Seagate disk problems (NCQ bug???)
Wolfgang S. Rupprecht
wolfgang.rupprecht+gnus200905 at gmail.com
Mon May 11 18:52:37 UTC 2009
"D. Hugh Redelmeier" <hugh at mimosa.com> writes:
> I infer that Seagate generally doesn't disclose problems or even
> fixes. You have to report a problem to support, and perhaps even ask
> explicitly for a firmware update to be offered one.
Thanks. I'll see if I can find a way to report this to seagate. They
don't seem to make it very easy by not having a prominent support@
address that I can find documented anywhere.
Their web page had some convoluted sign up to get a seagate approved
identity. The sign up refused me enough times that I just figured it
was broken.
> If you can reliably reproduce this problem, that in itself is very
> interesting. The reports on the Seagate forum have not been very
> useful.
Well, the test case that works for me is to copy a half dozen 1GB files
from a sata dvd reader to the sata seagate disk.
It might be very kernel dependent though. I hadn't seen the disk act up
before a few weeks ago. It also takes hours for the system to wedge up
solidly. This isn't going to be a fun bug for Seagate to find.
> You didn't explain why you thought that the problem is related to NCQ.
> Have you seen reports of NCQ problems?
I don't know that it is NCQ related, only that other reports of similar
lockups under streaming conditions claimed it was related to a known
Seagate bug related to their NCQ implementation. I might be
misremembering or misunderstanding though...
> This FAQ claims to tell you how to turn off NCQ:
> http://linux-ata.org/faq.html
Thanks! Will try that and see if the problem goes away.
> Do consider doing a S.M.A.R.T. scan of the drive. I've found that
> bad blocks can do odd things to disk behaviour.
I do a nightly long test. No grown errors and no pending errors.
-wolfgang
--
Wolfgang S. Rupprecht http://www.full-steam.org/ (ipv6-only)
You may need to config 6to4 to see the above pages.
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