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  • Should we design programs to randomly kill themselves?

    - by jimbojw
    In a nutshell, should we design death into our programs, processes, and threads at a low level, for the good of the overall system? Failures happen. Processes die. We plan for disaster and occasionally recover from it. But we rarely design and implement unpredictable program death. We hope that our services' uptimes are as long as we care to keep them running. A macro-example of this concept is Netflix's Chaos Monkey, which randomly terminates AWS instances in some scenarios. They claim that this has helped them discover problems and build more redundant systems. What I'm talking about is lower level. The idea is for traditionally long-running processes to randomly exit. This should force redundancy into the design and ultimately produce more resilient systems. Does this concept already have a name? Is it already being used in the industry?

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  • Why does installing 11.10 or 12.04 on old laptops fail?

    - by Adam
    I recently reimaged my Lenovo t400 with Ubuntu. However, after wiping two other systems (Compaq Presario 2100 and Dell Latitude D600) both hUbuntu 11.10 and Ubuntu 12.04 fail to load on boot. I am concerned that there is some type of issue using Ubuntu on these older systems as every part of the process has been repeated/attempted several times in the same manner as practiced in the successful load of the newer Lenovo t400. I now have two laptops without an operating system as the discs/thumb drives that were formatted to load on these devices do not seem to work. I would appreciate any assistance that you may be able to provide. Regards, -Adam

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  • 'ACT On' Middleware Consolidation and Innovation Program Launch Webcast Thursday June 5, 2014 - 10am BST / 11am CET / 12am EET

    - by Cinzia Mascanzoni
    We are launching a Demand Generation Program under the Oracle 'ACT On' brand to enable you to help your partners and customers benefit from one integrated Middleware stack to better address today's new IT Challenges. We will work with you to drive demand for your partners to deploy consolidated Middleware environments with one integrated red Stack from Database to Middleware solutions running on engineered systems like Oracle Database Appliance or Exalogic. The opportunity for VADs is to: Build on the strength of FMW which has a significant share of the total Oracle revenue in EMEA Sell more FMW licenses to existing customers Add Systems to deals to grow the value Join us on June 5th, 10am BST / 11am CET / 12am EETFor details on how to join, click here

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  • Windows doesn't recognise my USB key anymore (it used to work)

    - by dominicbri7
    I use my friend's USB flash drive (Corsair flash voyager 16gb) to transfer files from my laptop to my desktop computer. However, since a couple of days my laptop stopped recognizing the USB key.. while there is still no problems with all other computers. I use Windows 7 64 bits if that can help. I tried uninstalling the driver, rebooting and all those kind of tricks, but it won't work. When I connect it and open the "My computer" window, I see "Removable Disk (G:)" for a moment, then it disappears... then it reappears again and it keeps doing that periodically. I can't even right click then hit "Properties" because it disappears. As I recall, it DOES work on every other computers, I think it has to do with the driver but what can I do?

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  • Is it possible to boot Ubuntu using the Windows bootloader?

    - by badp
    As noted by many people, Windows 8's UEFI requirements might will won't get in the way of installing Linux (or whatever), as the replacement bootloader will also need to be signed somehow. Some systems All systems will let you disable the signature requirement, but the feature might be hidden to disable or you might not be willing to give up on the benefits of a secure bootloader. Is it necessary to replace the bootloader in the first place? To keep ourselves to software that's gone golden, how can I install Ubuntu 11.04 using Windows 7's own bootloader?

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  • Alternative ways to construct maps

    - by sideways8
    I've searched around and it seems like most people are using tile-based map systems. I suppose this question is more theoretical than practical (I am not very concerned about memory or performance speed), but I want to know: what other ways can a map be created in a game? A map being a graphic representation of terrain that can be navigated, has entrances and exits, and boundares (no-go zones). Besides using text files to store and arrays to load tile data, one idea I had was to store a map entirely as a graphic file and use queries on the pixel colour to determine boundaries (ie, you can only move in a certain direction if the way is bright enough in that direction). What other creative map systems are out there?

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  • What do Embedded Software Developers do on a day to day basis?

    - by afree100
    Edit: I am not asking how to program embedded systems. I am asking how it is done in a practical business setting. I have searched for hours for information on what software developers actually do. More specifically, what coding challenges would one experience daily (e.g. code examples (although obviously not too large), specifics)? I am interested in Linux based embedded systems mainly, but any software development would be helpful (in the C/C++/Assembly areas). Also, regarding this, a distinction between junior, intermediate and senior developers would be helpful. Also, what is the best place to prepare for such things before getting a job for the first time?

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  • What companies do what I'm interested in? [closed]

    - by Alex
    I'm a systems guy. People change their concentrations to avoid taking operating systems, while I took it during my first semester after transferring. I'm taking compilers and networks now, and I think they're awesome. And yet there are so many job postings looking for people to do work in things like web development, and so few postings looking for people to work in kernel hacking or network engineering. What sorts of companies do these things? I'm currently awaiting a contract in the mail for an internship with VMWare, so I'm not out of a job for the summer. Still, I'd like to companies do these things.

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  • Are the results of the system-check taken by "checkbox-gtk" public? Where can I watch them?

    - by oZiRiz
    With Ubuntu there comes a nice possibility to check the compatibility of a new (or even old) system and to send these data to the ubuntu developers. The tool to do this is "checkbox-gtk". I would like to know, whether there is a chance to view these results because it would be nice to know if the future system will work with ubuntu. Yes. I know about the certified hardware list, but there are only a few systems listed and i hope that more people test there systems with checkbox and commit the results.

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  • Is there any way around the field-of-use restrictions in Java?

    - by Muton
    Current field-of-use restrictions defined in "Oracle Binary Code License Agreement for the Java SE Platform Products" prohibit its use in embedded systems. "General Purpose Desktop Computers and Servers" means computers, including desktop and laptop computers, or servers, used for general computing functions under end user control (such as but not specifically limited to email, general purpose Internet browsing, and office suite productivity tools). The use of Software in systems and solutions that provide dedicated functionality (other than as mentioned above) or designed for use in embedded or function-specific software applications... are excluded from this definition and not licensed under this Agreement. Do these restrictions also apply to OpenJDK and other possible implementations? Is the only way to use Java in such an environment to acquire a separate license from Oracle?

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  • CRU??????????????????????????

    - by aiyoku
    ACS T&M ?????(CRU) ?????? ????·??????·?????·????(ACS)???ACS T&M ?????(CRU) ????????????? ???????????????·???????(Premier Support for Systems)???????????????????????????????????????????·?????·??????????????? ????????????????????????????????????? ?????????????????????????·?????????????????????????????????ID??????????????????????????·??????????????? ???????????????????????????????????????????????·??????????????? ??:??????·??????????????????????????????????? (1664356.1)   ????????????????????? ???????????????????????????·????????????????????Oracle Hardware??Systems ????·?????????????????"Delivery Method Chart: Replacement Parts and Installation of Integrated Software Updates" ???????????????? ??????????????????????????????????????????????????????(?????????)?????????????????? ??????????????????????????????? Oracle System Handook ????????? ????Oracle System Handook????????????????????? ??????????? Full Component List ?????????????? Manufacturing Part # ?????????7039990 [C]??????Manufacturing Part #???? [C] ????????????????? [C] ????????????????????????????? ??????????????????????????????????·???????????·???????????????????????????????????????????????????????????????????????   ??????? ????????????????????????????????????????????

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  • wuinstall doesn't work with winrs

    - by wizard
    I've been having issues with psexec so I've been migrating to use winrs (part of the winrm system). It's a very nice remoting tool which is proving to be more reliable then psexec. Wuinstall is used to install available windows updates. The two however don't play well together. I'm working on a verity of windows servers 2003, 2008 and 2008r2. Wuinstall behaves the same across all hosts and behaves as expected if executed locally by the same user. Command: winrs -r:server wuinstall /download Produces WUInstall.exe Version 1.1 Copyright by hs2n Informationstechnologie GmbH 2009 Visit: http://www.xeox.com, http://www.hs2n.at for new versions Searching for updates ... Criteria: IsInstalled=0 and Type='Software' Result Code: Succeeded 7 Updates found, listing all: Security Update for Windows Server 2008 R2 x64 Edition (KB2544893) Security Update for .NET Framework 3.5.1 on Windows 7 and Windows Server 2008 R2 SP1 for x64-based Systems (KB2518869) Security Update for Microsoft .NET Framework 3.5.1 on Windows 7 and Windows S erver 2008 R2 SP1 for x64-based Systems (KB2539635) Security Update for Microsoft .NET Framework 3.5.1 on Windows 7 and Windows S erver 2008 R2 SP1 for x64-based Systems (KB2572077) Security Update for Windows Server 2008 R2 x64 Edition (KB2588516) Security Update for Windows Server 2008 R2 x64 Edition (KB2620704) Security Update for Windows Server 2008 R2 x64 Edition (KB2617657) Downloading updates ... Error occured: CreateUpdateDownloader failed! Result CODE: 0x80070005 Return code: 1 Googling "0x80070005" finds "unspecified error" which isn't helpful. Thoughts? Is there a better way?

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  • How does enterprise failover, such as with google.com, actually work?

    - by Alex Regan
    We have a few fedora systems that are configured for web, FTP, and email services. We'd like to mirror these services, so that we can provide near 100% reliability for our users. I'm a fairly experienced Linux administrator, but don't have much experience with redundant systems. What is the best way to do this? How does google and amazon do it? Google.com resolves to multiple IP addresses, but if my local desktop caches one of the IPs that are unreachable, I'm going to get a failed connection message. How do they prevent that from happening? If one of their servers goes down, how is it automatically redirected to another system, without the end-user ever knowing it? I understand there are failover devices, but they're only for failing over the system itself, not a complete network. Let's say we have the worst-case scenario, such as my primary system becomes inaccessible. What are the fundamental components that are used on Linux systems to provide this capability? I'm looking for concepts, or approaches, not answers like "check out openstack". What are the actual pieces that make up the solution? What has to be done to implement this capability? Hopefully my question is clear. I'd like to know what the pieces are that make up a failover system and what approach is taken by successful organizations that implement it. Thanks again, Alex

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  • To update or to not update?

    - by Massimo
    Since starting working where I am working now, I've been in an endless struggle with my boss and coworkers in regard to updating systems. I of course totally agree that any update (be it firmware, O.S. or application) should not be applied carelessly as soon as it comes out, but I also firmly believe that there should be at least some reason if the vendor released it; and the most common reason is usually fixing some bug... which maybe you're not experiencing now, but you could be experiencing soon if you don't keep up with . This is especially true for security fixes; as an examle, had anyone simply applied a patch that had already been available for months, the infamous SQL Slammer worm would have been harmless. I'm all for testing and evaluating updates before deployng them; but I strongly disagree with the "if it's not broken then don't touch it" approach to systems management, and it genuinely hurts me when I find production Windows 2003 SP1 or ESX 3.5 Update 2 systems, and the only answer I can get is "it's working, we don't want to break it". What do you think about this? What is your policy? And what is your company policy, if it doesn't match your own?

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  • PDFs and Networked Printers

    - by Bart Silverstrim
    Weird issue. We have users printing to networked windows-shared printers (print server Win2003 sp2). Some users have been reporting recently that they can't print PDF documents to particular printers (two example printers are HP 2430 PCL 6 driver and 4250 PCL 6 driver). At first, we found that on many of these systems the "Everyone" object was added to the permissions for the root of the C: volume but had no permissions checked. We added modify privileges to it (these are Deep-Freeze systems, so modifications to these systems that we don't add as administrators won't matter) and they seemed to be able to print. Perhaps Acrobat Reader was writing a temp file for printing where users didn't have permission, we surmised, and made the change and moved on. Yesterday the user called in saying it's not working still. Looked at it; bring up a PDF, click Print and the reader app says that you have to install a printer. Look at the printers folder (Windows XP workstation), and it has printers installed. Print a test page, return to AcroReader, and it will print fine to that printer. The whole time web pages, MS Office documents, etc. print without issue to the same printers. Has anyone seen this issue with Acro Reader 9 and certain network printer drivers or shares involving HP printers? I'd post this to SuperUser but it seems to be associated with a networked printer issue, seems to affect subsets of users but may be more widespread and our users aren't reporting it to us assuming we just know about it, and I've not found rhyme or reason as to why it's affecting just PDF printing and particular printers. The print spoolers are all running on the workstations and print server without errors being logged so far, but I'm going through the logs now to see if I can find anything out of place.

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  • Most transparent way to connect two LANS using a WET610N Wireless Bridge

    - by Spencer Ruport
    I have two wired systems hooked to a Linksys WRT54GL wired/wireless router which is also hooked to my internet. I'll refer to this as LAN1. I have two more systems in another room that are connected wirelessly. Recently I decided I would much rather have another wired LAN in the other room and use a bridge to connect them. This would be LAN2. Prior to hooking up the device I assumed that the ethernet side of the bridge would have a DHCP server so that I could simply hook it up to a switch and I'd be on my way. However that isn't the case which leads me to believe I'll have to add one to LAN2 correct? Or is there some way to have the DHCP from LAN1 also hand out IP addresses to LAN2? If I do need a DHCP device on LAN2 what would be best? Another hardware device or should I just install some DHCP software on one of the systems (since they're both on 24/7 anyway). Any recommendations would be appreciated. :)

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  • DNS Does Not Register at Off-site Locations

    - by Russ Warren
    First of all, let me give you the specifics of our setup: Windows Small Business Server 2008 Domain w/ all applicable updates on the DC The DC does DHCP for the main site The DC does DNS for all sites 3 sites including our headquarters where the DC is located All sites are connected through OpenVPN SSL tunnels terminated by an Untangle box at each site The 2 remote sites us the Untangle box as a DHCP server for their subnet, which assigns the DC as the primary DNS server Collection of Windows XP and Windows 7 workstations connected to the domain Here's the issue: All of the workstations at the main site register with the DNS server on the domain controller fine. As they grab an IP from the DHCP server, it updates the DNS server with the new host record. I have 2 systems (each at different remote sites) that fail to register with the DNS server. I've attempted the following troubleshooting steps: Confirmed the network adapter is using the DC as a DNS server Confirmed 2-way traffic is possible between DC and workstation Verified the "Register with DNS server" setting was checked in the adapter properties Attempted ipconfig /registerdns and received no errors For the time being, I have setup a DHCP reservation for these systems and manually created a host record. This seems to work fine, but I need a solution for any new systems that go out there.

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  • How do I prevent or override a group policy on Windows 7?

    - by Kevin
    A few months ago my company was purchased by a large corporation. We recently switched our network over to the large corporate network which has more restrictions requirements. One of these is the requirement to use a proxy server for Internet traffic. However, some of our internal servers are not recognized by the corporate DNS, so we need to provide the fully qualified domain name. For W7, we make changes to the Internet Properties for IE8 and Chrome to include our domain name as an exception to the proxy server (e.g., *.foobar.com). The problem is that a group policy that does not include our domain name is continually pushed out to my systems throughout the day. This requires me to make the appropriate changes to the Internet Properties several times a day in order to access our internal servers. Is there a way that I can prevent the group policy from being pushed to my systems or detect when the group policy is pushed and override it? I am an administrator on all of my systems. I do have Firefox installed which is not subject to the same group policy push, but I need to have IE8 and Chrome working.

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  • Inter-VLAN Malicious Code Scanning

    - by Jackthedog
    I am trying to find an inbuilt solution on a Cisco Catayst 3750X Switch to scan all traffic routed from one VLAN to another for malicious code. The situation is that we currently have a development environment which is currently being redesigned to upgrade the network infrastructure to use the 3750X switches to manage server and workstation connectivity as well as inter-VLAN routing. We also have another system that is responsible for taking the builds created on the development environment and imaging various HDDs. Because these are two separate systems, we have a requirement in the workplace to anti-virus scan any data transferred between these systems. This is done by copying the data from the originating system to external USB HDD, scanning in a standalone workstation and then copying the data on to the receiving system. As you can imagine this is extremely tedious and impractical most of the time... (I don't make the rules). Anyway, with this redesign going on, we would like to join the imaging system to the network infrastructure of the development system, keeping separation by the use of VLANs and restricting traffic by using ACLs. As we still have the requirement to scan all traffic I would like to configure some sort of malicious code scanning when ever traffic is routed between these VLANs. I am aware I could install a separate in-line IPS/IDS device, however both systems will be using multiple ports on the switch (obviously), and we won't be able to put a device on each port. I would would prefer not to add additional hardware if the 3750x switch is capable of doing the job. Is anyone aware of any Cisco solution that I could use here, that ideally can be incorporated into the 3750x switch? Thanks in advance.

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  • Cisco Multi-DMZ firewall

    - by BParker
    I need to find a firewall that will give me 1 LAN port, and 5-7 DMZ ports. I have a requirement to replace some FreeBSD systems that are used to run some testing equipment. It is essential that the DMZ ports cannot communicate with each other, but the LAN port can communicate with everyone. That way a user on the LAN can connect to the test systems, but the test systems are isolated entirely and cannot interfere with each other. One of the DMZ's will be connected to a VMWare ESXi server, one to a standard server, and the rest to various types of equipment. The lan port will be connected to the corporate LAN switch. Sorry if i am a little vague, I am just trying to work all this out myself! Currently we have a FreeBSD configured, but the quad port NIC's are pretty expensive, and the PC itself is old, so i would prefer to replace it with a dedicate piece of kit which can do the same job, but more reliably! These test rigs are used all over the place, and get moved quite often, so i am aiming for Cisco kit for ease of configuration and reliability of the hardware itself. Thanks

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  • Formula to calculate probability of unrecoverable read error during RAID rebuild

    - by OlafM
    I need to compare the reliability of different RAID systems with either consumer or enterprise drives. The formula to have the probability of success of a rebuild, ignoring mechanical problems, is simple: error_probability = 1 - (1-per_bit_error_rate)^bit_read and with 3 TB drives I get 38% probability to experience an URE (unrecoverable read error) for a 2+1 disks RAID5 (4.7% for enterprise drives) 21% for a RAID1 (2.4% for enterprise drives) 51% probability of error during recovery for the 3+1 RAID5 often used by users of SOHO products like Synologys. Most people don't know about this. Calculating the error for single disk tolerance is easy, my question concerns systems tolerant to multiple disks failures (RAID6/Z2, RAIDZ3 and RAID1 with multiple disks). If only the first disk is used for rebuild and the second one is read again from the beginning in case or an URE, then the error probability is the one calculated above squared (14.5% for consumer RAID5 2+1, 4.5% for consumer RAID1 1+2). However, I suppose (at least in ZFS that has full checksums!) that the second parity/available disk is read only where needed, meaning that only few sectors are needed: how many UREs can possibly happen in the first disk? not many, otherwise the error probability for single-disk tolerance systems would skyrocket even more than I calculated. If I'm correct, a second parity disk would practically lower the risk to extremely low values. Am I correct?

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