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• How to define a layered model for Storage Architecture ?

  - by Berkay

  i don't have enough knowledge about storage systems but have to tell my audiences about how storage works in organization data centers. For this purpose to keep things simple, first i want to show them a layer model then from top to bottom and then i want to explore all these layers. What i mean by layered model in storage architecture? i want to start my presentation something like that, first layer can be applications, application request a data from storage and then ... ... (the topics i want to cover are file sytems, metadata,the physical implementation of storage (das, nas etc.) ... the request comes to the storage device and storage device (depends on the technology) goes through the disk and disk send back the data using iscsi protol, we can say that the iscsi protocol managing the path between... ... if you help me explain these steps layer by layer by examples and key technologies to be defined, really appreciate it. thanks.

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• Understanding UML composition better

  - by Prog

  The technical difference between Composition and Aggregation in UML (and sometimes in programming too) is that with Composition, the lifetime of the objects composing the composite (e.g. an engine and a steering wheel in a car) is dependent on the composite object. While with Aggregation, the lifetime of the objects making up the composite is independent of the composite. However I'm not sure about something related to composition in UML. Say ClassA is composed of an object of ClassB: class ClassA{ ClassB bInstance; public ClassA(){ bInstance = new ClassB(); } } This is an example of composition, because bInstance is dependent on the lifetime of it's enclosing object. However, regarding UML notation - I'm not sure if I would notate the relationship between ClassA and ClassB with a filled diamond (composition) or a white diamond (aggregation). This is because while the lifetime of some ClassB instances is dependent of ClassA instances - there could be ClassB instances anywhere else in the program - not only within ClassA instances. The question is: if ClassA objects are composed of ClassB objects - but other ClassB objects are free to be used anywhere else in the program: Should the relationship between ClassA and ClassB be notated as aggregation or as composition?

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• When too much encapsulation was reached

  - by Samuel

  Recently, I read a lot of gook articles about how to do a good encapsulation. And when I say "good encapsulation", I don't talk about hiding private fields with public properties; I talk about preventing users of your Api to do wrong things. Here is two good articles about this subject: http://blog.ploeh.dk/2011/05/24/PokayokeDesignFromSmellToFragrance.aspx http://lostechies.com/derickbailey/2011/03/28/encapsulation-youre-doing-it-wrong/ At my job, the majority a our applications are not destined to other programmers but rather to the customers. About 80% of the application code is at the top of the structure (Not used by other code). For this reason, there is probably no chance ever that this code will be used by other application. An example of encapsulation that prevent user to do wrong thing with your Api is to return an IEnumerable instead of IList when you don't want to give the ability to the user to add or remove items in the list. My question is: When encapsulation could be considered like too much of purism object oriented programming while keeping in mind that each hour of programming is charged to the customer? I want to do good code that is maintainable, easy to read and to use but when this is not a public Api (Used by other programmer), where could we put the line between perfect code and not so perfect code? Thank you.

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• Azure cloud app subdomain pointing to actual domain

  - by Amit Aggarwal

  Say we have a domain xyz.com registered with some registrar ... we pointed that domain to the name server of our dedicated server where the DNS will be hosted for that domain. Now, we just want that dedicated server to host the emails coming and the domain will point to abc.cloudapp.net (azure cloud app, they don't provide any static IP ... and only public url is given) Now, someone please helping me in editing/creating the DNS file on our dedicated server to make sure things work properly... if possible past here minimum settings we need in DNS file to make sure mails are on dedicated server and app is on cloud... Thanks, Amit

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• Is there a Windows 7 add-on that will put the PID in the title bar of a window?

  - by Chris

  Occasionally I run many instances of something, like Chrome or Visual Studio. Rarely, but often enough to bug me, one of them gets hosed and starts to consume 100% CPU. I can fire up the task manager to see which process is using 100%, but if it just says chrome.exe or devenv.exe, I don't know which window is the culprit. I'd like to know before terminating the process, so I can activate the app and shut it down cleanly. The best I've found so far is to use Process Explorer's feature where I can right click a process and say "bring to front". But I am curious as to whether there is an app that will put the PID(s) right in the title bar of the window so I can tell which window matches the process. I am using Windows 7 64-bit.

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• SkyDrive and Consumer Cloud Services

  - by Tim Murphy

  Paul Thurrrott recently posted an article on the future of SkyDrive and I was asked what I thought about its future by @UserCommunity.  So let’s take a look. The breakdown from Microsoft that Paul described I believe is an accurate representation of users and usages. While I can’t say that I leverage SkyDrive to the extent that it was meant to be I do enjoy having OneNote hosted their and being able to consult and edit it from the desktop, web and Windows Phone. Taking that one step further is the Midwest Geeks group which started as the community of Microsoft related user groups in our region uses SkyDrive groups and shares calendars and documents.  This collaboration aspect isn’t new in itself, but having it connected with the rest of your cloud assets makes life easier. Another recent usage of this type of cloud service is storing your personal music files in order to get that same universal access.  This is a scenario that has some arguments for and against.  On the one hand own once and listen anywhere is great, but the on the other hand the bandwidth cost becomes a giant downside.  This is especially the case since most carriers are now doing away with unlimited data packages. Ultimately I see this type of resource growing an evolving at a phenomenal rate over the next few years as we continue to become more mobile.  Having multiple players such as SkyDrive and iCloud will only help to give us more options.  Only time will tell where we end up next. del.icio.us Tags: SkyDrive,Cloud Services,Paul Thurrott,UserCommunity

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• How do I measure performance of a virtual server?

  - by Sergey

  I've got a VPS running Ubuntu. Being a virtual server, I understand that it shares resources with unknown number of other servers, and I'm noticing that it's considerably slower than my desktop machine. Is there some tool to measure the performance of the virtual machine? I'd be curious to see some approximate measure similar to bogomips, possibly for CPU (operations/sec), memory and disk read/write speed. I'd like to be able to compare those numbers to my desktop machine. I'm not interested in the specs of the actual physical machine my VPS is running on - by doing cat /proc/cpuinfo I can see that it's a nice quad-core Xeon machine, but it doesn't matter to me. I'm basically interested in how fast a program would run in my VPS - how many CPU operations it can make in a second, how many bytes to write to RAM or to disk. I only have ssh access to the machine so the tool need to be command-line. I could write a script which, say, does some calculations in a loop for a second and counts how many loops it was able to do, or something similar to measure disk and RAM performance. But I'm sure something like this already exists.

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• How to make a pxe bootable 10MegaByte or larger dos image?

  - by rjt

  Would like to make a "massive" DOS floppy disk image, say 10MegaBytes or more containing all the firmware updates i need for any system, harddrive, BIOS. i do not need the DOS image to be networkable as everything will be on the PXE booted image, but networking would be nice. Since ZipDisks were attached to the floppy disk controller and were over 100MegaBytes, this should be possible. i tried a long time ago to do this and spent too much time on it only to have it fail to boot. So if someone has reliable instructions on how to create such a nightmarish beast and edit it, please let me know. One image that can used for PXE and copied to a USB stick would be a plus. Too bad manufacturers don't supply a single bootable Linux ISO containing all their firmware updates, that would be easy to boot over-the-lan and have networking. HP servers do this and it is awesome.

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• Grid Infrastructure Management Repository (GIMR) database now mandatory in Oracle GI 12.1.0.2

  - by Mike Dietrich

  During the installation of Oracle Grid Infrastructure 12.1.0.1 you've had the following option to choose YES/NO to install the Grid Infrastructure Management Repository (GIMR) database MGMTDB: With Oracle Grid Infrastructure 12.1.0.2 this choice has become obsolete and the above screen does not appear anymore. The GIMR database has become mandatory.  What gets stored in the GIMR? See the documentation here See the changes in Oracle Clusterware 12.1.0.2 here: Automatic Installation of Grid Infrastructure Management Repository The Grid Infrastructure Management Repository is automatically installed with Oracle Grid Infrastructure 12c release 1 (12.1.0.2). The Grid Infrastructure Management Repository enables such features as Cluster Health Monitor, Oracle Database QoS Management, and Rapid Home Provisioning, and provides a historical metric repository that simplifies viewing of past performance and diagnosis of issues. This capability is fully integrated into Oracle Enterprise Manager Cloud Control for seamless management. Furthermore what the doc doesn't say explicitly: The -MGMTDB has now become a single-tenant deployment having a CDB with one PDB This will allow the use of a Utility Cluster that can hold the CDB for a collection of GIMR PDBs When you've had already an Oracle 12.1.0.1 GIMR this database will be destroyed and recreated Preserving the CHM/OS data can be acchieved with OCULMON to dump it out into node view The data files associated with it will be created within the same disk group as OCR and VOTING  In a future release there may be an option offered to put in into a separate disk group Some important MOS Notes: MOS Note 1568402.1FAQ: 12c Grid Infrastructure Management Repository, states there's no supported procedure to enable Management Database once the GI stack is configured MOS Note 1589394.1How to Move GI Management Repository to Different Shared Storage(shows how to delete and recreate the MGMTDB) MOS Note 1631336.1Cannot delete Management Database (MGMTDB) in 12.1 -Mike

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• WPF or WinForms for Game Development and learning resources?

  - by Stephen Lee Parker

  I'm looking to create a game framework for my own personal use... I want to use WPF, but I'm unsure if that is a wise choice... The games I will be writing should not require high performance graphics, so I am hoping to build on native classes... I do not want to rely on external DLL's unless I generate them myself. The games will be for young children, say 4 to 8. Most will be learning puzzles or simple shooters. The most advanced will be a platform game (non-scrolling screen like the old Atari Miner 2049er game). I think I know how to write something like the old Atari Chopper Command (partially written and my 4 year old loves it, but I used WinForms and GDI), Pac-Man, Tetris, Astroids, Space Invaders, Slider Puzzle, but I do not really know how to write the platform game... In my mind, I'm getting caught in collision detection and how to make a character jump and how to make a character walk up a slope or steps... Can anyone point me to information on developing a platform game in C#? Would you suggest WinForms or WPF for game development? I'm not looking for great graphics and speed, just entertaining game play...

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• Netcat server output with multiple greps

  - by Sridhar-Sarnobat

  I'm trying to send some data from my web browser to a txt file on another computer. This works fine: echo 'Done' | nc -l -k -p 8080 | grep "GET" >> request_data.txt Now I want to do some further processing before writing the http request data to my txt file (involving regex maniuplation). But if I try to do something like this nothing is written to the file: echo 'Done' | nc -l -k -p 8080 | grep "GET" | grep "HTTP" >> request_data.txt (for simplicity of explanation I've used another grep instead of say awk) Why does the 2nd grep not get any data from the output of the first grep? I'm guessing piping with netcat works differently to what I've assumed to get this far. How do I perform a 2nd grep before writing to my txt file? My debugging so far suggests: It is nothing to do with stderr vs stdout Parentheses don't help

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• Bash delete file when variable = x

  - by twigg

  I'm creating a bash script which reboots the system at each reboot it adds a new line to a text file, I then read the text file before each reboot. Once the variable holding the number of lines reaches say 10 I want the script to delete the text file (at which point on the next reboot it will see the file isn't there, brake the loop and promote the user to start again). I tried this: exec < text.txt nol=0 while read line do nol=`expr $nol + 1` done reboot_count=10 if ["$nol" == "$reboot_count"]; then rm text.txt fi but this doesn't seem to be working, all help is appreciated :)

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• Software Developer Interview Question - Fair or Unfair

  - by user607018

  I just phone interviewed with a company for a graduate software developer position and was asked the following questions. I should add that the company concerned are not a database vendor. How does a query optimiser work? If a database was performing badly how would you use the performance logs to find out the problem. I have asked whether they ask such questions of all candidate software developers (graduate or experienced) in a first phone interview. They replied that they like to test their candidates knowledge of database development. I want to write to the company to say that these questions are unreasonable to ask at a software developer interview and to request that my interview be done over. I would like to check the reasonableness of the following assumptions a) Those questions cannot be fairly classified as database development questions. b) I think the questions are appropriate for a DBA interview but wholly unreasonable for a software developer interview (experienced or not). c) The first question is only relevant to a database vendor. d) The second question is not fair because software developers typically don't deal with database performance logs as that is the job of the DBA. Perhaps some of you will be kind enough to comment on my assumptions or may have any other suggestions, before I write to the company.

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• Algorithm for a lucky game [on hold]

  - by Ronnie

  Assume we have the following Keno(lottery type) game: From 80 numbers(from 1 to 80), 20 are being drawn. The players choose 1 or 2 or 3..... or 12 numbers to play(12 categories). If they choose for example 4 then they win if they predict correctly a certain amount of numbers(2,3 or 4) from the 4 they have played and lose if the predict only 1 or 0 numbers. They win X times their money accordingly to some predefined factor depending on how many numbers they predict from each category. The same with the other categories. And e.g 11 out of 11 gives 250000 times your money and 12 out of 12 gives 1000000 your money. So the company would want to avoid winnings so high. Every draw by the company is being made every 5 minutes and in each draw around 120000 (let's say) different predictions(Keno tickets) are being played. Let's assume 12000 are being played in category 10 and 12000 in category 11 and also 12000 in category 12. I'm wondering if there is an algorithm to allow the company that provides the game in the 5 minutes between the drawings, to find a 20 number set, in order to avoid any "12 out of 12" and "11 out of 11" and "11 out of 12" and "10 out of 11" and "10 out of 10" winning ticket. That means is there any algorithm, where in a time of less than 1 minute approximately(in todays hardware), to be able to find a 20 number set so that none of the 12000 12 and 11 and 10 number sets that the players played(in categories 10,11 and 12) contains any winning of "12 out of 12" and "11 out of 11" and "11 out of 12" and "10 out of 11" and "10 out of 10"? Or even better the generalization of the problem: What is the best algorithm(from a perspective of minimal time), to be able to find a Y number set from numbers 1 to Z(e.g Y=20, Z=80) so that none of the X sets of K-numbers that are being played(in category K) contains more than K-m numbers from the Y-set? (Note that for Y=K and m=1 there is a practical algorithm.)

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• adding keyboard shortcuts for OSX terminal or xterm

  - by I J

  Is there a way to add a keyboard shortcut for a terminal command in OSX. Basically most of the times i open the terminal app in MAC in order to ssh into a certain server foo. What I want to do is add a keyboard shortcut (say ^k) so that on a terminal when I do that, it runs "ssh foo" in the terminal. Thanks PS: I think if there is something for the xterm in linux then it should work for the terminal too. So this might not be an OSX specific question. PS2: I want the shortcut to do carriage return with the "ssh foo". If its just "ssh foo", then I can write an alias in .bashrc. My goal is to minimize the number of keystrokes I've to do at the end of the day.

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• Maximum number of files in one ext3 directory while still getting acceptable performance?

  - by knorv

  I have an application writing to an ext3 directory which over time has grown to roughly three million files. Needless to say, reading the file listing of this directory is unbearably slow. I don't blame ext3. The proper solution would have been to let the application code write to sub-directories such as ./a/b/c/abc.ext rather than using only ./abc.ext. I'm changing to such a sub-directory structure and my question is simply: roughly how many files should I expect to store in one ext3 directory while still getting acceptable performance? What's your experience? Or in other words; assuming that I need to store three million files in the structure, how many levels deep should the ./a/b/c/abc.ext structure be? Obviously this is a question that cannot be answered exactly, but I'm looking for a ball park estimate.

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• Building a common syntax and scoping framework.

  - by Ben DeMott

  Hello fellow programmers, I was discussing a project the other day with a colleague of mine and I was curious to see what others had to say or if such a thing already existed. Background There are many programming languages. There are many IDE's and source editors that highlight and edit source code. Following perfectly and exactly the rules of a language to present auto-complete options and understand scopes in the code is rather complex. This task is complex enough that most IDE's implement different source-editors as plugins that often re-implement the same features over and over but in a different way (netbeans). From what I can tell most IDE's and source editors re-implement parsers that use regular expressions, or some meta-syntax Naur Form to describe the languages grammer generically. These parsers are implemented over and over and over again. Question Has anyone attempted to unify or describe a set of features through an API and have a consistent interface to parsing various programming languages and dialects. I'm not describing an IDE - but a consistent API for any program to use to parse and obtain meta-information from the source code. I realize various programming languages offer many different features which are difficult to 'abstract' into a set of features, but I feel this would be a worthwhile venture. It seems to me that this could possibly allow the authors of interpreters to help maintain a central grammer intepreter for their language. the Python foundation could maintain the Python grammer api, ANSI the C grammer api, Oracle the Java grammer API, etc Example usage If this was API existed code documentation generators could theoretically work across all dialects and languages to some level. It wouldn't matter if your project used 5 different languages a single application could document all of them and the comments and doc-tags within. Has anyone attempted this comprehensively?

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• Flash movie randomly freeze the browser

  - by Erick

  Just recently it seems that my flash player have had some troubles to display flash videos (youtube/dailymotions and others like this). This issue was supposed to be fixed with Flash Player 10 beta if I remember correctly. My flash player is currently at the lastest version available (10.0.45.2) I'm currently on Windows 7 x64. I tried to uninstall it and reboot and reinstall it, didn't work. Sometimes when it freeze and I reboot it "fixes" temporary the problem. The freeze problem is each and every browser. If one fails and freeze, every browsers using the plugin or ActiveX (Opera 10.5/Chrome 5/Safari 4/IE 8/FF 3.7 all installed) will freeze upon playing. I'm quite out of inspirations for fixing this up now I dare say.

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• finding the user of iis apppool \ defaultapppool

  - by LosManos

  My IIS apppool user is trying to create a folder but fails. How do I find out which User it is? Let's say I don't know much about IIS7 but need to trace whatever is happening through tools. Place of crime is WinSrv2008 with IIS7. So I fire up Sysinternals/ProcessMonitor to find out what is happening. I find Access denied on a folder just as I suspected. But which user? I add the User column to the output and it says IIS Apppool\Defaultapppool in capitals. Well... that isn't a user is it? If I go to IIS and its Apppools and Advanced settings and Process model and Identity I can see clues about which user it is but that is only because I know IIS. What if it had been Apache or LightHttpd or whatever? How do I see the user to give the appropriate rights to?

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• Naming conventions: camelCase versus underscore_case ? what are your thoughts about it? [closed]

  - by poelinca

  I've been using underscore_case for about 2 years and I recently switched to camelCase because of the new job (been using the later one for about 2 months and I still think underscore_case is better suited for large projects where there are alot of programmers involved, mainly because the code is easier to read). Now everybody at work uses camelCase because (so they say) the code looks more elegant . What are you're thoughts about camelCase or underscore_case p.s. please excuse my bad english Edit Some update first: platform used is PHP (but I'm not expecting strict PHP platform related answers , anybody can share their thoughts on which would be the best to use , that's why I came here in the first place) I use camelCase just as everibody else in the team (just as most of you recomend) we use Zend Framework which also recommends camelCase Some examples (related to PHP) : Codeigniter framework recommends underscore_case , and honestly the code is easier to read . ZF recomends camelCase and I'm not the only one who thinks ZF code is a tad harder to follow through. So my question would be rephrased: Let's take a case where you have the platform Foo which doesn't recommend any naming conventions and it's the team leader's choice to pick one. You are that team leader, why would you pick camelCase or why underscore_case? p.s. thanks everybody for the prompt answers so far

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• How to send Windows key over VNC to Linux from Windows?

  - by MJBoa

  Alright, so I'm running Linux with AwesomeWM on my home machine. I'm running x11vnc on that machine and I want to connect to it from a windows machine. So it suffices to say that I need the Windows key for my home machine to function. I really like TightVNC, but I have found that only RealVNC is able to send the Windows key presses that I need. My problem is that RealVNC is sorely lacking customization and I feel it's inferior to TightVNC and unusable. I know that Ctrl-Esc sends the windows key press in Tight but then I can't use it as a modifier key. Useless. Anyone have any ideas? I don't think it's a server issue since I've tried Tightvnc server on the linux machine and it still doesn't work, at least in TightVNC. It works with Real anyway. Oh and UltraVNC doesn't work either.

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• Task bar remains visible with "Auto-hide the task bar" checked in Windows 7.

  - by Corey

  It's about time that I figure this out. I can say with a pretty high confidence that I have experienced this issue in all consumer versions of Windows since XP. I keep "Auto-hide the task bar" checked to maximize screen real estate. Every once in a while, the task bar will refuse to hide while individual windows will continue to act as if that option is checked (by falling under the task bar). For years, I have fixed this by rebooting. Of course, I cannot predict the timing or frequency of the problem, so the process becomes burdensome. I want to know how this can be fixed without rebooting. It has affected my on multiple machines using multiple versions of Windows, so I cannot be the only one who is bothered by it. Can anyone help me solve this?

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• Getting GTalk and Alt-Tab to play nice

  - by Steve Armstrong

  I'm running GTalk on Windows 7, and it refuses to work properly with Alt-Tab. Let's say I've got 2 message windows open (msg1 and msg2) and the contact list, as well as Firefox. Alt-tab from Firefox to msg1 works, but now the contact list is the most recent thing in the alt-tab list (not Firefox as expected). Then there's the problem that I can't use alt-tab to select a specific message window, and when switching back to msg2 (showing msg2 in the alt-tab window) it might switch back and have focus on msg1. I found this thread complaining about the same problem, but it's over a year old, and I'm hoping some progress has been made.

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• Hardware issue: UI freezes and hard drive light goes solid several times per hour

  - by alchemical

  I have a workstation that has been acting up for the last few weeks. It currently has Windows Server 2008 R2 installed on it, and 2 HDD mirrored. A few times per hour the screen will freeze up, applications will say "not responding", sometimes the screen will turn a lighter shaded color--at the same time the HDD light is on solid. This lasts anywhere from 10 to about 50 seconds. Could this be something with one of the drives or the mechanism keeping the mirror in place? Any other ideas?

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• Reverse rdesktop or VNC overlay image!

  - by carlesso

  Hi all. I've got a central server (linux based) and many clients (Windows XP Embedded, afaik) in public places around my country. I need to have these clients to connect to the server with a "reverse" tunnel, that is to say that I need to control the clients from the server but the connection is initialized by clients. The requirement is that, during the connection, an overlay image (or something like that, like a modified version of login screen) is displayed. Some stuff like "Work In Progress". My first idea was to use vncviewer -listen and vnc in reverse mode, but cannot understand how to obfuscate the work I'm doing. Other idea was to use rdesktop in "reverse" mode, but it seems it does not support it. Using rdekstop reverse seems the nicest solution (I can login back the user was in before connection, the login manager - which I can modified - is displayed), but any hint will be appreciated! Thanks in advance!

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