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• Flexible virtualization infrastructure Design with libvirt

  - by Lessfoe

  I'm going to install a CentOS6 Server with Virtualization ( libvirtd ) capabilities on a DELL Server with Hardware RAID5 of around 6T of disk space ( It has 4x2T disks in a PERC700 RAID Controller ). I'm going then to install some guests which requires few resources except one that needs 500GB of disk space, 8/16GB of RAM and good performances. I was thinking about file images for guests storage but I'm not sure about the 500GB VM what needs good performances so that an LVM device could be better. So my question is what would be the best layout concerning: RAID setup ( RAID5, RAID1 + 1 disk for OS only. ) disk partitioning ( using the entire disk/ leave free space for future use and extending it with LVM ) guests storage management ( LVM devices or file images ( considering the 500GB VM that is performance demanding ) or mixed ) Where to put guests storage? /var/lib/libvirt/images or maybe in a custom dir separated from system /home/VMs Thanks in advance for any hint.

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• How small is too small (of laptop for a programmer)

  - by defn

  Im thinking of replacing my HP Pavilion dv5-1004nr with Acer Aspire AS5738-6444, I'm a CS student... so im torn between screen size (liking the 15in and decent gpu.. but it weight nearly 8 pounds and battery can barely last 2 hours in power saver mode) and wanting something portable to carry to classes/take notes ect (3 pounds and up to 8 hour battery life of the acer) what would you guys suggest? acer any good? i love my hp keyboard.. (or have links to other good laptops, im aiming for 600$ range?)

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• Idle hard disk makes noise.

  - by ULTRA_POROV

  Like a fan or something. I checked it. I stopped all fans (cpu, video, psu) and the noise was still there. I read online that it might be a motor or something. I have put a great deal of effort making my pc quiet. Installed a quiet psu and cpu fan, reduced the fan speed of my video card, bought a ssd... But my drive for data makes this noise. I would never have expected that. Do all hard disks make this kind of noise? I guess most people won't notice it because of the other fans they have in the system, I however can hear it quite clearly because all my other fans are almost silent. So should i get a new one or should i just live with it, considering that i might end up with a drive that also makes this noise.

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• How to tilt a rigid LCD Wall Mount?

  - by benoror

  I recently bought a Wall Mount for my 24" LCD TV, it is just a few feet above my workspace desktop, but I need it to be a little bit tilted because I'm quite near the screen. I can't afford another wall-mount device, any ideas ? Description of the mount: http://bit.ly/cfyrEG

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• Mini-ITX board for AM3 Athlon X4 600e processor.

  - by Kamil Zadora

  Hello, I am planning to build a PC to control a robotic platform that I am building (about 50% complete). I need more power than ATOM platform could bring, as the robot will need to do on the fly image processing to work as intended. I was considering using Athlon X4 600e as it is rated 45W Maximum output. Probably underclocked it would go lower than 30-35W. I do not I'am at very long battery life, but the 17Ah, 12V battery should keep it running for few hours. My problem is: motherboard. I am space limited so I am looking for a nice mini-itx AM3 motherboard to match the processor. It is hard to find many tests about power usage of the motherboards itself (for example, when using the same processor on different motherboards, test are usualy done in the opposite matter). Could you provide any motherboard examples or suggest what chipset to look for? Thank you in advance.

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• Internet not working on a VirtualBox Linux machine

  - by mtahmed

  I installed VirtualBox on a Windows 7 PC and installed Xubuntu (Ubuntu with XFCE) on it. Now on the Windows, I am connected to the internet through a LAN which automatically authenticates to connect to the network(because its my work computer). I have also installed the guest additions on this virtual machine (Xubuntu). I tried both NAT and bridging to set up internet connection but I still cannot connect to the internet. For NAT: The browser doesn't say website not found but it keeps trying to load it forever and the network status monitor (the one provided by VirtualBox) doesn't show any green light (no incoming packets). For Bridging: Same as for NAT but the network status monitor shows incoming packets and outgoing packets. But internet still doesn't work. I tried a lot of different things but none worked.

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• Do superuser's prefer business grade or consumer grade PCs?

  - by joelhaus

  Having burned through a number of consumer grade laptops in recent years, I'm wondering if the additional cost of a business grade computer is a worth while investment. I'm considering getting a laptop with slightly lower specs to justify the added cost. The primary benefits I see are: (i) the notebook will be more reliable, (ii) have a longer life and (iii) the warranty (parts and labor) will be 3 years instead of 1 year. Are there any other considerations one should keep in mind when shopping for a business grade PC? Is purchasing direct from the manufacturer wise or are there other options that should be considered too? Thanks in advance!

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• How to safely remove a device blocked by the System process with a handle on \$Extend\$RmMetadata\$Txf

  - by Heinzi

  I have an external HDD which I would like to "safely remove". Unfortunately, my system (Windows 7 x64) complains that "the device is currently in use". Using Process Explorer I discovered which process is holding a handle on the device: Obviously, System is not a process that I can just kill and be done with it. I've done a bit of research and this seems to be a common problem, but no solution has been found so far (except for rebooting the machine, which I'd like to avoid if possible). Is there any solution to this problem that I've missed?

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• Replacing an ATA-100 hard drive

  - by Pieter

  I was instructed to replace the hard drive in an old laptop, a Dell Latitude D505. I'm suspecting that there was a head crash when someone moved the laptop while it was turned on. In the specifications, I found this about the hard drive: 30GB ATA-100; (4200RPM); 40GB ATA-100 (5400RPM); 60GB ATA-100 (4200RPM) *Optional 40GB (5400) 2nd HDD Module for media bay I'm familiar with SATA and IDE, but ATA-100 doesn't ring a bell. What do I have to take into account when I go look for a replacement hard drive?

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• Fixing sticky keys without removing the keys?

  - by Earlz

  Hello, we had an E-Machine netbook brought in today that has sticky keys. (don't ask me why we said we'd fix it) Well, I've looked at a few howtos for fixing it, but they all require removing the keys. When I tried to remove the keys, I got the key to like a 45 degree angle and it still didn't budge, so I'm pretty sure the keys are non-removable. Is it common for places to even be able to find a replacement keyboard for netbooks and is there a way to fix sticky keys without removing the keys?

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• Core i7 920 vs 870

  - by JL

  I am not sure which is better. Surely with processors you would think the 920 would be a higher version because 920 870. What's bothering me is that the 870 seems to have a higher clock speed, so which one is the better processor?

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• WiFi N Gigabit Router

  - by SLaks

  I'm looking for a WiFi N Gigabit router. I'll be using an iPod Touch 2G and a 2009 17" MacBook Pro over WiFi, and I need at least 4 gigabit ethernet ports plus a WAN port. What do people recommend? In particular, are there any compatibility issues between different WiFi N drafts that would limit the speed of the MacBook, and is it worth getting dual-band?

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• ergonomic mouse recomendations

  - by Zachary

  I've searched the site and did not find this exact question asked, so I'm going to ask it. Does anyone have a recommendation, or can point in the direction of resources, for a good ergonomic mouse?

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• Are there open source Linux drivers for the Panda Wifi USB adapter?

  - by Zifre

  I'm looking for a wireless adapter for my new PC. My requirements are: it supports 802.11n it is cheap (under 30 USD) it has good, open source Linux drivers (will work "out of the box") preferably USB, but PCI is okay too I found the Panda Wifi (b/g/n) 150Mbps Wireless-N (802.11n) USB Adapter. It says there is Linux support. However, I want to make sure there are open source drivers included with the Linux kernel. Does anyone know what the chipset for this adapter is? What driver it would use?

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• Why does my DVD drive spin up every minute or so, spin down, and repeat (new Dell Studio 15 with Win

  - by cybergibbons

  We have just got a new Dell Studio 15 laptop running Windows 7 home premium with slot load DVD drive. If there is a DVD drive in the drive, every minute or so, the drive will spin up, make a couple of noises like it is reading something and then spin down. I think this is ruining battery life. There is no software running that is obviously accessing the drive. Any ideas to what it could be? Are there any tools I could use to try and identify the problem? Thanks.

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• Computer has video artifacts after been exposed to rain

  - by Sadie

  My desktop now displays video artifacts after been exposed to rain. Only a very small amount of moisture went inside the case. The only place I noticed any water was on the CPU socket. I used a hair dryer and paper towels to wick any remaining moisture. When I boot the PC it loads it the OS, but there are large numbers of video artifacts. The artifacts appear symmetric if that helps. I am wondering what components I need to replace. I'd like to salvage what I can. My setup: AMD Athlon x3, Asus main board (AM2 socket), nVidia GT 430 PCIe, 8gb (4gb x2) DDR3

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• Idling CPU at 65C, re-place or re-paste?

  - by Event_Horizon

  Replaced Graphics card because screen would go black at a certain temp while gaming, but sound would stay on (but locked up). Then with replacement card whole PC shuts off during gaming now because the CPU is overheating. Note: CPU is only supposed to go up to 71C max according to manufacturer and it goes well over upon load. System Temp: 30C TL;DR: Idling CPU at 65C, started to shut down due to overheating, re-place (CPU, or CPU and Motherboard) or re-paste?

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• Zero-channel RAID for High Performance MySQL Server (IBM ServeRAID 8k) : Any Experience/Recommendati

  - by prs563

  We are getting this IBM rack mount server and it has this IBM ServeRAID8k storage controller with Zero-Channel RAID and 256MB battery backed cache. It can support RAID 10 which we need for our high performance MySQL server which will have 4 x 15000K RPM 300GB SAS HDD. This is mission-critical and we want as much bandwidth and performance. Is this a good card or should we replace with another IBM RAID card? IBM ServeRAID 8k SAS Controller option provides 256 MB of battery backed 533 MHz DDR2 standard power memory in a fixed mounting arrangement. The device attaches directly to IBM planar which can provide full RAID capability. Manufacturer IBM Manufacturer Part # 25R8064 Cost Central Item # 10025907 Product Description IBM ServeRAID 8k SAS - Storage controller (zero-channel RAID) - RAID 0, 1, 5, 6, 10, 1E Device Type Storage controller (zero-channel RAID) - plug-in module Buffer Size 256 MB Supported Devices Disk array (RAID) Max Storage Devices Qty 8 RAID Level RAID 0, RAID 1, RAID 5, RAID 6, RAID 10, RAID 1E Manufacturer Warranty 1 year warranty

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• Intel D2500HN Atom D2500 Doesn't turn on

  - by David W

  I recently bought parts from Amazon to build an embedded PC, and have assembled everything. I have: Intel D2500HN Mini-ITX Motherboard Mini-Box Pico-PSU 80 M350 Universal Min-ITX Enclosure 2GB DDR3 Memory Kinamax AD-LCD12 LCD Monitors 12V 6A 72W AC Adapter Power Supply The motherboard gets a light (on the motherboard, not on the Pico-PSU) when I plug it into the power adapter. Furthermore, I see the power switch light come on when I press the power button. However, the display doesn't turn on, and it doesn't seem that the PC is actually turned on. Since I'm seeing these lights, I know that the motherboard is getting power. Furthermore, the display VGA port is embedded into the motherboard, so that's not the issue. I'm just trying to figure out what COULD be the issue aside from a faulty motherboard. I have a diagram of the D2500HN motherboard which labels everything, and have ensured that the power LED as well as the On/Off cables are plugged into the right spots, although to be sure I've tried flipping these two cables around, and also plugging 1 cable into the other cable's spot & vice-versa. Is there anything else you folks think I may be missing, or anything else I can do to try to troubleshoot this issue before sending the motherboard back?

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• Mutli-processor workstation as a workstation/server

  - by posdef

  I work in a research institute and a number of programs we use are computationally intensive (I actually wrote one of them). Right now we have one computer that is dedicated for one of these programs (with local accounts only, as in users physically sitting in front of that pc) and the other programs are run on individual workstations assigned to people. I have been looking around to common brands such as Dell and HP, for a some sort of a small/medium scale server, which can be used as a workhorse by sending tasks remotely. It appears as if there is nothing in between workstations with one 6-core processor and a bunch of extras (like fancy graphics etc) and rack mount servers with ridiculous amount of RAM and HDD expansion capabilities but still relatively little number of processors/cores. I wonder if what I am looking for is such a small niche product? Are there other solutions that I might not be aware of? Does anyone know of a multi proc- multi-core workstation/server that is still within the reasonable

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• Mac Grey/White Screen of Death

  - by cust0s

  The other night I updated my iTunes to the latest version (through Software Update) when I came to turn on my computer I was greeted with the dreaded white screen of death. I use an early 2008 iMac 24". I've tried the basic things, unplugging/turning off accessories, trying to boot from the install disk, reseting pram, etc, etc. Still no luck and no change what-so-ever. All I've been able to ascertain that my keyboard still works (by ejecting). I should point out that I did recently replace my Hard drive with a Western Digital Black 500GB (though the computer is well out of warrenty) and I'm a little concerned that the problem could be the screen.

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• NIS client cannot find NIS server (Opensuse)

  - by Tony

  I installed NIS server on head node of a virtual cluster(VirtualBox). One of the node (let's say node-1) can find NIS server and work with it, but another node (node-2) just can't find the NIS server in Yast while it can ping and ssh to both head node and node-1. BTW, all the nodes are VMs, head node and node-1 are on the same physical machine, node-2 is on another physical machine. I set the domain name in /etc/hosts and /etc/yp.conf, and ypwhich sometimes gives the correct domainname several minutes later complains about "ypwhich: Can't communicate with ypbind", and will back to work after some time. Also tried rpcinfo -p hostname and it worked as expected. I almost tried every thing I can find on internet, but seems that not many people had this problem. Any help would be very appreciated.

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• Laptop screen brightness stuck

  - by Bart van Heukelom

  I can no longer adjust the brightness of my laptop screen, it's stuck at the lowest. In Linux, the brightness adjustment keys (Fn + F4/F5) still work, since a brightness popup shows and the meter bar changes, but it does this in a strange way. Starting at 100%, each successive press of the "lower brightness" button moves the bar to: 67% 50% 0% 26% 12% Or another random pattern like that. The problem is not Linux however, since I can't change the brightness from Windows (7) either. Where do I even begin to look? Since the problem does not seem be OS-specific, I've searched in the BIOS, but it has no option like that. How did this happen? I think it's been this way since when I lowered the brightness to 0%, then pressed the "lower brightness" key again. Not sure about that though.

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• Is the motherboard the cause of these errors?

  - by ianfuture

  Motherboard is : ASUS A7N8X-E Deluxe, Rev1.01, On start up get: "cmos checksum error - defaults loaded" error BIOS is reset everytime and can't boot to Windows off HDD. POST report is ok once I tell it there is no Floppy drive attached and not to seek it. The boot sequence starts then just as get to load windows safe mode options whole PC shuts down. BIOS is reset to defaults again. I've checked the battery and jumpers. Tried a known working battery. Changed Graphics card, changed memory, changed HD to one without an OS. Disconnected DVD drive. PSU is known to be ok. IN BIOS CPU is recognised correctly and memory is also recognised ok. So is it likely to be a bad motherboard or corrupted BIOS or something else? Thanks :)

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• How many users are "many users"?

  - by kemp

  I need to find a solution for a website which is struggling under load. The site gets ~500 simultaneous connections during peak time, and counts around 42k hits per day. It's a wordpress based site bridged with a vbulletin forum with a lot of contents and a fairly complex structure which makes intensive use of the database. I already implemented code level full page caching (without this the server just crashes), and configured all other caching directives as well as combining css files and the like to limit http requests as much as possible. I need to understand if there is more that can be done via software or if the load is just too much for the server to handle and it needs to be upgraded, because the server goes down occasionally during peak times. Can't access the server now, but it's a dedicated CentOS machine (I think 4GB ram, can't say what CPU) running apache/mysql. So back to the main question: how can I know when the users are just too many?

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