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Thread: hdparm for scsi

  1. #1
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    hdparm for scsi

    Is there such? or how accurrate for scsi is it?

    example:
    /dev/sda:
    Timing buffered disk reads: 108 MB in 3.02 seconds = 35.76 MB/sec

    I see 50meg/sec speed on IDE drives...

  2. #2
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    That is a live test, if the server is under some sort of a load then it will be lower. Yes that is low for a SCSI drive if it is idle.
    John W, CISSP, C|EH
    MS Information Security and Assurance
    ITEagleEye.com - Server Administration and Security
    Yawig.com - Managed VPS and Dedicated Servers with VIP Service

  3. #3
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    Its a live server but not real active at the moment I ran the test, still not active either an hour or two later...

    second test
    /dev/sda:
    Timing buffered disk reads: 108 MB in 3.01 seconds = 35.88 MB/sec

    backup drive
    /dev/hdb:
    Timing buffered disk reads: 162 MB in 3.00 seconds = 54.00 MB/sec

    lol why I was wondering if it was accurrate for scsi drives, I had a program that you could check the speed, temp, pretty much everything about a scsi drive but i forgot what I did with it

    other info
    avg-cpu: %user %nice %sys %iowait %idle
    4.33 0.50 1.30 4.16 89.71

    Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn
    sda 10.26 252.68 285.40 1528764 1726768
    sda1 9.23 121.14 285.40 732922 1726768
    hda 19.62 218.28 209.48 1320640 1267446
    hda1 0.01 0.23 0.00 1396 30
    hda2 9.50 59.69 118.14 361130 714776
    hda3 8.78 153.28 62.12 927410 375864
    hda4 0.00 0.00 0.00 4 0
    hda5 0.33 0.10 10.22 618 61832
    hda6 0.97 4.60 19.00 27818 114944
    hda7 0.00 0.04 0.00 248 0
    hdb 0.44 54.98 0.01 332642 32
    hdb1 0.00 0.07 0.01 410 32

  4. #4
    Join Date
    Jul 2005
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    Hm, that's really low, even for some older 7.2k SCSI. What's the model of your HD? Also, what kernel version are you using?

  5. #5
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    Seagate Barracuda, 2.4.31smp cant run a 2.6 version im having problems with dns, i have a thread on it somewhere around here but havent resolved it yet...

  6. #6
    Join Date
    Jul 2005
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    Barracuda should give much higher throughput... I guess you need to check documentation for your SCSI controller and maybe configure it's driver options.
    Also on 2.4 kernel there's an elvtune command available, which sometimes can give awesome performance improvements for heavy load, but I don't think its settings affect simlpe hdparm test result.

  7. #7
    Join Date
    Mar 2001
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    Try a reboot. We've seen SCSI drives drop in speed dramatically, and a reboot with fsck seems to often clear it up...

    - John C.

  8. #8
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    The first one I posted was after a fresh reboot, second one was couple hours later

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