From mboxrd@z Thu Jan 1 00:00:00 1970 From: John Rowe Subject: Re: New features? Date: Tue, 31 Oct 2006 12:09:17 +0000 Message-ID: <1162296558.32109.124.camel@kenny> References: <1162293818.32109.113.camel@kenny> <17735.14472.835153.186432@cse.unsw.edu.au> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <17735.14472.835153.186432@cse.unsw.edu.au> Sender: linux-raid-owner@vger.kernel.org To: Neil Brown Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids Thanks for this Neil, good to know that most of what I would like is already available. I think your reply highlights what I almost put in there as my first priority: documentation, specifically a HOWTO. > I believe that 2.6.18 has SATA hot-swap, so this should be available > know ... providing you can find out what commands to use. Exactly! > > 2 Adding new disks to arrays. Allows incremental upgrades and to take > > advantage of the hard disk equivalent of Moore's law. > > Works for raid5 and linear. Raid6 one day. Am I misinterpreting the mdadm 2.5 man pages when it says: Grow (or shrink) an array, or otherwise reshape it in some way. Currently supported growth options including changing the active size of component devices in RAID level 1/4/5/6 and changing the number of active devices in RAID1. > > 3. RAID level conversion (1 to 5, 5 to 6, with single-disk to RAID 1 a > > lower priority). > > A single disk is large than a RAID1 built from it, so this is > non-trivial. What exactly do you want to do there. Single to disk is less important, but adding a third disk to a RAID1 pair to make a RAID5 would be nice as would be adding one or more disks to a RAID5 to make a RAID6. John