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Date:      Wed, 18 Nov 2009 10:13:52 +0800
From:      TJ Varghese <tj@tjvarghese.com>
To:        Modulok <modulok@gmail.com>
Cc:        freebsd-questions@freebsd.org
Subject:   Re: Wester Digital 'deep recovery cycle' and gstripe?
Message-ID:  <c7f2adc20911171813o5c90bf15o51b3fe5bbd1b6e34@mail.gmail.com>
In-Reply-To: <64c038660911171249r141cc810n62a721e48225954c@mail.gmail.com>
References:  <64c038660911171249r141cc810n62a721e48225954c@mail.gmail.com>

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On Wed, Nov 18, 2009 at 4:49 AM, Modulok <modulok@gmail.com> wrote:
> List,
>
> Has anyone used 'Wester Digital Caviar Black' disks in a gstripe?
>
> I'm building a 2TB gstripe, from 3x 1TB disks. My concern, is the
> disks are 'consumer grade' disks. Western Digital mention not to use
> them with a raid controller as they have a potential, 'deep recovery
> cycle', which an last up to 2 minutes. This would theoretically result
> in them being dropped from the array. Despite this, I've heard
> successful uses of these disks via gmirror. (Granted, not the same as
> gstripe). Again, in theory, if one disk enters a 'deep recovery cycle'
> and is dropped from the array, and during that time another disks does
> the same the array is toast, right?
>
> Umm...what are the odds of this occurring? War stories? (The more I
> type this out, the more it's starting to sound like a bad idea.)
> Thoughts, ideas?
> -Modulok-

google for WDTLER.EXE. I've had good results setting the recovery time
to 7 seconds on the Caviar Greens & Blacks. FWIH, it only works up for
WD drives up to 1TB. WD's Raid Ed. drives have the above setting on by
default.



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