> -----Original Message----- > From: NeilBrown [mailto:neilb@xxxxxxx] > Sent: Thursday, May 12, 2011 8:23 PM > To: lrhorer@xxxxxxxxxxx > Cc: linux-raid@xxxxxxxxxxxxxxx > Subject: Re: Growing a RAID array > > On Thu, 12 May 2011 20:02:01 -0500 "Leslie Rhorer" <lrhorer@xxxxxxxxxxx> > wrote: > > > > > I am shortly going to be growing a 10 drive RAID6 array with two > > additional drives. Can this be done in a single grow operation by > setting > > n=12, or do I have to grow it 1 drive at a time? > > > > Experiment with loop-back devices created on modest sized files. OK, I tried this, but for some reason the re-shape is failing, even with 1 "disk". I've grown arrays under mdadm any number of times, and I'm not sure why this is failing. I created 8 loop devices of 10M each. I then created a RAID6 array with 6 members and 2 spares. When I try to add one or both drives, I get an error: RAID-Server:/RAID# mdadm -G /dev/md6 -n 8 --backup-file=/RAID/raid6.bak mdadm: Need to backup 12288K of critical section.. mdadm: /dev/md6: Something wrong - reshape aborted Here is the reported layout: RAID-Server:/RAID# mdadm -D /dev/md6 /dev/md6: Version : 1.2 Creation Time : Fri May 13 23:15:39 2011 Raid Level : raid6 Array Size : 36864 (36.01 MiB 37.75 MB) Used Dev Size : 9216 (9.00 MiB 9.44 MB) Raid Devices : 6 Total Devices : 8 Persistence : Superblock is persistent Intent Bitmap : Internal Update Time : Fri May 13 23:23:04 2011 State : active Active Devices : 6 Working Devices : 8 Failed Devices : 0 Spare Devices : 2 Layout : left-symmetric Chunk Size : 1024K Name : RAID-Server:6 (local to host RAID-Server) UUID : 332f387c:6c301089:22904f6c:8089b9b4 Events : 30 Number Major Minor RaidDevice State 0 7 0 0 active sync /dev/loop0 1 7 1 1 active sync /dev/loop1 2 7 2 2 active sync /dev/loop2 3 7 3 3 active sync /dev/loop3 4 7 4 4 active sync /dev/loop4 5 7 5 5 active sync /dev/loop5 6 7 6 - spare /dev/loop6 7 7 7 - spare /dev/loop7 The mdadm version is 3.1.4 under kernel 2.6.32-5-amd64 -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
