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  1. #1
    Join Date
    Mar 2008
    Location
    Peru
    Posts
    71

    * Test the disk I/O of your server and post your results here!

    Hi,

    Please run this command in your server:

    dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync

    And post the results here. Please also specify your disk config i.e. single SATA 7.2k drive, single SSD drive, 2 x SATA 7.2k RAID 1, 4 x SAS 15k RAID 10, etc.

    Thank you,
    Jonathan

  2. #2
    Join Date
    Aug 2003
    Posts
    597
    dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
    16384+0 records in
    16384+0 records out
    1073741824 bytes (1.1 GB) copied, 11.7501 s, 91.4 MB/s

    without conv=fdatasync i get about 700MB/s

    How do I find out the disk controller?
    Last edited by topgun; 03-20-2011 at 09:52 PM.

  3. #3
    Join Date
    Aug 2009
    Location
    LAX, DAL, MIA, ATL!
    Posts
    3,310
    Sorry OP for requesting something in your thread, But if possible could everyone post which RAID controller they are using as well?
    〓〓 QuadraNet ├ CLOUD ├ DEDICATED ├ COLOCATION
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  4. #4
    Join Date
    Mar 2009
    Location
    Middle East
    Posts
    30
    4 x SAS 15k RAID 10

    # dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync

    16384+0 records in
    16384+0 records out
    1073741824 bytes (1.1 GB) copied, 10.0099 seconds, 107 MB/s

    2 x SATA 7.2k RAID 0

    ]# dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
    16384+0 records in
    16384+0 records out
    1073741824 bytes (1.1 GB) copied, 7.77142 seconds, 138 MB/s

  5. #5
    Join Date
    May 2006
    Location
    Chicago, IL
    Posts
    172
    dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
    16384+0 records in
    16384+0 records out
    1073741824 bytes (1.1 GB) copied, 6.24999 seconds, 172 MB/s

    No clue on specifics right now, on a friends dedi that I use. Will edit the post with specifics in the morning

  6. #6
    Join Date
    Mar 2008
    Location
    Peru
    Posts
    71
    Quote Originally Posted by MaGoD View Post
    4 x SAS 15k RAID 10

    # dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync

    16384+0 records in
    16384+0 records out
    1073741824 bytes (1.1 GB) copied, 10.0099 seconds, 107 MB/s
    That's low considering you're using a RAID 10 array of 4 x SAS 15k drives. What's your controller?

  7. #7
    Join Date
    Mar 2009
    Location
    Middle East
    Posts
    30
    Quote Originally Posted by jscieza View Post
    That's low considering you're using a RAID 10 array of 4 x SAS 15k drives. What's your controller?
    http://www.adaptec.com/en-us/support...raid/sas-3405/

  8. #8
    Join Date
    Aug 2006
    Posts
    849
    Quote Originally Posted by jscieza View Post
    That's low considering you're using a RAID 10 array of 4 x SAS 15k drives. What's your controller?
    yes, very very low
    WebSitePanel / Hosting Controller / Smartermail / Installation / Configuration / Troubleshooting / Migrations
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    I speak English and Spanish

  9. #9
    Join Date
    Mar 2009
    Location
    Middle East
    Posts
    30
    is there somthing i can do here to increase the results
    or should i contact my provider

  10. #10
    Join Date
    Aug 2007
    Location
    L.A., CA
    Posts
    3,706
    you are obviously using your machine, its not like you are going to get full performance with IO load already on it

  11. #11
    Join Date
    Dec 2005
    Posts
    1,270
    Using SSD - No Raid - Backup to R1Soft server.
    dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
    16384+0 records in
    16384+0 records out
    1073741824 bytes (1.1 GB) copied, 4.4834 s, 239 MB/s

  12. #12
    Join Date
    Mar 2009
    Location
    Middle East
    Posts
    30
    Quote Originally Posted by CGotzmann View Post
    you are obviously using your machine, its not like you are going to get full performance with IO load already on it
    i host busy website on that server , just 1 website only

    with Steven/rack911 taking care of it and litespeed 4cores license

    everyting works great

  13. #13
    Join Date
    Mar 2002
    Location
    Posts
    785
    Is this a proper way to test disk I/O?
    High Quality Web Hosting from Host Ultra
    Visit us online at www.hostultra.com

  14. #14
    8x 15k sas raid10 with 5805

    [[email protected] ~]# dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
    16384+0 records in
    16384+0 records out
    1073741824 bytes (1.1 GB) copied, 4.32078 seconds, 249 MB/s
    [[email protected] ~]# uptime
    07:58:09 up 178 days, 8:04, 1 user, load average: 3.94, 4.60, 4.74
    [[email protected] ~]#

  15. #15
    Join Date
    Mar 2011
    Posts
    67
    16384+0 records in
    16384+0 records out
    1073741824 bytes (1,1 GB) copied, 13,686 s, 78,5 MB/s

    Software RAID1 on 2 standard SATA discs with quite a bit of load already.

  16. #16
    Join Date
    Mar 2008
    Location
    Peru
    Posts
    71
    Quote Originally Posted by Host Ultra View Post
    Is this a proper way to test disk I/O?
    It tests sequential write speed. It's a good way to have a reference of how good is your disk I/O.

  17. #17
    Join Date
    Dec 2009
    Location
    Chile
    Posts
    68
    16384+0 records in
    16384+0 records out
    1073741824 bytes (1.1 GB) copied, 8.60977 seconds, 125 MB/s
    4x250 gb sata soft raid 10.

  18. #18
    Join Date
    Jun 2007
    Location
    Connecticut
    Posts
    106
    2x 500GB 7200 RPM Western Digital WD Caviar RE3 WD5002ABYS

    Code:
     dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
    
    16384+0 records in
    16384+0 records out
    1073741824 bytes (1.1 GB) copied, 14.3427 seconds, 74.9 MB/s
    SW Raid - 1x 500GB 7200 RPM Western Digital WD Caviar RE3 WD5002ABYS
    Code:
    dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
    16384+0 records in
    16384+0 records out
    1073741824 bytes (1.1 GB) copied, 14.361 seconds, 74.8 MB/s
    SW Raid - 4x 500GB 7200 RPM Western Digital WD Caviar RE3 WD5002ABYS
    Code:
    dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
    16384+0 records in
    16384+0 records out
    1073741824 bytes (1.1 GB) copied, 10.614 seconds, 104.8 MB/s
    Drive controller used: Onboard from SuperMicro X8SIE-F board.
    Adam Piatek - CTO Ritmo Technology Group
    Dedicated Servers, Web Hosting Solutions Ventrilo Servers
    adam (at) ritmohost (dot) com

  19. #19
    Join Date
    Mar 2011
    Location
    Rochester,NY
    Posts
    18
    16384+0 records in
    16384+0 records out
    1073741824 bytes (1.1 GB) copied, 14.6055 seconds, 73.5 MB/s


    Good or bad.

  20. #20
    Join Date
    Mar 2011
    Location
    Rochester,NY
    Posts
    18
    Quote Originally Posted by sbwcws View Post
    16384+0 records in
    16384+0 records out
    1073741824 bytes (1.1 GB) copied, 14.6055 seconds, 73.5 MB/s


    Good or bad.

    I got that on a Xenserver VM

  21. #21
    Join Date
    Dec 2004
    Posts
    209
    Single 250Gb SATA
    [[email protected] ~]# dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
    16384+0 records in
    16384+0 records out
    1073741824 bytes (1.1 GB) copied, 9.00074 seconds, 119 MB/s

    GigeNet Cloud Server:
    [[email protected] ~]$ dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
    16384+0 records in
    16384+0 records out
    1073741824 bytes (1.1 GB) copied, 37.5152 seconds, 28.6 MB/s

    Raid10 x 8 @ 2TB - DELL PERC H700
    [[email protected] ~]# dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
    16384+0 records in
    16384+0 records out
    1073741824 bytes (1.1 GB) copied, 5.37863 seconds, 200 MB/s

    Raid10 x 4 @ 2TB - Adaptec 5405G
    [[email protected] ~]# dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
    16384+0 records in
    16384+0 records out
    1073741824 bytes (1.1 GB) copied, 5.56825 seconds, 193 MB/s

    Raid10 x 5 @ SAS 15k 146GB (1 spare) - Adaptec ASR5805
    [[email protected] ~]# dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
    16384+0 records in
    16384+0 records out
    1073741824 bytes (1.1 GB) copied, 5.95354 seconds, 180 MB/s

    Raid10 x 8 @ 1.5TB - ARC-1680
    [[email protected] ~]$ dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
    16384+0 records in
    16384+0 records out
    1073741824 bytes (1.1 GB) copied, 4.11376 seconds, 261 MB/s
    Busy, busy, busy

  22. #22
    Join Date
    Oct 2010
    Location
    Malaysia
    Posts
    95
    2 x SATA 7.2k RAID 1

    -bash-3.2$ dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
    16384+0 records in
    16384+0 records out
    1073741824 bytes (1.1 GB) copied, 8.89054 seconds, 121 MB/s

    -bash-3.2$ dd if=/dev/zero of=test bs=64k count=16k
    16384+0 records in
    16384+0 records out
    1073741824 bytes (1.1 GB) copied, 1.84299 seconds, 583 MB/s

    2 x SATA 7.2 RAID 0

    dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
    16384+0 records in
    16384+0 records out
    1073741824 bytes (1.1 GB) copied, 9.40929 seconds, 114 MB/s


    dd if=/dev/zero of=test bs=64k count=16k
    16384+0 records in
    16384+0 records out
    1073741824 bytes (1.1 GB) copied, 1.05664 seconds, 1.0 GB/s
    Last edited by Netxons; 03-21-2011 at 01:27 PM.

  23. #23
    Join Date
    Jul 2010
    Posts
    60
    2 x 120G SSD RAID 0

    dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
    16384+0 records in
    16384+0 records out
    1073741824 bytes (1.1 GB) copied, 2.44006 seconds, 440 MB/s


    dd if=/dev/zero of=test bs=64k count=16k
    16384+0 records in
    16384+0 records out
    1073741824 bytes (1.1 GB) copied, 0.96452 seconds, 1.1 GB/s

  24. #24
    Join Date
    May 2006
    Location
    NJ, USA
    Posts
    6,456
    [[email protected] ~]# dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
    16384+0 records in
    16384+0 records out
    1073741824 bytes (1.1 GB) copied, 5.86699 seconds, 183 MB/s
    [[email protected] ~]#
    4 WD blue 1TB RAID10 - Xen Dom0 with 10 guests running (Adaptec 2405)

    [[email protected] ~]# dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
    16384+0 records in
    16384+0 records out
    1073741824 bytes (1.1 GB) copied, 13.8645 seconds, 77.4 MB/s
    2 RE3 500GB RAID1 (Dell RAID)
    simplywww: directadmin and cpanel hosting that will rock your socks
    Need some work done in a datacenter in the NYC area? NYC Remote Hands can do it.

    Follow my "deals" Twitter for hardware specials.. @dougysdeals

  25. #25
    Join Date
    Jul 2009
    Location
    New Zealand
    Posts
    2,320
    Softlayer production VPS node 4x500 SATA II (RAID10)

    dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
    16384+0 records in
    16384+0 records out
    1073741824 bytes (1.1 GB) copied, 7.45054 seconds, 144 MB/s

    another one:

    dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
    16384+0 records in
    16384+0 records out
    1073741824 bytes (1.1 GB) copied, 6.77026 seconds, 159 MB/s
    Last edited by QuickWeb-Roel; 03-21-2011 at 05:30 PM.
    QuickWeb™ -We Host Servers Like a Boss!
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  26. #26
    Join Date
    Feb 2006
    Location
    Boston, MA
    Posts
    58
    4x 250 GB RAID 10, HP Smart Array with 512 MB cache

    Vroom:

    Code:
    dd if=/dev/zero of=test bs=64k count=16k
    16384+0 records in
    16384+0 records out
    1073741824 bytes (1.1 GB) copied, 2.7123 seconds, 396 MB/s
    Code:
    dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
    16384+0 records in
    16384+0 records out
    1073741824 bytes (1.1 GB) copied, 4.86733 seconds, 221 MB/s
    Some people say dd may not be the most accurate way to test disk IO. I can't find my sources though.
    Akliz, Inc.
    www.akliz.net | 617-475-3266

  27. #27
    Join Date
    Dec 2010
    Posts
    224
    Old laptop - 1 x PATA 5.4k 30gb
    1073741824 bytes (1.1 GB) copied, 50.0977 s, 21.4 MB/s

  28. #28
    Join Date
    May 2006
    Location
    Chicago, IL
    Posts
    172
    Quote Originally Posted by e-hoster View Post
    Old laptop - 1 x PATA 5.4k 30gb
    1073741824 bytes (1.1 GB) copied, 50.0977 s, 21.4 MB/s
    NICE! How many hosting accounts I can put on server?

    /sarcasm

  29. #29
    3WARE controller - RAID5 8 drives
    1073741824 bytes (1.1 GB) copied, 11.4822 s, 93.5 MB/s

    RAIDWEB RAID5 8 drives
    1073741824 bytes (1.1 GB) copied, 9.29532 s, 116 MB/s

    RAIDWEB RAID6 16 drives
    1073741824 bytes (1.1 GB) copied, 6.97683 s, 154 MB/s

    256MB RAM drive (had to decrease size of the test file)
    dd if=/dev/zero of=test bs=64k count=1k conv=fdatasync
    1024+0 records in
    1024+0 records out
    67108864 bytes (67 MB) copied, 0.415747 s, 161 MB/s

    Solid State Drive (PciExpress based)
    1073741824 bytes (1.1 GB) copied, 2.87066 seconds, 374 MB/s
    Professional Streaming services - http://www.tulix.com - info at tulix.com
    Double optimized - AS36820) network, best for live streaming/VoIP/gaming
    The best quality network - AS7219

  30. #30
    Join Date
    Jan 2010
    Location
    Indiana, USA
    Posts
    214
    dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
    16384+0 records in
    16384+0 records out
    1073741824 bytes (1.1 GB) copied, 9.14537 seconds, 117 MB/s

  31. #31
    Join Date
    Mar 2009
    Location
    Austin, TX
    Posts
    934
    4xSATA HDs running Linux SW RAID-10. Empty server with nothing running on it (except one VPS running [email protected] utilizing all cores).


    [[email protected] ~]$ dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
    16384+0 records in
    16384+0 records out
    1073741824 bytes (1.1 GB) copied, 4.229 seconds, 254 MB/s

    *EDIT*
    OS is CentOS 5.5 64bit latest.
    Last edited by quad3datwork; 03-22-2011 at 12:00 AM. Reason: including OS info
    SysAdmin.xyz
    Having severs with customer data on it without proper monitoring is like having one night stand without using protections - eventually, there will be an 'oh s**t!' moment.

  32. #32
    Join Date
    May 2008
    Posts
    660
    dd if=/dev/zero of=/dev/fioa1 bs=64k count=16k conv=fdatasync
    16384+0 records in
    16384+0 records out
    1073741824 bytes (1.1 GB) copied, 1.76383 seconds, 609 MB/s

  33. #33
    Join Date
    Mar 2003
    Location
    WebHostingTalk
    Posts
    16,960
    Dual 12 x 2TB Adaptec Raid6 ( R1soft backup with 51 servers doing the backup ):

    [[email protected] backup]# dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
    16384+0 records in
    16384+0 records out
    1073741824 bytes (1.1 GB) copied, 2.23201 seconds, 481 MB/s

    ------------------

    VPS in 4 x 2TB Adaptec Raid10 with 1000 domains:

    [email protected] [~]# dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
    16384+0 records in
    16384+0 records out
    1073741824 bytes (1.1 GB) copied, 7.81263 seconds, 137 MB/s
    Specially 4 You
    .
    JoneSolutions.Com ( Jones.Solutions ) is on the net 24/7 providing stable and reliable web hosting solutions and services since 2001

  34. #34
    Quote Originally Posted by Host Ultra View Post
    Is this a proper way to test disk I/O?
    no, not at all. Sure, on a totally empty server, you'll see anywhere from 50-200MB/s depending on a number of factors, but who cares? The real performance comes in with random i/o for servers, which this doesn't give you any indication of whatsoever. I had a customer who came and asked why their SSD's only could do 70MB/s (presumably after reading this thread). Really, that's not a fair indication of the performance of an SSD, or any kind of drive. For the access pattern you would be using it for, the random i/o/s is much more valuable, where the SSD would shine, doing easily 30x the performance of a typical hard drive.

    Also, the sequential speeds can mask a larger problem with a misconfiguration. You might see a high sequential speed and think "ok great", but in fact you've picked a raid method or stripe size that is going to destroy your performance under real world load conditions without even knowing it.
    Phoenix Dedicated Servers -- IOFLOOD.com
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  35. #35
    Join Date
    Mar 2011
    Location
    Rochester,NY
    Posts
    18
    1073741824 bytes (1.1 GB) copied, 3.98475 seconds, 269 MB/s

  36. #36
    Join Date
    Jan 2011
    Location
    Varna, Bulgaria
    Posts
    1,270
    # dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
    16384+0 records in
    16384+0 records out
    1073741824 bytes (1.1 GB) copied, 0.619431 seconds, 1.7 GB/s

    tmpfs on a machine with a lot of ram

  37. #37
    Join Date
    Jul 2010
    Location
    United Kingdom
    Posts
    205
    Software RAID1 on 4 x 1.5TB SATA.

    1073741824 bytes (1.1 GB) copied, 2.10587 seconds, 462 MB/s

  38. #38
    Join Date
    Jun 2000
    Location
    Washington, USA
    Posts
    5,991
    1 x Hitachi HDS72101 (7200rpm SATA) in an Atom box

    [[email protected] ~]# dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
    16384+0 records in
    16384+0 records out
    1073741824 bytes (1.1 GB) copied, 12.6502 seconds, 84.9 MB/s

  39. #39
    146GBx2 15k SAS raid1 3aware controller

    16384+0 records in
    16384+0 records out
    1073741824 bytes (1.1 GB) copied, 14.8653 seconds, 72.2 MB/s

  40. #40
    What does this command do?.. I see it copies something to somewhere, but after it finish, have I to do something? I want to test it on a small vps where I host my php projects

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