Date: Fri, 12 Dec 97 17:09:08 -0500 From: Mark Salyzyn <salyzyn_mark@dpt.com> To: freebsd-scsi@FreeBSD.ORG Subject: Re: RAID on FreeBSD Message-ID: <9712122209.AA20739@bohica.bohica.dpt.com>
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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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