Date: Fri, 7 Nov 2003 20:47:57 -0800 From: Kris Kennaway <kris@obsecurity.org> To: "Andrew P. Lentvorski, Jr." <bsder@allcaps.org> Cc: sos@FreeBSD.org Subject: Re: Too many uncorrectable read errors with atang Message-ID: <20031108044757.GA1387@xor.obsecurity.org> In-Reply-To: <20031107202526.S532@mail.allcaps.org> References: <XFMail.20031107140654.jhb@FreeBSD.org> <20031107202526.S532@mail.allcaps.org>
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--MGYHOYXEY6WxJCY8 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Fri, Nov 07, 2003 at 08:36:28PM -0800, Andrew P. Lentvorski, Jr. wrote: > On Fri, 7 Nov 2003, John Baldwin wrote: >=20 > > On 07-Nov-2003 Kris Kennaway wrote: > > > So far this has happened (well, the panic above was new) on 5 separate > > > machines that were all working on older -current. Now, these are all > > > IBM DeathStar drives, but previously I was only experiencing ata > > > errors every month or two, and they were correctable for another month > > > or two by /dev/zero'ing the drive. >=20 > IBM Deathstar's have this annoying tendency to perform thermal > recalibration cycles that cause them to delay returning data for somewhere > between 30-90 seconds until the calibration finishes. Unfortunately, > these seem to show up as uncorrectable errors. It's a true pain with RAID > cards as the RAID array will take the drive offline when it could retry > the data. >=20 > If you can, try to reduce the temperature of the drives. This generally > helped my Deathstars before I got rid of them all. >=20 > Also, given the touchiness of PRML detectors, it is entirely possible that > the drive is reading increased errors due to the solar flares as a need to > thermally recalibrate more often. >=20 > Other than tossing the drives, ATAng, like Windows, would have to be more > aggressive about retrying even uncorrectable errors for up to a minute or > so before giving up. Thanks..that's interesting, perhaps there's something sos can do here. Unfortunately the drives in question are in Yahoo's datacenter, so I do not have physical access. Kris --MGYHOYXEY6WxJCY8 Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.3 (FreeBSD) iD8DBQE/rHV9Wry0BWjoQKURAt93AJ4zHrIyHAK/dFX5qZN/sF99CCUosQCfZ5u8 3ACuVW8aTBA+RXZ8EbVLbyM= =Sh0v -----END PGP SIGNATURE----- --MGYHOYXEY6WxJCY8--
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