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  • Can enabling a RAID controller's writeback cache harm overall performance?

    - by Nathan O'Sullivan
    I have an 8 drive RAID 10 setup connected to an Adaptec 5805Z, running Centos 5.5 and deadline scheduler. A basic dd read test shows 400mb/sec, and a basic dd write test shows about the same. When I run the two simultaneously, I see the read speed drop to ~5mb/sec while the write speed stays at more or less the same 400mb/sec. The output of iostat -x as you would expect, shows that very few read transactions are being executed while the disk is bombarded with writes. If i turn the controller's writeback cache off, I dont see a 50:50 split but I do see a marked improvement, somewhere around 100mb/s reads and 300mb/s writes. I've also found if I lower the nr_requests setting on the drive's queue (somewhere around 8 seems optimal) I can end up with 150mb/sec reads and 150mb/sec writes; ie. a reduction in total throughput but certainly more suitable for my workload. Is this a real phenomenon? Or is my synthetic test too simplistic? The reason this could happen seems clear enough, when the scheduler switches from reads to writes, it can run heaps of write requests because they all just land in the controllers cache but must be carried out at some point. I would guess the actual disk writes are occuring when the scheduler starts trying to perform reads again, resulting in very few read requests being executed. This seems a reasonable explanation, but it also seems like a massive drawback to using writeback cache on an system with non-trivial write loads. I've been searching for discussions around this all afternoon and found nothing. What am I missing?

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  • Dropped Dell XPS has hard-drive trouble

    - by Alex B.
    Yesterday, my mom dropped her laptop to the floor and got the blue screen of death after trying to boot the system. I was able to start a Fedora live CD and get some of her stuff off the hard drive, but I cannot seem to be able to install Windows on it. The installation starts loading files and then the computer turns off. I am thinking that she might need a new hard drive. Any ideas? Edit: I actually was able to boot the Windows XP installation but it is saying that no hard disk is detected. How can this be possible if I was able to mount the drive on fedora yesterday?

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  • Do I need DELL OpenManage to generate snmp traps on RAID degradation?

    - by jishi
    I need to setup surveillance on all our servers to spot any RAID degradation in time. However, not all of our servers have OpenManage installed, and since they are in production I don't like the idea of installing it on them. Therefor: Is it necessary to have it installed in order to get an event-log for any degradation of the RAID? Because, if I get an event-log I can send an SNMP trap, if I understand it correctly. I thought it was the driver that responsible for the event-logging, but on a machine that recently had a degradation, I can't seem to find any log event for it.

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  • Bad Intel DQ965GF motherboard? Fails memtest, but memory is good.

    - by Boden
    I've got a machine with a DQ965GF motherboard. Two days ago it started locking up hard. Ran memtest 3.3, 1.7, and TestMem 4. TestMem just freezes, memtest failed on moving 8 bit inversions. Letting memtest run eventually causes the system to restart. I pulled memory sticks one by one, and then replaced the memory with a couple of known good sticks. No luck. I switched power supplies, didn't help. Swapped video cards just to be safe. No help. When I start the machine I get a single beep before it POSTs. According to the manual, a single beep means: 1 beep - Refresh Error (with nothing on the screen and it is not a video problem) I'm assuming that the motherboard has failed since it's obviously not a RAM or power issue. Do you agree? NOTE: I also tried resetting BIOS defaults, and even flashed the BIOS to the latest version. I also ran the Mersenne Prime Test and the CPU seems to click along just fine. (Tried logging in to superuser with openid but it's not working for me today. Hope this gets through)

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  • Lenovo remote control media redirect

    - by Braithwaite Patrick Sean
    On a lenovo ThinkServer RD240 running firmware 1.20 with the latest BNC software, using the remote console to redirect a CD-ROM fails with the error: "CD-ROM redirection is not supported on this platform". Similar error for forwarding an iso image, foppy and USB drive. I tried executing the management console from Ubuntu, Windows 7 and OS X with the exact same error. The question is: What platform does the jViewer console support any kind of media redirection?

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  • What happens if I pierce a TFT monitor?

    - by sharptooth
    What happens if I pierce a TFT monitor screen with something sharp (say a nail)? Will only the pierced region malfunction or the whole monitor screen? There's an opinion that in this case the entire screen will "flow out" (more specifically - "liquid crystals will flow out") and stop working completely. Is that truth or an urban legend?

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  • How do you enable multi-core virtualization in Windows 8 Pro?

    - by Greg B
    I've just got a new Dell Vostro 470 with a quad core (8 threads) i7 3770 and I'm trying to run virtual machines on it, which works fine, except if I want to assign multiple cores to a VM. I've checked the bios which states Intel Virtualization Technology [Enabled], but both Hyper-V and VirtualBox will only allow me to assign a single core. If I run the Intel Processor Identification Utility on the host OS it tells me that Intel Virtualization Technology isn't supported by the processor, but according to the Intel website, it is. So whats going on? Have Dell clipped the i7's wings? Is there some config in Windows I need to change?

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  • HP Proliant DL360 G5 + MSA50 RAID Setup recommendations

    - by JohnRB
    I am running a HP Proliant DL360 2 x 3GHz Xeon 16GB Ram P400 integrated RAID card with 6 x 73GB SAS HDDs running Ubuntu Server 14.04 CLI only. I recently got my hands on a MSA50 SAS Enclosure (10 x SAS HDD bays w/ SAS in/out interface) and wondering what you guys recommended as far as an addon raid controller for one of the pciex slots. I have both slots free Full and Half sizes. Any suggestions are greatly appreciated, I am an I.T. Consultant but have not used these particular units before so I was hoping to hear from someone who has. Thanks!

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  • Keyboard and monitor recommendations

    - by Dmn
    I'm about to get a 23" monitor to connect to my laptop for programming, and general multimedia besides. This is the monitor; what do you think? Also, would you recommend getting a keyboard to use instead of the laptop's one? It seems like it would be awkward otherwise. This is the keyboard I'm looking at because it seems to have the low laptop style keys. Would you recommend something different?

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  • Best bang for buck, pivotable, non-TN, >= 1920*1200, LCD screen ? [closed]

    - by julien
    I was almost set on getting a Samsung - SyncMaster 2343BW PIVOT, due to the high resolution, pivot and uber-cheapness. But after reading the comment on this SU question, I was bummed to realize it's a TN screen, which apparently would be a pain for my inteded use ; i.e. portrait mode for reading/coding. Do you know of a comparable model that is "IPS or PVA/MVA", but won't break the bank ? cheers

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  • Hiding monitor from windows, working with it from my app only [closed]

    - by Mikhail
    I need to use a monitor as a "private" device for my special application, I want to use it as a flashlight of a sort and draw special patterns on it in full screen. I don't want this monitor to be recognized by OS (Windows 7) as a monitor. I.e. user should not be able to move mouse to that monitor, or change its resolution, or run screensaver on it or whatever. But I want to be able to interact with it from my application. Monitor is plugged using an HDMI cable to a video card (most probably nVidia). What is the simplest way to do this? All solutions are appreciated, including purchasing additional adapters or simple video cards, or any other special devices.

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  • PSU died, is hard drive fried? Are other components damaged?

    - by srand
    After discovering and replacing my dead PSU, I was able to boot back into Windows. Everything seems to be working fine, however, one hard drive is not. Windows 7 says that this SATA hard drive needs to be formatted before it can work. Can the data be recovered? Also, is there a way to check the integrity of the other components of my computer or assume they will work fine?

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  • Restarting an IBM BMC without restarting the server itself

    - by SRobertJames
    I have a few servers with IBM BMC (Baseboard Management Controller). I'd like to power cycle the BMC without restarting the server. Is this possible? How? Note: On one of them, the web interface is down; so I'd need to either do this by physically restarting the BMC (not sure how to do this - even the power button on the server isn't supposed to recycle the BMC, I believe) or via the UDP or SNMP interface (again, not sure how to do that either)

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  • Hard Drive Light Emulator

    - by ProfKaos
    I've just got a new Dell Inspiron, and I'm a little disconcerted without the reassurance of a flashing hard drive light, especially with long installs. Is there something that can reveal HDD activity onscreen, e.g. in the system tray?

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  • Is there an eSATA memory stick / thumb drive?

    - by jasondavis
    The new PC I just finished building has eSATA support. I use a USB stick/thumb drive all the time on my PC for stuff, is there an equivalent available anywhere for eSATA? Please list one product per post, and provide a link to the manufacturer's product page. Also see the USB-3 version of this question.

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  • ASUS EAH5770 CuCore problem: VLC Stutting!

    - by aiacet
    Hello to everyone and thank you in advance to all the people that will want help me. Like in the title my problem concernig this boring stutting when i play a Tv series episodes or a film on VLC whit my mew PC. Pc components are: AMD Phenom II X4 955 Black Box 125W Asus M4A785TD-M EVO Radeon HD5770 1GB GDDR5 Asus CoolerMaster GX 650W G.Skill 2x2GB PC3-12800 1600Mhz-787 4GBECO Western Digital 1TB SATAII 64MB Monitor are SyncMaster 920Nw OS: Windows XP 32 bit Display adapter drivers are updates at the latest release (catalyst 10.4) and also the ATi Vga bios are updated Besides when i play the same episode with DivX Plus Player i have video and audio stutting. I can play very well Dragon Age Origin and other games but i'm unable to see a beutyfull movie. Please help me

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  • Why is my Asus P5PL2-E using 640MB of RAM (out of 4GB) ? [closed]

    - by Tom
    Possible Duplicate: Windows XP and RAM 3.5GB+ I've recently installed 4GB of RAM on my server, which is running Windows XP SP2 32-bit and My Computer showed that only 3.37GB were installed. After digging Google for a bit, I couldn't find anything helpful, but I do remember reading a post in a forum regarding the motherboard using 640MB of RAM. Digging in my own BIOS, I've also found that my motherboard has also reserved that amount for its self. Why does my motherboard reserve this memory and how can I tune it down to say 128MB?

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  • Mounting root failed. Dropping into basic maintenance shell

    - by vmsystem
    Hi, I have purchased AMD Phenom X4 955 3.2GHZ processor with supporting gigabyte GA-MA785GM-US2H mother board / 6GB DDR2 RAM / 500GB SATA drive for learning Vmware ESX 3.5 product. In the above configuration, I have installed windows xp 64 bit operating systems and continue to installed vmware workstation 6.5. From the VM workstation, I can able to install ESX3.5 update2, but I unable to start properly, please refer the below mention error. “Mounting root failed. Dropping into basic maintenance shell. To collect logs for VMware, connect a USB storage device and run 'bin/vm-support '. Machine will be rebooted when you exit from this shell.” The same was tested in the windows 2003 Enterprise Edition server / windows 7 32bit / windows 7 64bit also, Please help me to resolve the issue.

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