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Date:      Fri, 18 Dec 2009 20:27:03 +1030
From:      "Daniel O'Connor" <doconnor@gsoft.com.au>
To:        freebsd-current@freebsd.org
Cc:        Alexander Zagrebin <alexz@visp.ru>, Phil Murray <pmurray@nevada.net.nz>
Subject:   Re: 8.0-RELEASE: disk IO temporarily hangs up (ZFS or ATA related problem)
Message-ID:  <200912182027.11632.doconnor@gsoft.com.au>
In-Reply-To: <6FAA390A-1E40-4D7A-AAD5-DC72578CE974@nevada.net.nz>
References:  <39309F560B98453EBB9AEA0F29D9D80E@vosz.local> <4C1C2598-4157-4B04-8DB8-C84F353AB8B8@nevada.net.nz> <6FAA390A-1E40-4D7A-AAD5-DC72578CE974@nevada.net.nz>

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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
>id=3D1397&p_created=3D1131638613&p_sid=3DvfyE1KPj&p_accessibility=3D0&p_re=
dire
>ct=3D&p_srch=3D1&p_lva=3D&p_sp=3DcF9zcmNoPTEmcF9zb3J0X2J5PSZwX2dyaWRzb3J0P=
SZwX
>3Jvd19jbnQ9MTcsMTcmcF9wcm9kcz0yMjcsMjk0JnBfY2F0cz0mcF9wdj0yLjI5NCZwX2N
>2PSZwX3BhZ2U9MSZwX3NlYXJjaF90ZXh0PXJhaWQ!&p_li=3D&p_topview=3D1
>
>
> 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=20
see the same issue.

It strikes me as extremely unlikely that both of us would have dud=20
disks..

In any case it seems to be a general problem not limited to one area of=20
the disk so a dud sector is an unlikely reason.

=2D-=20
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

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