Hello,
my /dev/md2 uses superblock 1.0, which is stored at the end of
device. Therefore I suppose that this approach of growing it isn't
going to work:
#Alter the partition tables, to make /dev/sd[abc]2 have new size:
fdisk /dev/sda
fdisk /dev/sdb
fdisk /dev/sdc
#reboot (make kernel read new partition table)
#then, grow the raid1 /dev/md1
mdadm --grow /dev/md2 --size=max
#and finaly, grow the ext2 (or ext3) fs on /dev/md1
resize2fs /dev/md1
Because in this way, after rebooting, /dev/md2 won't be found - the
superblock won't be in the correct place.
So, I would need to remove each of them from the array, resize
partition, then add it back. Thus needing three reboots, since I can
remove only one device at a time (the same HDDs have also partitions
belonging to root raid1 array), which must be always up & running.
I can afford reboots, no problem here, but isn't there some simpler way?
below is my raid layout, I need to grow md2 by few spare gigabytes
left at the end of /dev/sd[abc].
kernel 2.6.29 (impossible to upgrade at the moment).
Personalities : [raid0] [raid1] [raid10]
md2 : active raid10 sda2[0] sdc2[2] sdb2[1]
185381376 blocks super 1.0 512K chunks 2 far-copies [3/3] [UUU]
bitmap: 1/6 pages [4KB], 16384KB chunk
md1 : active raid1 sdc1[2](W) sdb1[3](W)
9767416 blocks super 1.0 [2/2] [UU]
bitmap: 1/150 pages [4KB], 32KB chunk
md0 : active raid1 sde1[0] sdd1[2] sda1[1]
9767424 blocks [3/3] [UUU]
bitmap: 1/150 pages [4KB], 32KB chunk
unused devices: <none>
atak:/home/janek# mdadm -D /dev/md2
/dev/md2:
Version : 1.0
Creation Time : Thu Sep 2 11:47:39 2010
Raid Level : raid10
Array Size : 185381376 (176.79 GiB 189.83 GB)
Used Dev Size : 123587584 (117.86 GiB 126.55 GB)
Raid Devices : 3
Total Devices : 3
Persistence : Superblock is persistent
Intent Bitmap : Internal
Update Time : Thu Dec 2 16:41:02 2010
State : active
Active Devices : 3
Working Devices : 3
Failed Devices : 0
Spare Devices : 0
Layout : far=2
Chunk Size : 512K
Name : atak:2 (local to host atak)
UUID : f2a75dbe:5ac91a1f:c09da3c0:f6f69c9c
Events : 28
Number Major Minor RaidDevice State
0 8 2 0 active sync /dev/sda2
1 8 18 1 active sync /dev/sdb2
2 8 34 2 active sync /dev/sdc2
best regards
--
Janek Kozicki http://janek.kozicki.pl/ |
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