Date: Wed, 18 Feb 98 05:50:06 -0500 From: Mark Gregory Salyzyn <mark@bohica.net> To: freebsd-scsi@FreeBSD.ORG Subject: Re: getting oriented with RAID Message-ID: <9802181050.AA00457@deathstar.deathstar.dpt.com>
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In article <9802172145.AA00337@mail.kcwc.com>, you wrote: >> 1) From the DPT website, their PM2044UR (single channel >> PCI) RAID controller supports RAID 0, 1, 5, 0+1, and 0+5. >> Does this necessarily mean that the FreeBSD driver written >> by Simon can also do all of the above? Something I read >> in the archives indicated that you need do use ccd for >> RAID0. RAID support on the PM2044 requires the Caching card to be added ... >You can do all of those (at least on the PM3334), but as >you read, you must use the FreeBSD ccd driver to do the RAID 0 >(striping) parts. DPT supports RAID 0 across multiple >controllers, which means it must be supported in the driver >and not on/in the controller. As far as I can tell, Simon >just didn't get around to adding that to the driver. I see >no real reason to do so since it's supported by ccd with no >problem. ccd is very easy to use and you would have to use >it if you wanted to stripe across DPT and non-DPT controllers >anyway. One reason for adding support is the ability to boot off an array striped across adapters. >If you define a RAID 0 array with the DPT manager, it just >shows up as separate drives when you boot instead of as one >large drive (like it does with a RAID 1 or RAID 5 array). You need to create the array using `other UNIX' selected under storage manager. Another way, with the DOS storage manager, is to run `dptmgr /fw0'. Otherwise the storage manager creates software striped arrays ... Sincerely -- Mark Salyzyn To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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