Date: Sat, 25 Sep 2010 17:25:50 -0600 From: Scott Long <scottl@samsco.org> To: =?iso-8859-1?Q?Dag-Erling_Sm=F8rgrav?= <des@des.no> Cc: freebsd-scsi@freebsd.org, Niklas Saers <niklas@saers.com> Subject: Re: mfi - setting up disks Message-ID: <EAB77787-6A80-43AC-B979-91262FB18D05@samsco.org> In-Reply-To: <86aan67obp.fsf@ds4.des.no> References: <2EA9CBBC-3F97-4AF2-BFB5-96DF39FDE376@saers.com> <86aan67obp.fsf@ds4.des.no>
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On Sep 24, 2010, at 4:45 PM, Dag-Erling Sm=F8rgrav wrote: > Niklas Saers <niklas@saers.com> writes: >> In the SuperMicro system where I had problems with the mpt = controller, >> I switched it for a mfi-based controller. I had it set up with 36x >> RAID0 volumes with each their own disk (no way to access the disk >> otherwise I found), and added them to a ZFS system. The numbering >> became a bit weird, so I pulled the disks out one by one and put them >> back to figure out and note down what disk number was in what >> slot. Only test data on my ZFS volume, so I didn't mind that = crashing. >=20 > You can wire down SCSI buses and disks in /boot/device.hints so each > disk always gets the same device number regardless of the order in = which > the disks spin up. The syntax is documented in /sys/conf/NOTES = (search > for "SCSI DEVICE CONFIGURATION"). It's a CAM feature, and mfi uses = CAM, MFI only uses CAM for passthrough access to component drives, not for = normal I/O. Setting CAM wiring hints will not solve the problem at = hand. And the problem at hand isn't really even numbering, it's that = the MFI firmware freaked out and marked the disks inaccessible. I think = that this happened to us at Yahoo once, and we eventually gave up and = replaced the disks. Putting the disks on a non-LSI, non-RAID controller = and writing 0's to the last 10MB worth of sectors (or just writing 0's = to the entire drive) will likely solve the problem, but YMMV. Scott
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