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  1. #1

    VPS Disk I/O test

    I'm new to the VPS scene. I just bought a VPS(OpenVZ) from PhotonVPS and decided to test it first one being the disk. What can you guys make of this result?

    [root@vps ~]# 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, 84.3708 seconds, 12.7 MB/s

    I tested it at a different times and best I got was 17MB/s. Is this speed reasonable?

  2. #2
    Join Date
    Apr 2004
    Location
    Singapore
    Posts
    1,498
    For your reference:

    My First VPS
    RAID 1
    [svr2:/root]# 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, 15.0042 seconds, 71.6 MB/s
    My Second VPS
    RAID-10
    [root@xen01 ~]# 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, 3.1535 seconds, 340 MB/s

  3. #3
    Join Date
    Nov 2009
    Location
    Malaysia
    Posts
    153
    Quote Originally Posted by andr3w4u View Post
    I'm new to the VPS scene. I just bought a VPS(OpenVZ) from PhotonVPS and decided to test it first one being the disk. What can you guys make of this result?

    [root@vps ~]# 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, 84.3708 seconds, 12.7 MB/s

    I tested it at a different times and best I got was 17MB/s. Is this speed reasonable?
    Please contact your provider, anything below 20MB/s is really unusual ..

  4. #4
    Quote Originally Posted by seikan View Post
    Please contact your provider, anything below 20MB/s is really unusual ..
    I had contacted PhotonVPS once but no difference!.

    I still get 15-20 MB/s.

  5. #5
    Join Date
    Nov 2010
    Location
    UK
    Posts
    43
    What dis they say when you contacted them. Did they awknowlwdge the problem or givd you any sort of explanation?

  6. #6
    Join Date
    Mar 2008
    Location
    Suffolk, England.
    Posts
    646
    Something's definitely not right there, I've just run this on a personal testing VPS hosted on one of our busy nodes and received the following result:


    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, 5.46038 s, 197 MB/s


    I would definitely contact your provider and see what's going on!

  7. #7
    Quote Originally Posted by seikan View Post
    Please contact your provider, anything below 20MB/s is really unusual ..
    I have contacted them, they kept telling me everything's fine or that they fixed it but I always kept getting under 20 MB/s. They switched me to another node and it was worse than the last, I told them about it and they said it was fine I even asked to try another node with no answer back from them yet.

    What should I do?

    Oh also this is on a RAID 10 setup.
    Last edited by andr3w4u; 12-05-2010 at 11:20 AM.

  8. #8
    Join Date
    Oct 2010
    Posts
    151
    Interesting. Their YardVPS ($15/year OpenVZ plan) performs better than PhotonVPS plans?

    1073741824 bytes (1.1 GB) copied, 17.367 seconds, 61.8 MB/s

  9. #9
    Quote Originally Posted by skoh View Post
    Interesting. Their YardVPS ($15/year OpenVZ plan) performs better than PhotonVPS plans?

    1073741824 bytes (1.1 GB) copied, 17.367 seconds, 61.8 MB/s
    Oh wow I must be part of the unlucky bunch. It's supposed to be Raid 10 with "Enterprise Western Digital Hard Drives".

  10. #10
    Join Date
    Jun 2003
    Location
    Los Angeles, CA
    Posts
    1,324
    There is something wrong here, do you have a ticket number that I can look in to?

  11. #11
    ticket id is 608617

  12. #12
    I have a Leaf 6 plan with YardVPS and, while it worked great at first, after a couple weeks I never once saw speeds faster than 18 - 20 MB/s using the exact same dd test as you performed, and often had speeds below 15.

    I raised a ticket with them and was repeatedly ignored until I asked if upgrading to a Xen plan would offer better performance. I was told that I "should see an overall performance increase" if I did so, but that they were currently sold out and were awaiting new hardware. When I asked if there was anything that could be done in the meantime, I was told "YardVPS is our budget brand and you will not experience the best possible performance from this brand."

    At this point I zipped up all my files and moved to a new provider. It's just a matter of cancelling my account with YardVPS now. Hopefully that goes a little easier than the support process.

    PhotonVPS-Jim: If you'd like to investigate this issue, my Ticket ID number is SRT-496805. It's a shame that it had to come to me cancelling, as when the service worked, it worked really, really well.
    Last edited by ehushagen; 12-05-2010 at 09:31 PM.

  13. #13
    Join Date
    May 2007
    Posts
    1,905
    yardvps

    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, 4.59436 seconds, 234 MB/s

  14. #14
    Quote Originally Posted by ehushagen View Post
    I have a Leaf 6 plan with YardVPS and, while it worked great at first, after a couple weeks I never once saw speeds faster than 18 - 20 MB/s using the exact same dd test as you performed, and often had speeds below 15.

    I raised a ticket with them and was repeatedly ignored until I asked if upgrading to a Xen plan would offer better performance. I was told that I "should see an overall performance increase" if I did so, but that they were currently sold out and were awaiting new hardware. When I asked if there was anything that could be done in the meantime, I was told "YardVPS is our budget brand and you will not experience the best possible performance from this brand."

    At this point I zipped up all my files and moved to a new provider. It's just a matter of cancelling my account with YardVPS now. Hopefully that goes a little easier than the support process.

    PhotonVPS-Jim: If you'd like to investigate this issue, my Ticket ID number is SRT-496805. It's a shame that it had to come to me cancelling, as when the service worked, it worked really, really well.
    Seems like we're in the same boat the only difference being that I'm not with their budget brand. I'm still waiting on PhotonVPS-Jim to contact me. I'm giving a chance before I consider canceling. Thanks to those that posted their disk speed test result I envy you guys .

  15. #15
    Join Date
    Sep 2010
    Location
    /usr/bin/fail
    Posts
    857
    I am also seeing slow speeds on PhotonVPS. I am on a BEAM1 plan.


    root@ns2 [~]# 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, 48.9655 seconds, 21.9 MB/s

    Even though is not a big issue as it is only used as a secondary DNS server so its low impact.


    @Jim Here is my ticket number 431828 just to help track the issue down..
    Last edited by FLDataTeK; 12-06-2010 at 12:08 AM.

  16. #16
    Join Date
    Jun 2003
    Location
    Los Angeles, CA
    Posts
    1,324
    andr3w4u -

    The issue should be resolved. There was an user spamming that was causing all IO usage. There will be occasional spike due to our system doing its backups.


    ehushagen -

    The node you were on had a degraded array that was suffering through performance issues while it rebuilds. This is unexpected but no data lost was suffered during this degradation.


    JeremyXL -

    The node you were on had cache write off due it being on a legacy system. We'll be migrating this raid through out the weeks. However currently write cache is on. However we'll be making it more optimal.



    We monitor our nodes regularly but due to IO priority on OpenVZ some will have lower priority vs those who gain a 200MB/s which are on Xen. If any one has performance issues we advise you to open a ticket with us and work with our Level 3 engineers for a resolution.

  17. #17
    Join Date
    Sep 2010
    Location
    /usr/bin/fail
    Posts
    857
    Thanks Jim.. Yes there is indeed an increase after they modified it.. Here is the same test on the same vps..

    root@ns2 [~]# 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, 17.7395 seconds, 60.5 MB/s


    So almost 3x increase in performance..

    Thank you for your wonderful service and quick resolution..

  18. #18
    Here's mine

    DMEHosting (Denver)
    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, 19.7884 seconds, 54.3 MB/s
    DMEHosting (Chicago)
    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, 17.3874 seconds, 61.8 MB/s
    ThrustVPS (Los Angeles)
    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, 23.1792 seconds, 46.3 MB/s

  19. #19
    Join Date
    Apr 2009
    Posts
    50
    Hello

    Sorry, i'm noob and here's my result

    dd if=/dev/zero of=test bs=16k count=4k conv=fdatasync
    4096+0 records in
    4096+0 records out
    67108864 bytes (67 MB) copied, 4.82657 seconds, 13.9 MB/s

    Same question, is this speed reasonable? ( my vps at alienvps )

  20. #20
    Join Date
    Sep 2002
    Location
    Chicago, Illinois
    Posts
    882
    Quote Originally Posted by WebHostX View Post
    Hello

    Sorry, i'm noob and here's my result

    dd if=/dev/zero of=test bs=16k count=4k conv=fdatasync
    4096+0 records in
    4096+0 records out
    67108864 bytes (67 MB) copied, 4.82657 seconds, 13.9 MB/s

    Same question, is this speed reasonable? ( my vps at alienvps )
    That is a bit low, but not absolutely terrible. If your applications are working without problems then there really isn't cause for concern.

  21. #21
    Join Date
    Apr 2009
    Posts
    50
    Thanks for your advice

  22. #22
    Join Date
    Mar 2010
    Location
    Florida
    Posts
    112
    Well I just ran it on my machine and I think your numbers are way off.

    16384+0 records in
    16384+0 records out
    1073741824 bytes (1.1 GB) copied, 3.40199 s, 301 MB/s
    matt@cs16fl:~$

  23. #23
    Join Date
    Mar 2010
    Posts
    4,487
    Quote Originally Posted by WebHostX View Post
    Hello

    Sorry, i'm noob and here's my result

    dd if=/dev/zero of=test bs=16k count=4k conv=fdatasync
    4096+0 records in
    4096+0 records out
    67108864 bytes (67 MB) copied, 4.82657 seconds, 13.9 MB/s

    Same question, is this speed reasonable? ( my vps at alienvps )
    Anything under 40-50 MB/s in my opinion is unreasonable. Of course multiple write speeds are more important then a single file.

  24. #24
    Code:
    [root@www ~]# dd if=/dev/zero of=test bs=64k count=4k conv=fdatasync
    4096+0 records in
    4096+0 records out
    268435456 bytes (268 MB) copied, 11.0193 seconds, 24.4 MB/s

    I am on simba. Jim, is there anything you can do?

    There is an old Ticket #602658 I had raised for the same reason.

  25. #25
    Join Date
    Mar 2009
    Location
    Austin, TX
    Posts
    934
    Quote Originally Posted by WebHostX View Post
    Hello

    Sorry, i'm noob and here's my result

    dd if=/dev/zero of=test bs=16k count=4k conv=fdatasync
    4096+0 records in
    4096+0 records out
    67108864 bytes (67 MB) copied, 4.82657 seconds, 13.9 MB/s

    Same question, is this speed reasonable? ( my vps at alienvps )
    I think you are ok when compared to my AlienVPS VPS...


    $ dd if=/dev/zero of=test bs=16k count=4k conv=fdatasync
    4096+0 records in
    4096+0 records out
    67108864 bytes (67 MB) copied, 8.61845 s, 7.8 MB/s

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