Date: Thu, 11 Dec 1997 15:56:02 -0800 From: Harry Aulakh <harry@tesys.com> To: Tom <tom@sdf.com>, Wilko Bulte <wilko@yedi.iaf.nl> Cc: walcaraz@indy3.gstone.com, freebsd-scsi@FreeBSD.ORG Subject: Re: RAID on FreeBSD Message-ID: <3.0.32.19971211155601.0092e580@gw1.tesys.com>
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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.. > > 10 drives is a much nicer number. > >> > with 10 drives instead, and make two 5 drive arrays. >> > Harry Aulakh Sr. Engineer Telenet System Solution Inc. 2480 kruse drive San Jose Ca-95131 Phone 408-383-0334 ext 111 fax 408-383-0335 Web www.tesys.com
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