Date: Sat, 1 Apr 1995 20:15:16 +1596657 (MET DST) From: Wilko Bulte <wilko@yedi.iaf.nl> To: PVinci@ix.netcom.com (Paul Vinciguerra) Cc: hackers@FreeBSD.org Subject: Re: large filesystems/multiple disks [RAID] Message-ID: <199504011815.UAA01396@yedi.iaf.nl> In-Reply-To: <199504011440.GAA17939@ix3.ix.netcom.com> from "Paul Vinciguerra" at Apr 1, 95 06:40:04 am
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> > Are there any plans/work in progress for allowing FreeBSD the ability > to have > >> filesystems span multiple physicle volumes (ala Logical Volume > Manager on > >> AIX/OSF) ? > >It should also be noted that this type of arrangement is extremely > >fragile -- it's order n^2 for n disks more fragile than file systems > >not spanning disks at all. You shouldn't attempt this type of > > Why? Isn't this what the world is moving toward, ala RAID? It's my > understanding that RAID spanning/striping adds about 20% to the file > system, but IMPROVES reliability/stability. Stop! Spanning and RAID are not the same. And only RAID5 and friends give you redundancy against single-disk failures. RAID0 (striping) leaves you hair tearing when one of the member disks breaks. Wilko _ __________________________________________________________________________ | / o / / _ Wilko Bulte email: wilko@yedi.iaf.nl |/|/ / / /( (_) Private FreeBSD site - Arnhem - The Netherlands --------------------------------------------------------------------------------
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