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• What is the value/cost of enabling "spread spectrum clocking" on my hard drives?

  - by Stu Thompson

  I'm building up a biggish NAS box (10x WD RE4 2TB SATA RAID10) and ran into some problems. During the course of my research, debugging, investigations, etc, I discovered a jumper on the physical drives labeled "spread spectrum clocking". After some googling about this on teh internets, it seems to be a feature that some suggest (without reference or explanation) enabling in 'a storage configuration' that makes the drive less sussesptable to EMI. But why? I've got three core questions: Why is this feature not enabled by default? What are the actual benefits? Are there any costs?

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• How to decide the optimal number of ruby thin/mongrel instances for a server, number of cores?

  - by Amala

  We are trying to deploy mongrel instances on a machine. What is the optimal number of mongrel instances for a server? Since an instance can handle concurrent connections, I do not see any benefit in starting more than 1 per core. Any more than that and the threads will just fight for CPU. Our predecessors have assigned 10 instances for 4 cores, but I think it will just cause CPU contention. Any definitive answers / opinions? I have seen this question: How many mongrel instances? But it is really not specific enough.

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• ubuntu to ubuntu backup in internal network

  - by amirash

  hey, i got my development "home" server witch is ubuntu 10, i brought today a computer in order to make a backup to this computer (the development server does also to him self backups every day but im paranoaid so i want to have two backups just in case on diffrent computers) what is the best way to backup the system core of the development server (like norton ghost) & do a full & incrmnt backup of him to the new computer that ive brought? rsync? rdiff? scp? clonezilla?

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• How to Configure Different Gateways for Different VLANs

  - by Bryan

  I have around 10 VLANs, and two different internet gateways. I want traffic on some VLANs to use one gateway, and traffic on other VLANs to use another gateway. (e.g. I wish to route server traffic via one gateway and desktop internet traffic down another). Is it possible to configure different default routes for different VLANs on a Dell 6224 switch? Or is their a better way of doing what I'm trying to achieve? The core switch I am using is a Dell PowerConnect 6224 switch. Currently I'm using: ip route 0.0.0.0 0.0.0.0 10.58.3.16 which creates the default gateway for all VLANs. I did consider adding multiple routes with equal metric, and setting ACLs between the VLANs to deny access to the 'wrong' gateway, but that idea just doesn't feel right to me.

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• Poor CPU usage under Ubuntu

  - by remek

  Hello, I just upgraded from Ubuntu 9.10 to Ubuntu 10.04 and I am now experiencing a strange problem. My computer has a quad-core processor, and when I am running several processes simultaneously, none of the cores is fully used. Before the upgrade, when I was running 4 processes, each of them was using 100% CPU (I could see that with the 'top' command). But now, CPU usage oscillates and is always pretty low. Has anybody an idea about this problem? Is it due to Ubuntu or to the program I am running? Thank you very much in advance for your help! Best, remek

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• 250k connections for comet with node.js

  - by Nenad

  How to implement node.js to be able to handle 250k connections as comet server (client side we use socket.io)? Would the use of nginx as proxy/loadbalancer be the right solution? Or will HA-Proxy be the better way? Has anyone real world experience with 100k+ connections and can share his setup? Would a setup like this be the right one (Quad core CPU per server - start 4 Instances of node.js per Server?): nginx (as proxy / load balancing server) / | \ / | \ / | \ / | \ node server #1 node server #2 node server #3 4 instances 4 instances 4 instances

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• How do you passthrough native SATA drives to a guest on ESXi?

  - by John

  I have ESXi 4.0 running on an Intel DX58S0 Mothboardboard with an Intel Core i7 930 processor. VT-d is also enabled. I have three drives in the system, drive 0 is used for ESXi. Drive 1 and 2 contain data from an older machine and show up under the "Storage Adapters" section in configuration. I would like to allow a guest machine to access the data on these drives (as nativly as possible). I have enabled passthrough of the motherboard's built in SATA controller (Intel/Marvell 88SE6121 ). This controller shows up in my guest OS, but the guest shows no drives aside from the normal virtual drive. I have tried a Linux guest and Windows7. I have also configured the host machine to try IDE/RAID/ACHI modes for the SATA controller. Any ideas how I can configure one of my guests to get at the raw data on these drives?

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• How to limit my CPU power programmatically on Windows 7?

  - by Ivan

  Whenever I run a CPU-heavy activity (like compressing a big set of files into an archive for example) my CPU switches to its full throttle (maximum frequency) and shuts down of overheat in less than a minute. Instead, I would like it to keep slowed-down slightly to do the task a bit slower but be able to reach the finish. At the same time I don't want to dim my screen brightness or adjust anything else what standard Windows power-saving system does. So how do I actually set a cap to limit my CPU power? The CPU is Core 2 Duo T7250, the OS is Windows 7 32-bit, there seem to be no BIOS settings or jumpers available to configure the frequencies.

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• Time randomly changing itself, internet randomly dying

  - by Vee

  Operating System MS Windows 8 Enterprise 64-bit CPU Intel Core i7 2700K @ 3.50GHz 45 °C Sandy Bridge 32nm Technology RAM 8,00 GB Dual-Channel DDR3 @ 800MHz (8-8-8-24) Motherboard ASRock Z77 Extreme4-M (CPUSocket) 40 °C Graphics SMXL2270HD (1920x1080@60Hz) M2094D-PZ (1680x1050@60Hz) 896MB GeForce GTX 275 (CardExpert Technology) 57 °C Hard Drives 466GB FUJITSU MAXTOR STM3500320AS (SATA) 39 °C Optical Drives ASUS DRW-2014L1T Audio High Definition Audio Device Hello everyone, I installed Windows 8 RTM a few weeks ago. It's not my first time installing it, but it's the first time having two annoying problems: 1) Randomly, the system clock changes time all by itself - to fix it I have to open the time window and sync it with the internet. 2) Randomly, internet connection stops working - to fix I have to run troubleshooting. Windows will find a problem with IP on the "Ethernet" connection and fix it. 3) In rare occasions, my PC freezes and I need to restart it (a BSOD once happened, but after that only freezes) How can I permanently solve these problems? This is what I've already tried: Reset Virus scan Stop/reset the Windows Time service Disable/re-enable Windows Time automatic internet sync Change time from BIOS Change motherboard battery

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• Why does my CPU Usage reach 100% too often?

  - by deathlock

  I'm using a dual-core processor and often see my CPU usage reaches 100%. I realize this may happen if I'm running too much applications, so when I know the computer starts to run slowly, I start to close my applications. I usually run 4-5 applications simultaneously. Usually those are: web browser (Google Chrome), Adobe Photoshop, Notepad++, XAMPP, and Windows Task Manager. Usually I close tabs in my Chrome first, because I often browse the net with about 20 tabs/4 windows open, so I presume that would take much memory (bad habit, I know). But even after closing Chrome's tabs or closing other applications, my CPU Usage often stays at high percentage - 72% at best, 100% at worst. I check the Processes tab on Windows Task Manager and usually found the System, System Idle Process, or services.exe taking the highest CPU process (could reach 60). Why is this happening? And is there any solution? EDIT I have T2250 @ 1,73 Ghz and 2.5 GB RAM

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• How to understand cpu family/model/stepping fields in /proc/cpuinfo [closed]

  - by Victor Sorokin

  I have following in cpuinfo: processor : 0 vendor_id : AuthenticAMD cpu family : 15 model : 107 model name : AMD Athlon(tm) 64 X2 Dual Core Processor 5600+ stepping : 2 According to Wikipedia page there are two kinds of 5600+ -- one of 90nm technology, another of 65nm. How can I understand which one I have? There seem to be no direct correspondence between contents of cpuinfo and info on Wikipedia page. AMD site seems to use some other naming scheme for processors too. How can I map values of family, model and stepping from cpuinfo to the data available on Wikipedia/AMD?

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• Is Windows 8 Pro usable without activation?

  - by DzinX

  There seems to be little information about the way activation system works in Windows 8, especially for consumer versions of Windows (Core/Pro, not Enterprise). I already know that Microsoft now requires you to enter a key before even starting the installation process, and that it tries to connect to the Internet and activate this key as soon as possible. Sometimes, though, you don't have Internet connection when installing Windows 8. What then? Can you install Windows? Can you use it? What are the limitations? For how long can you keep your copy of Windows usable without activation?

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• Another "Trouble copying music files from HD to 16GB thumb drive"

  - by Ron

  I have a brand new HP Quad Core - 6GB Ram - running 64-bit Windows 7. Running Norton Internet 2010. I try copying music files from HD to 16 GB thumbdrive and get blue screen after a few files have transfered over to thumbdrive. Computer blinks once and boom - blue screen and then reboots. This is really aggravating. I stopped anti-virus, pulled other USB attached devices - still does same thing. Any solutions out there?

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• Xnest from Mac OSX to HP UX

  - by Burbas

  Hi, I'm trying to connect to my HP/UX machine from Mac OS X using Xnest. The problem is that I can not get the keyboard to work. I can see the login-prompt, but unable to type in my username. The connection is done by: Xnest :1 -query 192.168.0.193 -geometry 1280x1024 and it gives me some errors: (EE) AIGLX error: dlopen of /usr/X11/lib/dri/swrast_dri.so failed (dlopen(/usr/X11/lib/dri/swrast_dri.so, 5): image not found) (EE) GLX: could not load software renderer (EE) XKB: Couldn't open rules file /usr/X11/share/X11/xkb/rules/base (EE) XKB: No components provided for device Virtual core keyboard Couldn't get keyboard. I hope there is someone here who might have the answer :-).

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• Testing a Virtualisation of a Debian Server (vmWare vSphere probably)

  - by xyza

  I'm soon getting access to a powerful root-server (quad-core, 16gb ram, 1gbit connection) where gameservers (like minecraft,counterstrike etc.) for different customers should be setup. My plan is to use programs such as vmWare vSphere to create some virtual machines for each customer. Inside such a virtual machine I'll setup the gameserver and maybe some kind of ftp server when its needed. Now that I'm kinda new to virtualisation of servers I want to test this local on my Desktop Computer. Is it possible to create a virtual machine of debian using vmWare Player on my Windows desktop computer and then install vmware vSphere in this VM to create multiple VM's inside that VM ? Or do I really need to install Debian on my desktop computer. (I want to use the time during installations etc. to work a bit at my windows installation) Some tips on virtualising debian servers are also appreciated :)

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• Hyper-V and host-installed hardware devices: can guest VMs access?

  - by gravyface

  Have a couple of servers I'd like to setup as Hyper-V Servers, with a couple of Windows 2008 Standard VMs. On the host, we have a few hardware devices we'd like to be accessible to the guest; I'm not sure if these are supported via a raw "pass-thru" on Hyper-V (which I don't have alot of experience with) if the same drivers are installed on the guest. Hardware in question is a Brooktrout fax card, a SCSI adapter for the tape drive, and a 9-pin serial connected to one of the core firewalls for management.

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• NVIDIA Driver Crashing on Custom-Built Windows 7 PC

  - by srunni

  I've got a custom-built PC with these specs: Fractal Design Define R3 ASUS P8Z77-V motherboard Intel Core i7-2700k with Thermalright HR-02 Macho Cooler NVIDIA GeForce GTX 560 with Arctic Cooling Accelero Twin Turbo II Cooler Crucial M4 128 GB SSD 1 TB Hitachi HDD G.SKILL Ares Series 2x8 GB RAM (x2) SeaSonic 520W PSU Windows 7 Ultimate SP1 (x64) NVIDIA driver version 301.42 Upon building the PC, I overclocked the CPU (but never the GPU), and there were no problems for 1-2 months. Then I started getting crashes with this error when doing anything that's computationally or graphically intensive: I un-overclocked the CPU, but that hasn't fixed anything. This is what the inside of my case looks like: I'd appreciate any guidance on resolving this problem. I did get some of the thermal paste on the graphics card when installing the aftermarket cooler, but there were no issues for a month or two. Update I did a clean install and the issue persisted - looks like it's a hardware issue. I will try removing/cleaning/reseating all the parts.

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• Facing gestures in Linux mint Chrome Browser

  - by aravind.udayashankara

  I am using Linux mint OS since an Year , I use to consistently download updates and install , I use chrome as a default browser , when ever I open youtube and watch some video , I listen to some gestures in sound ( say repeated lyrics of song ) while it is playing , In firefox it is working fine . What is the problem am I missing any plugin , AFAIK Chrome doesn't need a flash player plug in , It has a built in flash player . IS that the problem ? And also previously I was not facing this , recently I started using Cinimon UI centOS after this all these kind of problems started MY hard ware is 64 bit intel core i3 and also I have installed linux mint 64 bit Please let me know what is the problem and how to fix this . Thanks in advance for responding to this post

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• Windows 2012 - WDS unattend Partition

  - by joe

  I'm trying to install Windows 2012 via Windows 2012 WDS. The installer displays the following error message: the partition selected for the installation (1) does not exist on disk 0. Make sure the unattend answer file's imageselection \installimage setting references a valid partition on this computer, and then restart the installation. the unattend file (created by the "Create Client Unattend" dialog) <unattend xmlns="urn:schemas-microsoft-com:unattend"> <settings pass="windowsPE"> <component name="Microsoft-Windows-Setup" publicKeyToken="31bf3856ad364e35" language="neutral" versionScope="nonSxS" processorArchitecture="x86"> <WindowsDeploymentServices> <Login> <WillShowUI>OnError</WillShowUI> <Credentials> <Username>administrator</Username> <Domain>test</Domain> <Password>xxxx</Password> </Credentials> </Login> <WillWipeDisk>true</WillWipeDisk> <DiskConfiguration> <WillShowUI>OnError</WillShowUI> <Disk> <DiskID>0</DiskID> <WillWipeDisk>true</WillWipeDisk> <CreatePartitions> <CreatePartition> <Order>1</Order> <Type>Primary</Type> <Extend>true</Extend> </CreatePartition> </CreatePartitions> </Disk> </DiskConfiguration> <ImageSelection> <WillShowUI>OnError</WillShowUI> <InstallImage> <ImageGroup>ImageGroup1</ImageGroup> <ImageName>Windows Server 2012 SERVERDATACENTER</ImageName> <Filename>install-(4).wim</Filename> </InstallImage> <InstallTo> <DiskID>0</DiskID> <PartitionID>1</PartitionID> </InstallTo> </ImageSelection> </WindowsDeploymentServices> </component> <component name="Microsoft-Windows-International-Core-WinPE" publicKeyToken="31bf3856ad364e35" language="neutral" versionScope="nonSxS" processorArchitecture="x86"> <SetupUILanguage> <UILanguage>en-US</UILanguage> </SetupUILanguage> <InputLocale>en-US</InputLocale> <SystemLocale>en-US</SystemLocale> <UILanguage>en-US</UILanguage> <UserLocale>en-US</UserLocale> </component> <component name="Microsoft-Windows-Setup" publicKeyToken="31bf3856ad364e35" language="neutral" versionScope="nonSxS" processorArchitecture="amd64"> <WindowsDeploymentServices> <Login> <WillShowUI>OnError</WillShowUI> <Credentials> <Username>administrator</Username> <Domain>test</Domain> <Password>xxxxx</Password> </Credentials> </Login> <ImageSelection> <WillShowUI>OnError</WillShowUI> <InstallImage> <ImageGroup>ImageGroup1</ImageGroup> <ImageName>Windows Server 2012 SERVERDATACENTER</ImageName> <Filename>install-(4).wim</Filename> </InstallImage> <InstallTo> <DiskID>0</DiskID> <PartitionID>1</PartitionID> </InstallTo> </ImageSelection> </WindowsDeploymentServices> </component> <component name="Microsoft-Windows-International-Core-WinPE" publicKeyToken="31bf3856ad364e35" language="neutral" versionScope="nonSxS" processorArchitecture="amd64"> <SetupUILanguage> <UILanguage>en-US</UILanguage> </SetupUILanguage> <InputLocale>en-US</InputLocale> <SystemLocale>en-US</SystemLocale> <UILanguage>en-US</UILanguage> <UserLocale>en-US</UserLocale> </component> </settings> </unattend> Any idea why it is not working? thanks

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• smartOS HPC config suggestion

  - by Andrew B.

  I'm configuring a brand new HPC server and am interested in using SmartOS because of it's virtualization control and zfs features. Does this configuration make sense for a SmartOS HPC, or would you recommend an alternative? System Specs: 2x 8-core xeon 384 GB RAM 30 TB HDs with 2x512GB SSDs Uses: - zfs for serving data to different vms, and over the network; 1 SSD for L2ARC and 1 for ZIL - typically 1-2 ubuntu instances running R and custom C/C++ code My biggest concerns as a newbie to SmartOS and ZFS are: (1) will I get near-metal performance from ubuntu running on SmartOS if it is the only active vm? (2) how do I serve data from the global zfs pool to the containers and other network devices?

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• Getting BootMgr not found errors repeatedly on Win7 x64

  - by abszero

  So here is the basic configuration of the box: Primary RAID 1 (Mirror, Bootable): 2x 300GB WD SATA drives AMD Phenom Quad Core x64 @2.2 ASUS M3N78 Pro Board 4GB RAM Win 7 Ultimate Additionally, this box is a Host OS for several CentOS Boxes via VirtualBox. The box runs like a champ but, for whatever reason, everytime I restart the machine I get a BootMgr not found error when the box tries to boot. I pop in my Win DVD, select 'Repair Windows' then 'Fix Start Up Problems' and everything works fine...once. When I restart the box again I have to go back through this process. Any ideas on what is going on?

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• nagiosgraph new services not showing

  - by Eleven-Two

  I am using Nagios Core with Nagiosgraph and had only enabled graphing for cpu usage for a while. This worked fine, but now i wanted to add some more services (for example memory usage). The new services are not working (no rrd data is generated). The Nagiosgraph site only says "no data available" and I get no error in apache log, nagiosgraph.log or nagiosgraph-cgi.log. The new services are standard services (nsclient++ MEMUSE for example) and of course they are included in the map file. If I execute the checks manually, it shows also the perfdata. I added the services by enabling the "graphed-service" use. Did I miss something?

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• safari 5 doesnt work on my computer.

  - by Amairani409

  I just got the new version of safari y downloaded because my mac tell me there was new version that I should be getting. but when I try to run my this new version of the aplication .nothing happends¡ I mean the program seems to be working but nothing apears in the screen and so when I try to see my top sites a little window show up but it just dont show anything. then 3 seconds later the program shut down¡ I dont know why is happening this Im not so a expert in computers but this really is away of all I see on safari and on mac I got Mac OS X version 10.5.8 2.66ghz intel core 2 duo 4gb 1067 MHz DDR3

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• JAVA vs .NET Technology - Way 2 go Futher

  - by Sarang

  I have my subject .net acedemically. I also learned core-java and did a project as well. I took training from a java firm. Now, as a skill I do have knowledge as both language. But, it is creating a large problem to me that, which field I should chhose? Even if having better OOP funda, will it be easier for me to transfer from one-another in future ? Please suggest me a way. Also, we do have may technologies available at both side, like JSP, JSF, J2ME, Share Point, SilverLight etc. Which is better as per their reliabity point of view? Which are fast growing and useful technologies used mostly in current IT corporate world ? Are they easier to learn at fresher's point of view? Please answer. Perhaps, this answer may help me mostly to create my way to learn them and go further.

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• anonymous access to ftpd

  - by gcb

  I need FTP on my local LAN so my scanner can send me scans. I am on Debian sid. I installed ftpd and created the user anonymous. I removed anonymous from /etc/ftpusers When I try to login as anonymous it says: login failed. I can't seem to find any log file. I'm using FTP server (Version 6.4/OpenBSD/Linux-ftpd-0.17) update:I needed that so my printer had one place to store my scanned documents on the LAN. solved that buying a dedicated USB pen drive (thankfully I bought a printer one with plenty of options) but in the past this was a very simple task. Install ftpd, specify the directory for anonymous access, and be done with it. now every ftp daemon has several layers of security and chroot in it's core... this is just crazy when all you need a place for a printer to dump files in a secured network.

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