Date: Fri, 29 May 1998 12:25:51 +0200 From: Eivind Eklund <eivind@yes.no> To: tcobb <tcobb@staff.circle.net>, "'freebsd-current@freebsd.org'" <freebsd-current@FreeBSD.ORG>, "'freebsd-scsi@freebsd.org'" <freebsd-scsi@FreeBSD.ORG> Subject: Re: DPT driver fails and panics with Degraded Array Message-ID: <19980529122551.16212@follo.net> In-Reply-To: <509A2986E5C5D111B7DD0060082F32A402FAD1@freya.circle.net>; from tcobb on Fri, May 29, 1998 at 05:49:30AM -0400 References: <509A2986E5C5D111B7DD0060082F32A402FAD1@freya.circle.net>
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On Fri, May 29, 1998 at 05:49:30AM -0400, tcobb wrote: > > (1) I've had my array (a 2GB RAID1 - personal RAID :-) run in degraded > > mode. This has worked just fine with the driver in -current, with > > the RAID full (of partitions, not data. I can't understand that > > the amount of data should make a difference - the controller > > shouldn't know about this anyway). > > Perhaps the difference is RAID-1 versus RAID-5. This might be so, or there might (I'm probably blaspheming by saying this) be a difference or bug in the handling of degradation from DPT to DPT. What is obvious is only that you're having problems with a particular controller/driver/kernel combination, and that a part of the driver has problems coping with failure somewhere else. I don't think it would be wise to consider the problem to be narrowed down more than that. Now, to be able to debug this as effectively as possible I suggest you/we try to create a list of test-cases that we believe would lock down the problem: Hypothesis 1: The problem occur when using your type of controller, RAID5+HotSpare, "large" amounts of capacity used, your kernel, and a disk fail. Verification: Create above setup, try to fail a disk on it. Now, which parameters to vary depend on whether we can get the above to crash. It might be dependent on having exactly equal disks, too :-( Eivind. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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