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Hi all,
I have recently included one more drive in my system and has switched from raid0 to raid10 on 3 devices/partitions.
I have created the raid as follows:
mdadm --create /dev/md3 --verbose --raid-devices=3 --level=raid10 --name=cryptdata --layout=o2 --chunk=2M /dev/sda3
/dev/sdb3 /dev/sdf3
mdadm: size set to 319434752K
mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md3 started.
Information about the array:
mdadm --detail /dev/md3
/dev/md3:
Version : 1.2
Creation Time : Thu May 3 11:42:57 2012
Raid Level : raid10
Array Size : 479152128 (456.96 GiB 490.65 GB)
Used Dev Size : 319434752 (304.64 GiB 327.10 GB)
Raid Devices : 3
Total Devices : 3
Persistence : Superblock is persistent
Update Time : Thu May 3 11:42:57 2012
State : clean, resyncing (PENDING)
Active Devices : 3
Working Devices : 3
Failed Devices : 0
Spare Devices : 0
Layout : offset=2
Chunk Size : 2048K
Name : hanna64:cryptdata (local to host hanna64)
UUID : a7cc8eb7:8555b1bd:2856b686:829861be
Events : 0
Number Major Minor RaidDevice State
0 8 3 0 active sync /dev/sda3
1 8 19 1 active sync /dev/sdb3
2 8 83 2 active sync /dev/sdf3
And under /proc/mdstat:
cat /proc/mdstat
Personalities : [raid0] [raid1] [raid10]
md3 : active (auto-read-only) raid10 sdf3[2] sdb3[1] sda3[0]
479152128 blocks super 1.2 2048K chunks 2 offset-copies [3/3] [UUU]
resync=PENDING
The resync was not started due to the array being in auto-read-only mode.
I googled the issue and found out that to be able to start the resync one should issue:
mdadm --readwrite /dev/mdx
(ref.: http://wiki.xtronics.com/index.php/Raid )
I have done it and it started resyncing:
cat /proc/mdstat
Personalities : [raid0] [raid1] [raid10]
md3 : active raid10 sdf3[2] sdb3[1] sda3[0]
479152128 blocks super 1.2 2048K chunks 2 offset-copies [3/3] [UUU]
[=>...................] resync = 6.2% (29748096/479152128) finish=120.3min speed=62220K/sec
Is this intended feature for 1.2 metadata?
Kernel: 3.1.0-1-amd64
mdadm: 3.2.3-2
Distro: Debian testing
Cheers,
- -Nik
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