# [OmniOS-discuss] Slow zfs writes

Ram Chander ramquick at gmail.com
Mon Feb 11 07:48:52 EST 2013

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    Hi,

    My OI box is expreiencing slow zfs writes ( around 30 times slower ).
    iostat reports below error though pool is healthy. This is happening in
    past 4 days though no change was done to system. Is the hard disks faulty ?
    Please help.

    # zpool status -v
    root at host:~# zpool status -v
      pool: test
     state: ONLINE
    status: The pool is formatted using a legacy on-disk format.  The pool can
            still be used, but some features are unavailable.
    action: Upgrade the pool using 'zpool upgrade'.  Once this is done, the
            pool will no longer be accessible on software that does not support
    feature flags.
    config:

            NAME         STATE     READ WRITE CKSUM
            test       ONLINE       0     0     0
              raidz1-0   ONLINE       0     0     0
                c2t0d0   ONLINE       0     0     0
                c2t1d0   ONLINE       0     0     0
                c2t2d0   ONLINE       0     0     0
                c2t3d0   ONLINE       0     0     0
                c2t4d0   ONLINE       0     0     0
              raidz1-1   ONLINE       0     0     0
                c2t5d0   ONLINE       0     0     0
                c2t6d0   ONLINE       0     0     0
                c2t7d0   ONLINE       0     0     0
                c2t8d0   ONLINE       0     0     0
                c2t9d0   ONLINE       0     0     0
              raidz1-3   ONLINE       0     0     0
                c2t12d0  ONLINE       0     0     0
                c2t13d0  ONLINE       0     0     0
                c2t14d0  ONLINE       0     0     0
                c2t15d0  ONLINE       0     0     0
                c2t16d0  ONLINE       0     0     0
                c2t17d0  ONLINE       0     0     0
                c2t18d0  ONLINE       0     0     0
                c2t19d0  ONLINE       0     0     0
                c2t20d0  ONLINE       0     0     0
                c2t21d0  ONLINE       0     0     0
                c2t22d0  ONLINE       0     0     0
                c2t23d0  ONLINE       0     0     0
              raidz1-4   ONLINE       0     0     0
                c2t24d0  ONLINE       0     0     0
                c2t25d0  ONLINE       0     0     0
                c2t26d0  ONLINE       0     0     0
                c2t27d0  ONLINE       0     0     0
                c2t28d0  ONLINE       0     0     0
                c2t29d0  ONLINE       0     0     0
                c2t30d0  ONLINE       0     0     0
              raidz1-5   ONLINE       0     0     0
                c2t31d0  ONLINE       0     0     0
                c2t32d0  ONLINE       0     0     0
                c2t33d0  ONLINE       0     0     0
                c2t34d0  ONLINE       0     0     0
                c2t35d0  ONLINE       0     0     0
                c2t36d0  ONLINE       0     0     0
                c2t37d0  ONLINE       0     0     0
              raidz1-6   ONLINE       0     0     0
                c2t38d0  ONLINE       0     0     0
                c2t39d0  ONLINE       0     0     0
                c2t40d0  ONLINE       0     0     0
                c2t41d0  ONLINE       0     0     0
                c2t42d0  ONLINE       0     0     0
                c2t43d0  ONLINE       0     0     0
                c2t44d0  ONLINE       0     0     0
            spares
              c5t10d0    AVAIL
              c5t11d0    AVAIL
              c2t45d0    AVAIL
              c2t46d0    AVAIL
              c2t47d0    AVAIL

    # iostat -En

    c4t0d0           Soft Errors: 0 Hard Errors: 5 Transport Errors: 0
    Vendor: iDRAC    Product: Virtual CD       Revision: 0323 Serial No:
    Size: 0.00GB <0 bytes>
    Media Error: 0 Device Not Ready: 5 No Device: 0 Recoverable: 0
    Illegal Request: 1 Predictive Failure Analysis: 0
    c3t0d0           Soft Errors: 0 Hard Errors: 0 Transport Errors: 0
    Vendor: iDRAC    Product: LCDRIVE          Revision: 0323 Serial No:
    Size: 0.00GB <0 bytes>
    Media Error: 0 Device Not Ready: 0 No Device: 0 Recoverable: 0
    Illegal Request: 0 Predictive Failure Analysis: 0
    c4t0d1           Soft Errors: 0 Hard Errors: 0 Transport Errors: 0
    Vendor: iDRAC    Product: Virtual Floppy   Revision: 0323 Serial No:
    Size: 0.00GB <0 bytes>
    Media Error: 0 Device Not Ready: 0 No Device: 0 Recoverable: 0

    root at host:~# fmadm faulty
    --------------- ------------------------------------  --------------
    ---------
    TIME            EVENT-ID                              MSG-ID
    SEVERITY
    --------------- ------------------------------------  --------------
    ---------
    Jan 05 08:21:09 7af1ab3c-83c2-602d-d4b9-f9040db6944a  ZFS-8000-HC
    Major

    Host        : host
    Platform    : PowerEdge-R810
    Product_sn  :

    Fault class : fault.fs.zfs.io_failure_wait
    Affects     : zfs://pool=test
                      faulted but still in service
    Problem in  : zfs://pool=test
                      faulted but still in service

    Description : The ZFS pool has experienced currently unrecoverable I/O
                        failures.  Refer to http://illumos.org/msg/ZFS-8000-HCfor
                  more information.

    Response    : No automated response will be taken.

    Impact      : Read and write I/Os cannot be serviced.

    Action      : Make sure the affected devices are connected, then run
                        'zpool clear'.

    Regards,
    Ram
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