[OmniOS-discuss] Slow zfs writes

[Ram Chander]

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
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