I would like to know what is the proper syntax for creating / growing
my RAID5 array with 3 disks and 0 spare to 4 disks and 0 spare? Right
now my RAID5 array on my system appears as follows:
/dev/md0:
Version : 0.90
Creation Time : Wed Jan 27 08:15:03 2010
Raid Level : raid5
Array Size : 480391552 (458.14 GiB 491.92 GB)
Used Dev Size : 240195776 (229.07 GiB 245.96 GB)
Raid Devices : 3
Total Devices : 3
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Wed Jan 27 13:47:49 2010
State : clean, degraded, recovering
Active Devices : 2
Working Devices : 3
Failed Devices : 0
Spare Devices : 1
Layout : left-symmetric
Chunk Size : 64K
Rebuild Status : 10% complete
UUID : e3c1e8b3:5a1b141f:af88d4a5:584f0b5f
Events : 0.347
Number Major Minor RaidDevice State
0 8 2 0 active sync /dev/sda2
1 8 18 1 active sync /dev/sdb2
3 8 34 2 spare rebuilding /dev/sdc2
I have an identical drive and want to make /dev/sdd2 a active member
of the RAID5 array which should expand my disk storage capacity.
I checked out the 'man' page for 'mdadm' utility and I think I am
wanting to use the 'mdadm --grow' command but I don't really know what
I am doing here and the man page is a nice reference but I am looking
for more guidance. Can anyone please tell me what is the proper way to
get my desired result?
*PS*
I understand right now my RAID5 is syncing and should probably wait
until all three drives are synced.
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