# [OmniOS-discuss] Slow zfs writes

Eric Sproul esproul at omniti.com
Mon Feb 11 11:36:37 EST 2013

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    You still haven't said how you know that performance has dropped 30x.
    Where are the numbers?

    On Mon, Feb 11, 2013 at 11:33 AM, Ram Chander <ramquick at gmail.com> wrote:
    > I am not sure what happened on Jan 5. I havent run scrub or replaced devices
    > for more than 3 months. The underlying hardware is Dell Md1200 which has 48
    > disks.
    > How to recover from this ? I had tried rebooting  but issue comes back.
    >
    >
    > On Mon, Feb 11, 2013 at 8:14 PM, Eric Sproul <esproul at omniti.com> wrote:
    >>
    >> On Mon, Feb 11, 2013 at 7:48 AM, Ram Chander <ramquick at gmail.com> wrote:
    >> > 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.
    >>
    >> How have you measured this 30x drop in performance?  You haven't
    >> provided any data.
    >>
    >>
    >> > 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
    >>
    >> I wouldn't worry about errors here.  This is a virtual device provided
    >> by your server's lights-out management system.
    >>
    >>
    >> > 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-HC
    >> > for
    >> >               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'.
    >>
    >> What has happened since January 5?  The pool appears fine now.  Did
    >> you run a scrub?  Replace devices?  Reboot?  It looks like ZFS
    >> encountered an underlying problem with the hardware.
    >>
    >> Eric
    >> _______________________________________________
    >> OmniOS-discuss mailing list
    >> OmniOS-discuss at lists.omniti.com
    >> http://lists.omniti.com/mailman/listinfo/omnios-discuss
    >
    >

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