From owner-freebsd-hackers Sun Apr 2 07:16:41 1995 Return-Path: hackers-owner Received: (from majordom@localhost) by freefall.cdrom.com (8.6.10/8.6.6) id HAA16819 for hackers-outgoing; Sun, 2 Apr 1995 07:16:41 -0700 Received: from linux4nn.iaf.nl (root@linux4nn.iaf.nl [193.67.144.34]) by freefall.cdrom.com (8.6.10/8.6.6) with ESMTP id HAA16797 for ; Sun, 2 Apr 1995 07:16:37 -0700 Received: from uni4nn.iaf.nl (root@uni4nn.iaf.nl [193.67.144.33]) by linux4nn.iaf.nl (8.6.9/8.6.9) with SMTP id QAA09853; Sun, 2 Apr 1995 16:23:44 +0200 Received: by uni4nn.iaf.nl with UUCP id AA25892 (5.67b/IDA-1.5); Sun, 2 Apr 1995 17:16:57 +0200 Received: by iafnl.iaf.nl with UUCP id AA11060 (5.65c/IDA-1.4.4); Sun, 2 Apr 1995 14:04:53 +0200 Received: (from wilko@localhost) by yedi.iaf.nl (8.6.8/8.6.6) id UAA01396; Sat, 1 Apr 1995 20:15:16 +0200 From: Wilko Bulte Message-Id: <199504011815.UAA01396@yedi.iaf.nl> Subject: Re: large filesystems/multiple disks [RAID] To: PVinci@ix.netcom.com (Paul Vinciguerra) Date: Sat, 1 Apr 1995 20:15:16 +1596657 (MET DST) Cc: hackers@FreeBSD.org In-Reply-To: <199504011440.GAA17939@ix3.ix.netcom.com> from "Paul Vinciguerra" at Apr 1, 95 06:40:04 am X-Mailer: ELM [version 2.4 PL22] Content-Type: text Content-Length: 1087 Sender: hackers-owner@FreeBSD.org Precedence: bulk > > 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 --------------------------------------------------------------------------------