[ale] Which large capacity drives are you having the best luck with?

[Greg Freemyer]

TLER is unrelated to head parking, so I doubt storage-fixup has
anything in it related to TLER.

fyi: Anyone using WD in a raid setup should adjust the TLER time down
to something fairly small.

Greg

On Wed, Dec 22, 2010 at 11:56 AM, Matty <matty91 at gmail.com> wrote:
> On Wed, Dec 22, 2010 at 11:22 AM, Greg Freemyer <greg.freemyer at gmail.com> wrote:
>> On Wed, Dec 22, 2010 at 10:56 AM, Richard Faulkner
>> <rfaulkner at 34thprs.org> wrote:
>> <snip>
>>> Question for Greg...
>>>
>>> I do not have storage-fixup.conf in FC12....neither do I see it available in
>>> package
>>> manager.  Where is a safe source to get it?
>>>
>>
>> The official repo is:
>>
>> http://git.kernel.org/?p=linux/kernel/git/tj/storage-fixup.git
>>
>> And you can look through the list of problem drives by looking at:
>>
>> http://git.kernel.org/?p=linux/kernel/git/tj/storage-fixup.git;a=blob;f=storage-fixup.conf;h=711813339730325cf3ffe4b67af45c83d7f90fbc;hb=refs/heads/master
>>
>> Lots of drives in there, but WDC seems over represented and theirs are
>> the only ones I've seen actually trigger application failure due to
>> failed writes.  (the problem is the drives in this list park the heads
>> excessively and thus can be very slow to respond to i/o activity.  If
>> it takes too long, the kernel can error out the i/o and user space is
>> often not prepared to handle a read or write failure gracefully.)
>>
>> If you have a drive in the list, then with Fedora I can't help.  (I
>> don't know how you would cause storage-fixup to be called during boot
>> and resume under Fedora.)
>>
>> (I'm surprised Fedora doesn't have this packaged.  Suse, Ubuntu, and
>> Arch all do.)
>
>
> A number of folks have also had good luck with the wdtler utility:
>
> http://en.wikipedia.org/wiki/Time-Limited_Error_Recovery
>
> Do you happen to know if the storage-fixup tool disables TLER on WD
> green drives? It appears TLER causes a fair number of issues.
>
> - Ryan
> --
> http://prefetch.net
>
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-- 
Greg Freemyer
Head of EDD Tape Extraction and Processing team
Litigation Triage Solutions Specialist
http://www.linkedin.com/in/gregfreemyer
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   http://insession.blogs.cnn.com/2010/03/23/how-computer-evidence-gets-retrieved/

The Norcross Group
The Intersection of Evidence & Technology
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