Date: Tue, 18 May 2010 15:55:59 +0100 From: Matthew Seaman <m.seaman@infracaninophile.co.uk> To: Doug Poland <doug@polands.org> Cc: questions@freebsd.org Subject: Re: Interpretting 3Ware error messages Message-ID: <4BF2AA7F.9090503@infracaninophile.co.uk> In-Reply-To: <f889b374b170eba47ff5f7d530a9c878.squirrel@email.polands.org> References: <f889b374b170eba47ff5f7d530a9c878.squirrel@email.polands.org>
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On 18/05/2010 15:43:25, Doug Poland wrote:
> Hello,
>
> I have a 7.2-R i386 system running a 3ware 9500S-4LP SATA 150
> controller with 4 SATA drives. I recently starting seeing the
> following in my logs....
>
> smartd[906]: Device: /dev/twa0 [3ware_disk_00], 1 Currently unreadable
> (pending) sectors
> smartd[906]: Device: /dev/twa0 [3ware_disk_00], 1 Offline
> uncorrectable sectors
>
> Using the twi_cli program, I can examine the disk subsystem, but I do
> not see any issues with an underlying drive.
>
> Unit UnitType Status %RCmpl %V/I/M Port Stripe Size(GB)
> ------------------------------------------------------------------------
> u0 RAID-10 OK - - - 64K 298.002
> u0-0 RAID-1 OK - - - - -
> u0-0-0 DISK OK - - p2 - 149.001
> u0-0-1 DISK OK - - p3 - 149.001
> u0-1 RAID-1 OK - - - - -
> u0-1-0 DISK OK - - p0 - 149.001
> u0-1-1 DISK OK - - p1 - 149.001
>
>
> I suspect a disk problem, but cannot identify the individual disk or
> the nature of the problem. Can anyone shed some light on this?
>
>
Look at the SMART data for the disk(s) -- my guess is that you're seeing
sectors failing and being re-mapped by the drive firmware. If this is
happening to any significant extent the disk may well be reaching the
end of its usable life: happily you would seem to have been alerted to
that in time to do something about it without needing to run around in a
blind panic.
There's a background task you can set up on 3ware controllers that will
attempt to access all sectors of a disk specifically to bring to light
problems like this, which otherwise could go unnoticed for a long time
and lead to silent data corruption.
Cheers,
Matthew
- --
Dr Matthew J Seaman MA, D.Phil. 7 Priory Courtyard
Flat 3
PGP: http://www.infracaninophile.co.uk/pgpkey Ramsgate
Kent, CT11 9PW
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