Date: Thu, 16 Nov 2017 10:43:53 -0800 From: Lee Brown <leeb@ratnaling.org> Cc: freebsd-scsi@freebsd.org, freebsd-hardware@freebsd.org Subject: Re: Does anybody have experience with a MD1420, mpr(4) Message-ID: <CAFPNf59WG4fosJzeHXKPAUuUNVfyxV6OwYRHax7iELQEjGVcRw@mail.gmail.com> In-Reply-To: <20171116142843.GA25563@mithlond.kdm.org> References: <CAFPNf59BAN3EWsvho47E9jAx8P0Y56dHgAPrBwj5HRZN3KvRPw@mail.gmail.com> <20171116142843.GA25563@mithlond.kdm.org>
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On Thu, Nov 16, 2017 at 6:28 AM, Kenneth D. Merry <ken@freebsd.org> wrote: > On Wed, Nov 15, 2017 at 12:24:47 -0800, Lee Brown wrote: > > Hi, > > > > This is my for foray into DAS, so please be gentle :) Apologies if the > > cross-post is inappropriate, let me know. > > > > I'm looking to build a SAS array with a Dell MD1420. It will be attached > > via a SAS 9300-414E HBA in a Dell R330. > > > > I've verified that the server / SAS card should be fine, but just wanted > to > > know if anybody has set this up before, or if there's any obvious reason > > why it wouldn't work. Dell can be a bit weird sometimes. > > > > Any information is most welcome. > > In theory it should be fine. I haven't used a Dell enclosure recently, but > from posts here, it seems that they like to turn on Type 2 Protection > Information on the drives. (Assuming you buy the drives from Dell.) > > If they do that, you can either reformat, or see the patch here for the > mpr(4) driver to disable using protection information: > > https://docs.freebsd.org/cgi/getmsg.cgi?fetch=308820+0+ > archive/2017/freebsd-scsi/20171022.freebsd-scsi > > I haven't gotten around to changing things so that we detect the PI in the > da(4) driver and use 32 byte CDBs when type 2 protection is enabled. (So > if someone else has time and wants to do it, feel free. It will be > somewhat messy because we only allocate enough space for 16 byte CDBs > inside > the CCB, so you'll need to allocate the CDB separately...) > > If you use ZFS, you'll have checksum protection on your data anyway, so PI > would just be additional protection. > > I would also suggest that you update to the latest firmware (currently > Phase 15) for the SAS controller. You can do that with LSI's sas3flash or > the FreeBSD mprutil(8) utility. > > Ken > -- > Kenneth Merry > ken@FreeBSD.ORG > Thanks Ken, I'm going to purchase the system. I had no idea about PI, that's a nice feature for sure. This will probably just be iSCSI and NFS4 over a 10Gb NIC (Xen cluster), so having PI detection is certainly of interest to me. I'll figure out what I can do to contribute (code/testing) when things have settled. Assuming all is well I'll get the 1420 added to the hardware compatibility list. Much appreciated -- lee
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