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  • Standalone server setup for compute capacity

    - by mikera
    I'm developing an application for my company that will require a lot of compute capacity (running some very big mathematical calculations), and looking for some form of server setup to do this. For various reasons, we want to run this on-site in our office rather than hosting it externally. It's been a while since I last had to set up my own servers so I thought I would tap into the collective wisdom of serverfault! My broad requirements are: Budget $30-50k, with an aim to get as much compute capacity as possible for that budget 64-bit servers suitable to run Ubuntu Linux + Java Some relatively standalone rack that can be installed in secure office space Fast/low latency network connections between the servers, but don't really care about connectivity to the outside world Storage capacity shared between the servers - they don't necessarily need their own storage providing they can be booted from a common image Downtime can be tolerated (since the calculations are run in batch mode) The software itself is fault-tolerant, so there is no need for extra resiliency in the server setup (cheap replaceable commodity parts will be fine in general) Given these requirements what kind of setup would you recommend and why?

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  • How to check use of userva boot option on Win 2K3 server

    - by Tim Sylvester
    I have some 32-bit Win2K3 servers running an application that fails now and then apparently due to heap fragmentation. (Process virtual bytes grows, private bytes does not) I do not have access to the source code or build process of this application. I have modified the boot.ini file on one of these servers to include /userva=2560, half way between the normal mode of operation and the /3GB option. Normally it takes weeks to reach the point of failure, but I'd like to see right away whether this has actually had any effect. As I understand it, this option limits the kernel to the remaining address space (1536MB instead of 2048), but does not necessarily give an application the extra address space, depending on the flags in the application's PE header. How can I determine whether the O/S is allowing a particular application, running in production, to access address space above 2GB? Additionally, what's the best way to monitor the system to ensure that the kernel is not starved for address space, and more generally how should I go about finding the optimal value for this setting?

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  • Canon HV20 recognized, but no drivers in Windows 7 x64

    - by Tuminoid
    My Canon HV20 camcorder is properly recognized when connected via Firewire to Windows 7 x64, but no drivers are installed for it. Windows or I cannot locate any drivers for it as, but it should be working off-the-shelf. I googled a lot, and found instructions to set IEEE 1394 host to legacy mode via Device Manager, but Windows doesn't offer me the legacy option at all. If I check the properties of Canon&HV20 device in Other devices section it says The drivers for this device are not installed. (Code 28) There is no driver selected for the device information set or element. It used to work just fine on my previous installation of Vista x64 and same hardware :/

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  • Python/Lesta.A worm

    - by Hanks
    My Nod32 have been catching something that is apparently identified as Python/Lesta.A worm. No matter how many times I tell Nod32 to delete and quarantine the file, it always re-appear, the situation will repeat about 3-4 times a day. This thing has been creating a folder called "pamela" in one of my drives, it sometimes also creates a "xxx.folder" file, which Nod32 identifies as "Exploit/CodeBase virus". I have Googled, and done pretty much everything related to this: a full scan in safe mode with no networking turned on, and also ran Ad-Aware, SpyBot, SpyHunter, ComboFix and cleaned the registry. Any idea how I can completely get rid of this annoying virus/worm?

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  • Restoring Mac-bootcamp-windows-partition image to Windows machine

    - by jpwagner
    Hi, I'm running Windows XP sp3 on my mac using bootcamp. Objective: I'd like to move this partition to a windows machine. This is what I tried: 1. create image using winclone 2. restore drive to disk partition on windows machine using paragon 3. reboot from new partition Results: it attempts to boot in XP (windows flag and progress bar load screen) but then gives me the old BSOD. safe mode just hangs while loading. (I then uninstalled KB977165 on a hunch, but that did nothing to help the issue.) Any ideas, advice, etc would be greatly appreciated. Thanks!

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  • Can I ping via an arbitrary interface of a DD-WRT system? [migrated]

    - by bytebuster
    There's a Linksys WRT54GL router with DD-WRT firmware (v23SP2). The network has a simple dual-WAN configuration (standby mode, switching by a script): ~ # ip route 192.168.3.0/24 dev br0 proto kernel scope link src 192.168.3.1 192.168.2.0/24 dev vlan2 proto kernel scope link src 192.168.2.2 192.168.1.0/24 dev vlan1 proto kernel scope link src 192.168.1.67 127.0.0.0/8 dev lo scope link default via 192.168.2.1 dev vlan2 I'm trying to ping a certain server arbitrary via vlan1 or vlan2. What I tried, as suggested here: ping -I vlan2 <address> ping 192.168.2.1 <address> In both cases ping simply exits with no error messages. Also, ping ignores many other parameters, again, by exiting silently. I failed to find any references that DD-WRT has a limited version of ping whatsoever. I also don't think it can be a permissions issue as mentioned here since the only user with DD-WRT is root. What's wrong?

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  • Network Block Device (NBD) clients for Windows or similar solutions

    - by przemoc
    Are there any NBD clients for Windows? Strangely, I cannot find any, or I am searching for them in a wrong way. Such client should be possibly a driver with front-end tool (may be a command-line one) allowing to create virtual drives and associate them with given hosts (or simply localhost) and ports where NBD servers are listening. From user perspective virtual drive should be close to what physical drive is, so it should be accessible as something like \\.\PhysicalDriveX (maybe \\.\VirtualDriveX?), be visible in Disk Management (diskmgmt.msc) and mountvol tools at least. (The only thing I found remotely close to NBD on Windows is ImDisk's proxy mode and companion tool devio, but AFAIK ImDisk only works at partition level (so no virtual drive) and devio uses different protocol.) Secondary question is: Are there any (preferably simple) Windows-specific solutions allowing creation of virtual drive delegating read/write request to user-space via some explicit way (like via TCP, IPC, DLL implementing given API, etc.)?

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  • Manual TRIM Windows 7 on OCZ VERTEX 2 SATA II 2.5" SSD

    - by INTPnerd
    I have an OCZ VERTEX 2 SATA II 2.5" SSD with Windows 7 Professional installed on it. I am pretty sure TRIM is not working because my motherboard is the Asus M2N-SLI (not the Deluxe model) which does not support AHCI mode for the drive. Is there a utility that is compatible with this drive that I could possibly run once a day that would do something similar to a manual TRIM in order to keep the drive performance up? I could not find one specifically for this drive on the OCZ website. I did find a User-Initiated Garbage Collection wiper tool, but it is for a Vertex drive not Vertex 2. I tried to run it, but it said that wiper could not be run for all the drives on this system.

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  • Can't see progress of rolling back SPID with KILL WITH STATUSONLY

    - by BradC
    I have a SPID on SQL 2005 that shows in Activity Monitor as "ROLLBACK" mode (because a transaction log filled up, not because it was manually killed). I tried to see how much time it has left to roll back with a KILL 115 WITH STATUSONLY but it just said "Status report cannot be obtained. Rollback operation for Process ID 115 is not in progress." Can I safely issue a "KILL 115" so that I can see the rollback status? Does this actually do anything on a spid currently in rollback?

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  • Kill xserver from command line (init 3/5 does not work)

    - by Richard Martinez
    I'm running Linux Mint 10, although I've had this same issue with other variants of Linux. I've been told/found while researching that if the X server hangs or otherwise errors, one can drop to a root prompt, usually at another tty, and execute init 3 (to drop to single user mode) and then init 5 to return to the default, graphical session. Needless to say, I've tried this before in multiple configurations on multiple machines to no avail. The only feedback I receive form executing those two commands is a listing of VMWare services (from a kernel module) that are stopped and then restarted. Note: If I run startx (either before or after init 3), then I am told that the xserver is still running and that I should remove /tmp/.X0-lock. Having tried that, it removes that error message, but claims that the xserver cannot be attached as another instance is running. How do I kill the xserver completely? Can I killall some process name?

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  • How to add a service to the S runlevel in Debian?

    - by MasterM
    I have the following script (what it does exactly is not important): #!/bin/sh -e ### BEGIN INIT INFO # Provides: watchdog_early # Required-Start: udev # Required-Stop: # Default-Start: S # Default-Stop: # X-Interactive: true # Short-Description: Start watchdog early. ### END INIT INFO # Do stuff here... I insert it into the S runlevel by invoking: insserv watchdog_early The aproriate link is created in /etc/rcS.d: S04watchdog_early -> ../init.d/watchdog_early and /etc/init.d/watchdog_early is executable (has mode 755). Despite all this, it is NOT being run at boot. Why?

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  • Can I restore Windows 8/install Windows 7 from BIOS?

    - by Tom
    I recently got an ASUS K55A series laptop with Windows 8 on it, and have been trying to load Windows 7 on it for days to no avail, and recently I discovered how to get my Windows 7 install DVD to boot from the BIOS, but I deleted all of my Windows 8 system information from both partitions of my HDD and Windows 7 setup says it cannot install on the disc because of a partition format issue. I did not delete the recovery HDD partition for Windows 8, but I can't get the HDD to show up in my boot menu in BIOS, and none of the F keys work to get to recovery mode (only DEL and F2 work to get me into BIOS)

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  • Block ip for long time

    - by Tiziano Dan
    This question is about a iptables, I wanna to know how can I block these ip for 1hour and not only a little time.. because they make to many sql requests, I'm using it for block but it's not enough because there's anyway 100k ip who attack then too much requests for sql server. iptables -N SYN-LIMIT iptables -A SYN-LIMIT -m hashlimit --hashlimit 8/second --hashlimit-mode srcip --hashlimit-name SYN-LIMIT -j RETURN iptables -A SYN-LIMIT -j DROP iptables -I INPUT -p tcp --dport 80 --syn -j SYN-LIMIT iptables -I INPUT -p tcp --dport 80 -m connlimit --connlimit-above 6 -j REJECT --reject-with tcp-reset How can I make the same but block IP for long time ? (Not manually !)

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  • How computers display raw, low-level text and graphics

    - by panic
    My ever-growing interest in computers is making me ask deeper questions, that we don't seem to have to ask anymore. Our computers, at boot, as far as I understand it, are in text mode, in which a character can be displayed using the software interrupt 0x10 when AH=0x0e. We've all seen the famous booting font that always looks the same, regardless of what computer is booting. So, how on earth do computers output graphics at the lowest level, say, below the OS? And also, surely graphics aren't outputted a pixel at a time using software interrupts, as that sounds very slow? Is there a standard that defines basic outputting of vertices, polygons, fonts, etc. (below OpenGL for example, which OpenGL might use)? What makes me ask is why OS' can often be fine without official drivers installed; how do they do that? Apologies if my assumptions are incorrect. I would be very grateful for elaboration on these topics!

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  • Is there an encrypted write-only file system for Linux?

    - by Grumbel
    I am searching for an encrypted file system for Linux that can be mounted in a write-only mode, by that I mean you should be able to write/append files, but not be able to read the files you have written. Access to the files should only be given when the filesystem is mounted via a password. The purpose of this is to write log files and such, without having the log files themselves be accessible. Does such a thing exist on Linux? Or if not, what would be the best alternative to create encrypted log files? My current workaround consists of simply piping the data through gpg --encrypt, which works, but is very cumbersome, as you can't get easy access to the file system as a whole, you have to pipe each file through gpg --decrypt manually.

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  • Troubleshooting an iMac

    - by Matthew
    What can I do to fix my iMac? When I start it up, it just loads forever (never getting to the Desktop). The mouse will appear then disappear, then the loading bar will sometimes appear and then disappear and it just goes in circles forever. If I start up in safe mode (by holding shift), it gets to the login window. However, if I attempt to log in the login window disappears and reappears asking for my password again. What can I do to troubleshoot this?

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  • Video problem with Windows 7 Games

    - by Jordan 1GT
    I have a Dell xps M1330 which originally ran Vista, but I upgraded to Windows 7. When I try to run a Win 7 game like spider solitaire I receive the following message: "The game is running in software rendering mode. Hardware acceleration is either disabled or not supported by your video card driver which could slow down game performance. Make sure you have the latest video card driver installed and that hardware acceleration is turned on." I confirmed that hardware acceleration is turned on. When I go to Dell's site, I'm told there is no later video driver. When I run the game it runs very choppy. I wouldn't care, but I loaded a .pptx file which is doing strange things in normal view and I suspect may be related to the same video problem. Any ideas?

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  • How do you know where macports installs python packages to?

    - by xmaslist
    I am running macports to install scipy and such on OS X leopard with python 2.7. The install runs successfully, but running python and trying to import the packages I've installed, they're not found. What I'm running is: sudo python_select python27 sudo port install py27-wxpython py27-numpy py27-matplotlib sudo port install py27-scipy py27-ipython Opening up python in interactive mode (it is the correct version of python), I type 'import scipy' and get a module not found error. What gives? How can I find out where it is installing the packages to instead?

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  • Establish direct cable connection between Windows 8 PCs in home network

    - by Marie. P.
    I'm running two PCs, a desktop and a laptop with Windows 8 Release Preview ("Build 8400"). They are connected to the same router in infrastructure mode, thereby having wireless internet. Due to often file synchronization between the machines I want to establish a cable connection that allows direct file transfer, without needing to use the wireless. When I plug in the cable (normal, not cross-over), I see in "Control Panel\Network and Internet\Network Connections": "Ethernet - unidentified Network" on both PCs. Transferring a file between both still only uses the WiFi via the Router. I noticed that when turning off the wifi on one PC, I can set up a shared internet connection that will work via Ethernet-cable, but since sometimes only one PC runs, sometimes the other one, I do not want to have the internet of one machine to be dependent on the other one being switched on. I do not have a crossover-cable, but since I did connect the PCs already successfully (just without both being on the internet), I'm sure that this should also work with a normal ethernet cable.

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  • Screenflick Audio option in MacBook Pro

    - by John
    When after I shut down my MacBook Pro by holding the power button for a few sec, (which I found is bad for the computer, so I will not do anymore) I found that my speaker doesn't play until I plug in and out earphone into the machine. When my speaker is not working like this, and when I am on a random webcam chatting site like chatroulette.com, they can hear the music playing on my iTunes when I choose Screenflick Audio option in the Mic setting. But when the Speaker is working back again, they don't hear the music playing even when I do Screenflick Audio mode. How can I make it work? Also, how do you make the chatting partner hear my music playing on my computer while I talk to them (not via my speaker, since it's bad quality).

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  • How do I make YouTube videos fill up an entire screen when using dual monitors?

    - by Jephir
    I am using a dual monitor setup on Ubuntu 9.10 using the TwinView configuration in NIVIDA X Server Settings. My total resolution is 2960x1050 pixels, and my individual monitors are 1680x1050 (primary) and 1280x1024 (secondary). When going into fullscreen mode on any video on YouTube, I only see a cropped version of the video on my primary display as seen below. This does not occur on any other video sharing website - they properly make the video to fill the entire screen on my primary monitor. To my knowledge this problem only happens on YouTube.

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  • Prevent URLs from specific domains from being saved in Firefox history

    - by noam
    I want to prevent or block URLs of specific domains from being saved or shown in my history. I want to be able to go to these certain websites normally, just not have them saved and not have to use private or incognito mode. For instance, I don't want any of Google's search result pages to be saved in my history since then when I use the awesomebar I get a lot of Google's search results, which are of no use to me. Of course I can keep on deleting them, but I would like a way to specify that any URL starting with www.google.com shouldn't be saved.

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  • Problem with running a program from flashdrive

    - by rajivpradeep
    I have a USB drive with two partitions in it, one hidden and one normal. I have an application which swaps the memory and runs the flash application in hidden zone. The problem is that the application works fine on Windows 7 and when run on Win XP, it swaps the partitions but doesn't run the flash applications but just keeps running in the background. I can see it in task manager. But, when I copy the application to desktop and run, it runs with no glitch. I was facing the same problem on Win 7 too, but it was running as required when I ran it using "Run in XP mode" and then I applied a SHIM and is running since then as required. The application is built using VC++ 2008. What might be the problem?

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  • Booting ubuntu from usb hdd: GRUB menu not shown

    - by emanemos
    Hello, could anyone help me to boot ubuntu-9.04 from usb hard disk? This disk contains /boot primary partition. During ubuntu installation I used "Advanced" button and asked to install GRUB to the /boot partition. Later I checked whether GRUB files are really present in this partition. They are. However, I get stuck while trying to boot. The boot menu ("ubuntu generic version", "ubuntu recovery mode", etc...) is not shown. Instead I am thrown to GRUB minimal bash-like version. I feel at a loss and have no idea why I am pointed to this minimal version. Can anybody prompt me what to do?

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  • Xen DomU does not have network connectivity

    - by Prakashkumar Thiagarajan
    I am trying to install Xen on my Fedora box. Dom0 image has network connectivity. But when I try to create a DomU, it does not have network connectivity. I want to be able to run in bridged mode. I have the /etc/xend/xend-config.sxp file accordingly. My config file looks like kernel = "/boot/vmlinuz-2.6.18-xenU" memory = 64 name = "clientA" vif = ['bridge=xenbr0,mac=12.34.56.78.9A.BC'] root = "/dev/sda1 ro" ramdisk = "/boot/initrd-linux.img" extra = "ro selinux=0.3 initcall_debug" features = 'auto_translated_physmap' Am I missing something ?

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