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Thread: Slow.......

  1. #1

    Default Slow.......

    Hello,

    We have a Xenserver 6.2 with all patches setup with redundant switches and active/active open-e and 4x1Gbit Multipath setup.

    Xenserver 4x1GB > 2 switches 2x2 paths > open-e node 4 x1Gbit cards)

    We have in multipath.conf:

    device {
    vendor "SCST_FIO|SCST_BIO"
    product "*"
    path_selector "round-robin 0"
    path_grouping_policy multibus
    rr_min_io 100
    }

    We see in statistics of the two open-e nodes between 100-180Mbit traffic per network card and we have 4 in them... We also experience some slow performance during backup times...

    Shouldn't the Open-e server in there statistics show 4 cards with 800-900Mbits of trafic? It feels that the Xenservers 6.2 are using 1GBit over 4 links? (4 cards on open-e times 200Mbit max = 800Mbit.)

    Can some one please enlighten us?

    as addition we never saw more then 100MB/s disk speed with dd test uncached
    Last edited by westm003; 02-28-2015 at 04:47 PM.

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

    Default

    You might try tuning the targets themselves:
    1. From the console, press CTRL+ALT+W,
    2. Select Tuning options -> iSCSI daemon options -> Target options,
    3. Select the target in question,
    4. change the values to the maximum required data size (check w/ the initiator to match in iscsi.conf file for linux).

    maxRecvDataSegmentLen=262144
    MaxBurstLength= 1048576
    Maxxmitdatasegment=262144
    FirstBurstLength=65536
    DataDigest=None
    maxoutstandingr2t=8
    InitialR2T=No
    ImmediateData=Yes
    headerDigest=None
    (deprecated)Wthreads=8

    Also for best performance, attach only a single LUN per target.

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