Date: Tue, 20 Jan 1998 18:57:06 -0800 (PST) From: Jaye Mathisen <mrcpu@cdsnet.net> To: salyzyn@dpt.com Cc: freebsd-scsi@FreeBSD.ORG Subject: Re: RAID on FreeBSD Message-ID: <Pine.NEB.3.95.980120185607.23979E-100000@mail.cdsnet.net> In-Reply-To: <9712122209.AA20739@bohica.bohica.dpt.com>
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While I realize this is an old message, it's answers like this that make me glad I keep on buying DPT. I appreciate DPT's efforts in making their board work with just about everything. On Fri, 12 Dec 1997, Mark Salyzyn wrote: > In article <3.0.32.19971211155601.0092e580@gw1.tesys.com>, you wrote: > >At 03:04 PM 12/11/97 -0800, Tom wrote: > >>On Thu, 11 Dec 1997, Wilko Bulte wrote: > >>> > 9 drives in an uncomfortable number for RAID5. Probably better to go > >>> Why would 9 drives be uncomfartable? > >> Well, if you are going to making one arrray of 9 drives, write > >>performance will bad. If you are going to making 3 arrays of 3 > >>drives each, you will end up with a lot of overhead. > >> RAID5 arrays of 5 drives is kinda of nice sweet spot. If you go much > >>bigger, just use RAID0 over multiple RAID5. > >Please note that dual RAID support (dpt based) is not available under > >FreeBSD(there are few other OS's which do support it), as per my > >information.. Can someone verify that.. > > Software RAID is not available for the current driver by Simon. > > However, we have supplied Simon sources to a RAID-0 subsystem that he > may add to the driver in the future. > > There is nothing preventing an OS RAID-0 from being set up, the > only disadvantages are that it is not integrated into the DPT management > solutions and you can not boot off of a dual level RAID device utilizing > the second level within an OS driver. > > Sincerely -- Mark Salyzyn >
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