From owner-freebsd-fs Thu Nov 4 14:32: 2 1999 Delivered-To: freebsd-fs@freebsd.org Received: from kronos.alcnet.com (kronos.alcnet.com [63.69.28.22]) by hub.freebsd.org (Postfix) with ESMTP id 5E29D1568B for ; Thu, 4 Nov 1999 14:31:59 -0800 (PST) (envelope-from kbyanc@posi.net) X-Provider: ALC Communications, Inc. http://www.alcnet.com/ Received: from localhost (kbyanc@localhost) by kronos.alcnet.com (8.9.3/8.9.3/antispam) with ESMTP id RAA20925; Thu, 4 Nov 1999 17:31:17 -0500 (EST) Date: Thu, 4 Nov 1999 17:31:17 -0500 (EST) From: Kelly Yancey X-Sender: kbyanc@kronos.alcnet.com To: Greg Lehey Cc: freebsd-fs@FreeBSD.ORG Subject: Re: feature list journalled fs In-Reply-To: <19991104170819.58641@mojave.sitaranetworks.com> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-fs@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org > > Then only parity would need to be recalculated. It only doesn't work > > with RAID 5 because the data is supposed to be distributed uniformly > > across the disks, so restriping is required. > > Well, no, you've missed the point: with the exception of the first > stripe, *all* the data in the plex needs to be reshuffled, whether > you're doing RAID-4 or RAID-5. > > Greg Hmm. Yes, I suppose maintaining the location of data on the disk might be important :) [ looking for dunce cap ]. The new space would have to appear at the end of the volume, not scattered throughout it's internals :) Kelly -- Kelly Yancey - kbyanc@posi.net - Richmond, VA Director of Technical Services, ALC Communications http://www.alcnet.com/ Maintainer, BSD Driver Database http://www.posi.net/freebsd/drivers/ Coordinator, Team FreeBSD http://www.posi.net/freebsd/Team-FreeBSD/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-fs" in the body of the message