[OmniOS-discuss] Slow zfs writes

[Ram Chander]

cp of 1Gb file takes 20min  to the pool whereas on normal disk it takes
35sec.


On Mon, Feb 11, 2013 at 10:06 PM, Eric Sproul <esproul at omniti.com> wrote:

> 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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