Hi mailing list,
First, thanks for this great software!
I have a RAID5 setup with on 6x 2TB HDD:
/dev/md0:
Version : 1.2
Creation Time : Tue Oct 19 08:58:41 2010
Raid Level : raid5
Array Size : 9751756800 (9300.00 GiB 9985.80 GB)
Used Dev Size : 1950351360 (1860.00 GiB 1997.16 GB)
Raid Devices : 6
Total Devices : 6
Persistence : Superblock is persistent
Intent Bitmap : Internal
Update Time : Tue Apr 12 17:50:25 2011
State : active
Active Devices : 6
Working Devices : 6
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 64K
Name : ion:0 (local to host ion)
UUID : e6595c64:b3ae90b3:f01133ac:3f402d20
Events : 3035979
Number Major Minor RaidDevice State
0 8 81 0 active sync /dev/sdf1
1 8 17 1 active sync /dev/sdb1
4 8 49 2 active sync /dev/sdd1
3 8 33 3 active sync /dev/sdc1
5 8 65 4 active sync /dev/sde1
6 8 97 5 active sync /dev/sdg1
$ cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md0 : active raid5 sdf1[0] sdg1[6] sde1[5] sdc1[3] sdd1[4] sdb1[1]
9751756800 blocks super 1.2 level 5, 64k chunk, algorithm 2 [6/6] [UUUUUU]
bitmap: 1/15 pages [4KB], 65536KB chunk
unused devices: <none>
I'm approaching over 6.5TB of data, and with an array this large I'd
like to migrate to RAID6 for a bit more safety. I'm just checking if I
understand this correctly, this is how to do it:
* Add a HDD to the array as a hot spare:
mdadm --manage /dev/md0 --add /dev/sdh1
* Migrate the array to RAID6:
mdadm --grow /dev/md0 --raid-devices 7 --level 6
Cheers,
// Mathias
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