Visit Open-E website
Results 1 to 7 of 7

Thread: DSS 6.0up98.8101.7337 64bit with ESXi 5.0.0 degraded performance

  1. #1
    Join Date
    Sep 2010
    Location
    Albury, New South Wales, Australia, Earth
    Posts
    40

    Unhappy DSS 6.0up98.8101.7337 64bit with ESXi 5.0.0 degraded performance

    Hi All,

    Help, I'm seem to have an issue withe my DSS Setup.

    I have 2 DSS machines in a fail over configuration.

    Since upgrading to ESXi 5.0.0 I've had nothing but issues with I/O.
    My environment was running smooth on ESXi 4.1 but since upgrading to 5.0.0 I'm having some very bad latency issues.

    I have 6 Ethernet ports in each of my DSS SANS.
    eth0 = management port (purely web interface etc)
    eth1 -> directly connected to eth1 on SAN2 (this is my replication nic)
    eth2 through eth5 are shared across 2 switches.
    eth2 - eth4 go to switch 1, eth3, eth5 go to switch 2.

    My switches are connected via a 4 port trunk/lacp.

    I think the issue I'm having is with the replication slowing down things, if I shutdown my passive node the I/O seems to stabilize and I don't have an issue. But when in full failover configuration I get degraded (border line VM guests dying I/O).
    I have a 4 node server as my VM host with only around 36-40 VM's.

    Does any one have advise on tracking down whats going on. The graphs don't show much traffic at all over the replication port.

    Cheers
    Adam

  2. #2
    Join Date
    Aug 2010
    Posts
    404

    Default

    What is your RAID controller mode/type ? and are you enabling the Write Cache or not? ( try the opposite, if you are turning it on then try to turn it off or turn it on if it's already off).

  3. #3
    Join Date
    Sep 2010
    Location
    Albury, New South Wales, Australia, Earth
    Posts
    40

    Default

    My RAID cards are

    LSI Logic / Symbios Logic MegaRAID SAS 2108 [Liberator] (rev 04)
    They are Supermicro AOC-USAS2LP-H8iR (which are an LSI 2108-8port PCI-e SAS-2 controller).

    I have just replaced the BBU units and they are charging as we speak (these went bad about a week after I noticed I/O issues).
    I'm running RAID10. Write policy is Write-Back (but it's in Write-through mode due to BBU charging) could this have the big an impact on I/O?

    Read Policy: Read Ahead
    Access Policy: Read-Write
    Cache Policy: Direct
    Disk cache Policy: Disabled

    Do I change any of these settings?

    Cheers
    Ad

  4. #4
    Join Date
    Aug 2010
    Posts
    404

    Default

    Try to enable the Disk Cache, and if you have a CacheCade option in the card, try to disable it's options and see.
    Also is your LSI running with the latest Firmware? if yes try to downgrade it to the previous Firmware for LSI.

  5. #5
    Join Date
    Sep 2010
    Location
    Albury, New South Wales, Australia, Earth
    Posts
    40

    Default

    I had just upgraded to the latest version of DSS today.

    I can't seem to connect to the LSI controller via the MegaRAID Storage manager, is there a setting I need to enable in DSS to allow the manager to connect?

    Cheers
    Adam

  6. #6
    Join Date
    Sep 2010
    Location
    Albury, New South Wales, Australia, Earth
    Posts
    40

    Default

    Quote Originally Posted by Al-S View Post
    Try to enable the Disk Cache, and if you have a CacheCade option in the card, try to disable it's options and see.
    Also is your LSI running with the latest Firmware? if yes try to downgrade it to the previous Firmware for LSI.
    Hi,

    No CacheCade,

    The firmware is 2.120.53-1235

    Do I have to be concerned with possible data loss enabling the Disk Cache? or is that negligible in my setup? BBU + Duel power supplies + A+B Power feed, also including the secondary SAN?

  7. #7

    Default

    If the BBU is charging it will be in a Write Through state thus being slower, wait till the BBU is fully charged then test again.
    All the best,

    Todd Maxwell


    Follow the red "E"
    Facebook | Twitter | YouTube

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •