6 Replies Latest reply on Sep 16, 2008 9:04 AM by btone

    VMWare Server Disk Performance

    Maniac0Maniac Novice

      Hi Guys... This one has me completely stumped!

       

      Upgraded from VMWare Server to VMWare Server 2 beta (on a Suse Linux 11.0 Host), and now my guest disk speed has slowed down to a crawl. I've done all the usual tweaks, even mounted the disks with noatime!

       

      I can't seem to get more than 10mb/s transfer rates from my Guest OS drives, but have no problem getting 50mb/s and more on the same drives from the Host OS? I've tried the virtual disks as both IDE and SATA, but they are basically the same. I've even checked swap file usage, but the swap files on the Host and the Guest are not even being used, The speed tests are below.

       

      The normal forum search and Google'ing turned up empty.

       

      Any help will be much appreciated.

       

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      On the HOST:-----

      hdparm -t /dev/sdb --> Timing buffered disk reads:  256 MB in  3.01 seconds =  85.08 MB/sec    ---> Good!

      hdparm -T /dev/sdb --> Timing cached reads:   1720 MB in  2.00 seconds = 860.22 MB/sec        ---> Good!

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      On the GUEST:-----

      hdparm -t /dev/sdb -->  Timing buffered disk reads:  34 MB in  3.09 seconds =  11.01 MB/sec    ---> BAD!

      hdparm -T /dev/sdb --> Timing cached reads:   1326 MB in  2.00 seconds = 663.07 MB/sec      ---> Hmmm... OK