Date: Mon, 3 Apr 1995 21:05:08 +1596657 (MET DST) From: Wilko Bulte <wilko@yedi.iaf.nl> To: rgrimes@gndrsh.aac.dev.com (Rodney W. Grimes) Cc: peter@bonkers.taronga.com, terry@cs.weber.edu, PVinci@ix.netcom.com, hackers@FreeBSD.org Subject: Re: large filesystems/multiple disks [RAID] Message-ID: <199504031905.VAA01885@yedi.iaf.nl> In-Reply-To: <199504021655.JAA01937@gndrsh.aac.dev.com> from "Rodney W. Grimes" at Apr 2, 95 09:55:58 am
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> RAID does have the negative effect of of having to write 20% more data, > thus cutting effective bandwidth by 20%. It is actually worse than > this in that all writes must write to at least 2 drives no matter how > small they are. The removes some of the benifits of stripping. And that is why some RAID systems use (battery backed up please ;-) RAM caches. This works quite nicely. > Rod Grimes rgrimes@gndrsh.aac.dev.com > Accurate Automation Company Custom computers for FreeBSD Wilko _ __________________________________________________________________________ | / o / / _ Wilko Bulte email: wilko@yedi.iaf.nl |/|/ / / /( (_) Private FreeBSD site - Arnhem - The Netherlands --------------------------------------------------------------------------------
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