8.0-RELEASE: disk IO temporarily hangs up (ZFS or ATA related problem)

Daniel O'Connor doconnor at gsoft.com.au
Fri Dec 18 12:05:36 UTC 2009

On Fri, 18 Dec 2009, Alexander Zagrebin wrote:
> > 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....

Yes, it would be nice to track down..

The drive is not particularly fast but single threaded sequential reads 
and writes (on the array) are not unreasonable (220/300Mb/sec) so it 
seems odd the penalty for accessing a busy array is so bad (of the 
order of seconds of delay).

Daniel O'Connor software and network engineer
for Genesis Software - http://www.gsoft.com.au
"The nice thing about standards is that there
are so many of them to choose from."
  -- Andrew Tanenbaum
GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 188 bytes
Desc: This is a digitally signed message part.
Url : http://lists.freebsd.org/pipermail/freebsd-current/attachments/20091218/d7516de1/attachment.pgp

More information about the freebsd-current mailing list