[OmniOS-discuss] Slow zfs writes

[Ram Chander]

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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