Date: Thu, 08 Nov 2007 01:09:39 -0700 From: Scott Long <scottl@samsco.org> To: Borja Marcos <borjam@sarenet.es> Cc: freebsd-scsi@freebsd.org Subject: Re: MFI and passthrough Message-ID: <4732C443.1070100@samsco.org> In-Reply-To: <A5B54593-6C21-4A1C-9382-370E34D4364C@sarenet.es> References: <200711052127.lA5LRblV035714@ambrisko.com> <4730821B.3060403@samsco.org> <A5B54593-6C21-4A1C-9382-370E34D4364C@sarenet.es>
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Borja Marcos wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > > On Nov 6, 2007, at 4:02 PM, Scott Long wrote: > >> Doug Ambrisko wrote: >>> BTW, it works great in this mode if you know what you are doing :-) >> >> Can you explain what that means? I recommend against it because it's >> not a well-tested configuration either in FreeBSD or in Dell. It's not >> clear, at least to me, how basic things like i/o errors get handled; >> does SCSI sense data get consumed by the controller firmware, or is it >> passed through to the OS without problem? > > Aha, I see. I assumed that the controller would pass the sense data, > etc, without problems. > >>> | I do believe that Dell does sell a direct attached disk option for >>> | the 2950/1950 called the PERC5/e. It's essentially an LSI MPT-SAS >>> | controller that directly replaces the PERC5/i card that you have now. >>> | It should be able to control all 6 disk slots, and can do both SAS >>> | and SATA. >>> I've been told the PERC5/e and PERC5/i are the same except for PCI >>> sub-device ID and are both the mfi(4) RAID controllers. They do >>> have a mpt(4) based card but it only supports 4 bays. I'm not sure >>> what it's real name is but we have some lying around for random >>> testing. I don't leave them in machines. >> >> We should get a definitive answer on this. > > We asked our Dell salesman and he confirmed that there's a non disk > array card for this machine, > but it only supports 4 disks, not 6. > Ok, I thought that the 4 disk option just routed the motherboard SATA connectors to the backplane, and that there was a 6 disk SAS+SATA option that put an MPT card into the slot behind the backplane. Oh well. Scott
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