Date: Fri, 14 Jan 2005 11:27:19 -0700 From: Scott Long <scottl@freebsd.org> To: Tony Byrne <freebsd@byrnehq.com> Cc: freebsd-stable@freebsd.org Subject: Re: MegaRAID 'Bad Slot' Kernel message and crash. Message-ID: <41E80F07.6000000@freebsd.org> In-Reply-To: <279983263.20050114092121@byrnehq.com> References: <1433078378.20050111134014@byrnehq.com> <20050113172415.E13904@carver.gumbysoft.com> <279983263.20050114092121@byrnehq.com>
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Tony Byrne wrote: > Hello Doug, > > Friday, January 14, 2005, 1:35:16 AM, you wrote: > > DW> scottl has been able to reproduce this on a U320 controller he has. I only > DW> have U160 equipment and can't get the txn rate up high enough to reproduce > DW> the issue. The driver needs KTR instrumentation so we can see where the > DW> bad slot is popping up from. The "bad slot" message appears when the > DW> controller returns completion for a command that had already completed. > > DW> The amr driver has several other issues and is in dire need of an > DW> overhaul. Unfortunately LSI has not been forthcoming with documentation, > DW> so Scott and I are pretty much scratching our heads without knowing where > DW> to go. > > DW> This is in 5.X and HEAD, at least. I can't comment on 4.x. > > We have switched off adaptive read caching on the card. One of my > other correspondents has said that he hasn't been experiencing this > problem. He sent me his configuration settings. Only time will tell > if this helps. > > What is state-of-the-art, regarding SCSI RAID support in FreeBSD? > Which cards / drivers are favoured for their stability? We are > building a second server, initially without RAID, but given our > problems with amr we are considering another RAID controller supported by a > different driver. We want to do write caching and need a card that > supports a battery backed cache. How about the Adaptec cards? > > Regards, > > Tony. > This question has been discussed at length on the freebsd-scsi mailing list under the topic 'Recommended RAID controller'. I can send you some recap emails if you need. Scott
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