8.0-RELEASE: disk IO temporarily hangs up (ZFS or ATA related
alexz at visp.ru
Fri Dec 18 11:48:48 UTC 2009
> >> I doubt this is the problem, I have WD10EADS disks in my ZFS
> >> array and I
> >> see the same issue.
> >> It strikes me as extremely unlikely that both of us would have dud
> >> disks..
> >> In any case it seems to be a general problem not limited to
> >> one area of
> >> the disk so a dud sector is an unlikely reason.
> > Big thanks for confirmation!
> > Your confirmation is important for me.
> > There should be a way to define where the bug is: in the
> ata (or filesystem)
> > driver or in the drive's firmware....
> Just another 'me too'.
> >From the moment I started using zfs and till this day I saw
> this pattern when
> writing lots data to zfs - first high throughput and then
> idle pause, and so on.
May be it usual write caching? See gstat or iostat output.
At my case gstat shows abnormal value of %busy (usually approx. 180%)
and very long ms/r and ms/w.
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