Date: Thu, 24 Jan 2013 17:09:56 +0100 From: Borja Marcos <borjam@sarenet.es> To: Steven Hartland <killing@multiplay.co.uk> Cc: FreeBSD Filesystems <freebsd-fs@freebsd.org>, freebsd-scsi@freebsd.org Subject: Re: Problem adding SCSI quirks for a SSD, 4K sector and ZFS Message-ID: <FF2FCD9E-0CA5-4030-8881-C866FA97CF1D@sarenet.es> In-Reply-To: <A71C9D2FA3984F6A84CED6DE3E21DDCF@multiplay.co.uk> References: <492280E6-E3EE-4540-92CE-C535C8943CCF@sarenet.es> <A71C9D2FA3984F6A84CED6DE3E21DDCF@multiplay.co.uk>
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On Jan 24, 2013, at 12:19 PM, Steven Hartland wrote: >=20 > ----- Original Message ----- From: "Borja Marcos" <borjam@sarenet.es> > To: <freebsd-scsi@freebsd.org> > Cc: "FreeBSD Filesystems" <freebsd-fs@freebsd.org> > Sent: Thursday, January 24, 2013 9:46 AM > Subject: Problem adding SCSI quirks for a SSD, 4K sector and ZFS >=20 >=20 >>=20 >> Hello, >>=20 >> Crossposting to FreeBSD-fs, as I am wondering if I have had a problem = with ZFS and sector size detection as well. >>=20 >> I am doing tests with an OCZ Vertex 4 connected to a SAS backplane. >>=20 >> < OCZ-VERTEX4 1.5> at scbus6 target 22 lun 0 = (pass19,da15) >>=20 >> (The blank before "OCZ" really appears there) >>=20 >> pass19: < OCZ-VERTEX4 1.5> Fixed Direct Access SCSI-5 device >> pass19: Serial Number OCZ-1SVG6KZ2YRMSS8E1 >> pass19: 3.300MB/s transfers >>=20 >> I am bypassing an "aac" RAID card so that the disks are directly = attached to the da driver, instead of relying on the so-called JBOD = feature. >>=20 >> I have had a weird problem, with the disk being unresponsive to the = REQUEST CAPACITY(16) command. Weird, seems it timeouts. >>=20 >> So, just to complete the tests, I have added a quirk to scsi_da.c. = Anyway, I also need the disk to be recognized as a 4K sector drive. >>=20 (...) > Simple answer is ZFS doesn't understand quirks. The attached patch = does > what you're looking for along with a few other things, see notes at > the top for details. >=20 > Its not a final version as there's still some discussion about > implementation details but it should do what your looking for. Oh, sorrry for the confusion! I assumed that the da driver would = announce a 4 KB sector instead of the 512 bytes due to the quirks.=20 Which brings an interesting question, I might have a potential time = bomb in my experimental machine at home. It's a ZFS mirror with two 500 = MB disks. One of the has 512 byte sectors, the other is "advanced = format".=20 Borja.
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