtual machine you will also need to download the installation files for the product you want to test; for example Oracle Communications Services Gatekeeper or Oracle Communications Online Mediation Controller. In some cases there are lessons and practices available for the products. The freely available courses are listed in Oracle Learning Library as a Collection of Oracle Communications Service Delivery Platform Courses. As time goes by, we will make this list collection bigger. Also, the goal is to update the virtual machine about one to two times per year. So you will always be able to get a well maintained virtual machine for the Service Delivery Platform products from us. We Value Your Feedback If you would like to suggest improvements or report issues on any of the product documentation, curriculum, or training produced by the Oracle Communications Information Development team, you can use these channels: Email [email protected]. Post a comment on this blog. Thanks for reading!

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  • User account shows two Downloads folders

    - by Chris Lieb
    I have my user account on my D drive and junction'd to the C:\users folder. I accidentally moved my profile Downloads folder (C:\users\me\Downloads) and then moved it back to its path on the D drive (C:\me\Downloads). After doing this, the directory tree for my user profile lists two Downloads directories, one located at C:\users\me and one at D:\me. I tried deleting the directory from the D drive, then restoring it from the Recycle Bin to the proper location on the C drive (actually the D drive, accessed through the junction), but it gave me the two Downloads directories again. Is there some way to fix this so that the only listing is for the C:\users\me\Downloads directory, like it was to begin with?

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