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Thread: Slow replication speed with 10G

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  1. #1
    Join Date
    Feb 2009
    Posts
    142

    Default Slow replication speed with 10G

    Just created a new system with 10 Sata drives in a raid 10 array. Have a Myricom 10g link point-to-point (no switch) with my second DSS for replication. Jumbo Frames have been enabled. Have a 2.6 tb and a 2.0 tb logical volume replication task and set both of them to 350 MB for the replication speed.

    Started the tasks and am I'm only averaging about 33MBs on each task. I have gotten better speed then that with a 1G replication link. Where do I start looking to resolve this. Was expecting much better perofrmance then this.

    Thanks!

  2. #2
    Join Date
    Oct 2010
    Location
    GA
    Posts
    935

    Default

    Look at your RAID settings, and make sure you have caching enabled all around.

  3. #3
    Join Date
    Feb 2009
    Posts
    142

    Default

    Submitted a support ticket but yes, caching enabled on both systems. Thanks!

  4. #4
    Join Date
    Feb 2009
    Posts
    142

    Default

    On an LSI 9260 controller is the cache supposed to be

    Direct
    or
    Cached

    Some of the open-e videos show it set to Direct and that what I have.

    Also wondering about this Option:

    Disk cache policy: Mine is set to "Disk's Default"

  5. #5
    Join Date
    Oct 2010
    Location
    GA
    Posts
    935

    Default

    -write policy: write-back caching
    -read policy: Adaptive <<'read ahead' can be better to force it on>>
    -Cache Policy: Cached
    -Disk cache policy: Enabled

  6. #6
    Join Date
    Feb 2009
    Posts
    142

    Default

    Hey, got it up to 200 MBs!!

    In addition to making sure the settings were set as above, I had to stop the replication tasks and restart them. It appears that once the tasks start they use whatever settings you had at the time of kickoff.

    Thanks Todd

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