Date: Tue, 22 Jan 2019 13:10:34 +0100 From: Borja Marcos <borjam@sarenet.es> To: Borja Marcos <borjam@sarenet.es> Cc: Steven Hartland <killing@multiplay.co.uk>, freebsd-fs <freebsd-fs@freebsd.org> Subject: Re: ZFS on Hardware RAID Message-ID: <E4422BA2-A9E3-4CC6-8E10-EA6B8563A2BE@sarenet.es> In-Reply-To: <A593D329-3526-4B5A-BCEF-7C17FA5FFA49@sarenet.es> References: <1180280695.63420.1547910313494.JavaMail.zimbra@gausus.net> <92646202.63422.1547910433715.JavaMail.zimbra@gausus.net> <CAOeNLurgn-ep1e=Lq9kgxXK%2By5xqq4ULnudKZAbye59Ys7q96Q@mail.gmail.com> <alpine.BSF.2.21.1901200834470.12592@mail0.time-domain.co.uk> <1691666278.63816.1547976245836.JavaMail.zimbra@gausus.net> <alpine.BSF.2.21.1901200930550.12592@mail0.time-domain.co.uk> <CAMdBLfQvF7mXriwAvu-h5BaXBNhb_8VPRRfDmeM0u1NGoyWY_g@mail.gmail.com> <92746659-4B3F-415C-BB6A-6C99837AFAF2@sarenet.es> <335e44ec-7c76-8dbd-f587-46e6a9266efc@multiplay.co.uk> <A593D329-3526-4B5A-BCEF-7C17FA5FFA49@sarenet.es>
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> On 22 Jan 2019, at 12:52, Borja Marcos <borjam@sarenet.es> wrote: > > HBA mode: when the card is in IT mode *or* it does expose the actual targets to the CAM layer. In the past I did it > by manually patching the drivers and I’ve kept systems running smoothly for many years despite using IR cards. > Currently you can use hw.mfi.allow_cam_disk_passthrough tunable to achieve the same effect without ugly tinkering. This is what I did long ago to have IR cards expose the targets to the CAM layer. It was a suggestion from Scott Long. I first did it with AAC cards, later with MFI ones. https://lists.freebsd.org/pipermail/freebsd-scsi/2007-October/003223.html Some years ago the “recipe” was made official (although not encouraged) by adding the hw.mfi.allow_cam_disk_passthrough tunable. Doing this I didn’t need to create volumes or anything. Just plug the disks and avoid to configure anything for them on the RAID controller. The disks appeared as “da” devices and I could hot plug them and use the CAM commands without any issues. Borja.help
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