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

Daniel O'Connor doconnor at gsoft.com.au
Fri Dec 18 09:57:22 UTC 2009

On Fri, 18 Dec 2009, Phil Murray wrote:
> >> May be a problem is in ata? WD15EADS is a "green" series of
> >> drives.
> >
> > The WD green drives have a feature called Time Limited Error
> > Recovery where the disk can spend several minutes trying to read a
> > bad block etc.
> >
> > It plays havoc with RAID arrays which is why WD recommend you don't
> > use the green drives in arrays. They have more info about the
> > "feature" in the WD FAQ/knowledgebase
> Sorry, TLER is the feature that 'fixes' the problem, see:
> http://wdc.custhelp.com/cgi-bin/wdc.cfg/php/enduser/std_adp.php?p_faq
> Sounds like your drive is going into the recovery procedure...

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 

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.

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
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