Date: Fri, 1 Apr 2005 11:27:47 -0500 From: "Don Bowman" <don@SANDVINE.com> To: "Uwe Doering" <gemini@geminix.org> Cc: freebsd-stable@freebsd.org Subject: RE: Adaptec 3210S, 4.9-STABLE, corruption when disk fails Message-ID: <2BCEB9A37A4D354AA276774EE13FB8C23A6939@mailserver.sandvine.com>
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From: Uwe Doering [mailto:gemini@geminix.org]=20 ... > As far as I understand this family of controllers the OS=20 > drivers aren't involved at all in case of a disk drive=20 > failure. It's strictly the controller's business to deal=20 > with it internally. The OS just sits there and waits until=20 > the controller is done with the retries and either drops into=20 > degraded mode or recovers from the disk error. >=20 > That's why I initially speculated that there might be a=20 > timeout somewhere in PostgreSQL or FreeBSD that leads to data=20 > loss if the controller is busy for too long. >=20 > A somewhat radical way to at least make these failures as=20 > rare an event as possible would be to deliberately fail all=20 > remaining old disk drives, one after the other of course, in=20 > order to get rid of them. And if you are lucky the problem=20 > won't happen with newer drives anyway, in case the root cause=20 > is an incompatibility between the controller and the old drives. Started that yesterday. I've got one 'old' one left. Sadly, the one that failed night before last was not one of the 'old' ones, so this is no guarantee :) >From the raidutil -e log, I see this type of info. I'm not sure=20 what the 'unknown' events are. The 'CRC Failure' is probably the problem? There's also Bad SCSI Status, unit attention, etc. Perhaps the driver doesn't deal with these properly? $ raidutil -e d0 03/31/2005 23:37:59 Level 1 Lock for Channel 0 : Started 03/31/2005 23:37:59 Level 1 Lock for Channel 1 : Started 03/31/2005 23:38:09 Level 1 Lock for Channel 0 : Stopped 03/31/2005 23:38:22 Level 1 Lock for Channel 1 : Stopped 03/31/2005 23:38:22 Level 4 HBA=3D0 BUS=3D0 ID=3D0 LUN=3D0 Status Change Optimal =3D> Degraded - Drive Failed 03/31/2005 23:38:22 Level 1 Unknown Event : 56 10 00 08 EE 89 4C 42 00 00 00 00=20 03/31/2005 23:38:22 Level 1 CRC Failure Number of dirty blocks =3D -1 FFFFFFFF D30A1F2A 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000=20 03/31/2005 23:38:24 Level 3 HBA=3D0 BUS=3D0 ID=3D0 LUN=3D0 Bad SCSI Status - Check Condition 28 00 00 00 00 00 00 00 01 00 00 00=20 03/31/2005 23:38:24 Level 3 HBA=3D0 BUS=3D0 ID=3D0 LUN=3D0 Request Sense 70 00 06 00 00 00 00 0A 00 00 00 00 29 02 02 00 00 00=20 Unit Attention
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