From: NeilBrown <neilb@suse.de>
To: Edward Siefker <hatta00@fastmail.fm>
Cc: linux-raid@vger.kernel.org
Subject: Re: Raid 5 to 6 grow stalled
Date: Sun, 10 Apr 2011 07:30:39 +1000 [thread overview]
Message-ID: <20110410073039.2d9683ac@notabene.brown> (raw)
In-Reply-To: <1302366232.12096.1439264077@webmail.messagingengine.com>
On Sat, 09 Apr 2011 09:23:52 -0700 "Edward Siefker" <hatta00@fastmail.fm>
wrote:
> I have a 3 disk raid-5 array I want to convert to a 4 disk raid-6 array.
> I added the 4th disk as a spare, and thought that it would get used
> automatically when I converted it to 6, but instead it created a
> degraded
> raid 6 array. So I removed the spare and added it back to the array to
> get it to rebuild. It did start rebuilding, but stalled out.
>
> Here's some console output showing what I did:
>
> root@iblis:/home/hatta# mdadm --grow /dev/md2 --level 6 --raid-devices 4
> --backup-file=/mnt/sda6/yo
> mdadm level of /dev/md2 changed to raid6
> root@iblis:/home/hatta# cat /proc/mdstat
> Personalities : [raid10] [raid6] [raid5] [raid4]
> md2 : active (auto-read-only) raid6 sdd1[0] sde1[3](S) sdf1[2] sdc1[1]
> 2930271872 blocks level 6, 64k chunk, algorithm 18 [4/3] [UUU_]
>
> root@iblis:/home/hatta# mdadm /dev/md2 --remove /dev/sde1
> mdadm: hot removed /dev/sde1 from /dev/md2
> root@iblis:/home/hatta# mdadm /dev/md2 --add /dev/sde1
> mdadm: re-added /dev/sde1
> root@iblis:/home/hatta# cat /proc/mdstat
> Personalities : [raid10] [raid6] [raid5] [raid4]
> md2 : active raid6 sde1[4] sdd1[0] sdf1[2] sdc1[1]
> 2930271872 blocks level 6, 64k chunk, algorithm 18 [4/3] [UUU_]
> [>....................] recovery = 0.0% (8192/1465135936)
> finish=11899.9min speed=2048K/sec
> ...
> ...
> ...
> md2 : active raid6 sde1[4] sdd1[0] sdf1[2] sdc1[1]
> 2930271872 blocks level 6, 64k chunk, algorithm 18 [4/3] [UUU_]
> [>....................] recovery = 0.0% (8192/1465135936)
> finish=2954174.4min speed=8K/sec
>
>
> What's going on here?
Doesn't look good..
What version of mdadm? What kernel?
NeilBrown
next prev parent reply other threads:[~2011-04-09 21:30 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-09 16:23 Raid 5 to 6 grow stalled Edward Siefker
2011-04-09 16:55 ` Edward Siefker
2011-04-09 21:30 ` NeilBrown [this message]
2011-04-10 15:02 ` Edward Siefker
2011-04-10 15:09 ` Mathias Burén
2011-04-10 21:52 ` NeilBrown
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