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Date:      Thu, 27 Jun 2013 08:16:48 -0700
From:      Charles Swiger <cswiger@mac.com>
To:        =?utf-8?Q?Nikola_Pavlovi=C4=87?= <nzp@riseup.net>
Cc:        freebsd-questions@freebsd.org
Subject:   Re: Troubleshooting a gmirror disk marked broken
Message-ID:  <36C962B9-ABC4-45E3-AC94-46D6CEE960E1@mac.com>
In-Reply-To: <20130627023837.GA7685@sputnjik.localdomain>
References:  <20130627023837.GA7685@sputnjik.localdomain>

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Hi--

On Jun 26, 2013, at 7:38 PM, Nikola Pavlovi=C4=87 <nzp@riseup.net> =
wrote:
[ ... ]
> At the moment I'm attaching smartctl -a results for both disks (ad4 =
was
> marked broken).  As I'm completely useless in deciphering smartctl
> results (apart from being thought by experience to pretty much
> ignore(tm) the 'Pre-fail' statuses), I'd appreciate assessment from =
more
> knowledgeable people.

As Adam said, your drives haven't failed, but they are on the way out.
Pay close attention to Reallocated_Sector_Ct, especially if it starts
jumping upwards.

You might also want to check the thermals; the Seagate is running at =
52C,
which is significantly hotter than it ought to be, except for maybe a =
laptop.
I'd much rather see a drive running below 40C....

If you haven't rebuilt the mirror already, running a full disk read scan
against both drives (ie, via "dd if=3D/dev/ad4 of=3D/dev/null bs=3D1m" =
or similar)
might be prudent.  That will help identify/migrate any sectors which are
failing but still recoverable via ECC to the spare sectors.

Regards,
--=20
-Chuck




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