Date: Wed, 21 Jan 1998 09:28:39 -0800 (PST) From: Simon Shapiro <shimon@simon-shapiro.org> To: Jaye Mathisen <mrcpu@cdsnet.net> Cc: freebsd-scsi@FreeBSD.ORG, salyzyn@dpt.com Subject: Re: RAID on FreeBSD Message-ID: <XFMail.980121092839.shimon@simon-shapiro.org> In-Reply-To: <Pine.NEB.3.95.980120185607.23979E-100000@mail.cdsnet.net>
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On 21-Jan-98 Jaye Mathisen wrote: > > 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. Hi Mark! This is true. Time, simply no time. >> However, we have supplied Simon sources to a RAID-0 subsystem that he >> may add to the driver in the future. Once we get the multi-initiator code to work, we will look at the in-kernel RAID-0. >> 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. While I totally agree that an integrated solution is better, the ccd driver in FreeBSD does a fine job for most. The only thing it does not do is allow you to boot from a RAID-0 conposed of several RAID-{1,5}. And yes, Unlike some other HBA manufacturers, DPT actually helps and encourages use of its products in a non-M$ non-NDA environment. ---------- Sincerely Yours, Simon Shapiro Shimon@Simon-Shapiro.ORG Voice: 503.799.2313
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