Have issue with mdadm similar to Simple mdadm RAID 1 not activating spare:
- have replaced faulty HDD in RAID 10
- fdisked and added new hdd to mdadmn
- mdam resynced array
After that I see following:
...
/dev/md2:
Version : 0.90
Raid Level : raid1
Array Size : 683792000 (652.11 GiB 700.20 GB)
Used Dev Size : 683792000 (652.11 GiB 700.20 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 2
Persistence : Superblock is persistent
State : clean, degraded
Active Devices : 1
Working Devices : 2
Failed Devices : 0
Spare Devices : 1
UUID : e8ba8727:1b7ba76c:2f2051f8:e6dff55c
Events : 0.94996850
Number Major Minor RaidDevice State
0 8 34 0 active sync /dev/sdc2
2 8 50 1 spare rebuilding /dev/sdd2
cat /sys/block/md2/md/sync_action
idle
Is it possible to convert spare drive to active without stopping an array?
UPDATE 1
Posting rebuild logs. Nothing interesting here...
grep md /var/log/messages
Jul 19 10:30:19 xen kernel: md: unbind Jul 19 10:30:19 xen kernel: md: export_rdev(sdd2) Jul 19 10:32:07 xen kernel: md: bind Jul 19 10:33:31 xen kernel: md: unbind Jul 19 10:33:31 xen kernel: md: export_rdev(sdd2) Jul 19 10:35:01 xen kernel: md: bind Jul 19 10:35:01 xen kernel: md: recovery of RAID array md2 Jul 19 10:35:01 xen kernel: md: minimum guaranteed speed: 1000 KB/sec/disk. Jul 19 10:35:01 xen kernel: md: using maximum available idle IO bandwidth (but not more than 200000 KB/sec) for recovery. Jul 19 10:35:01 xen kernel: md: using 128k window, over a total of 683792000 blocks. ... Jul 19 17:22:36 xen kernel: md: md2: recovery done.
Tried:
- removed ALL drives from array except working first drive( mdadm --grow /dev/md2 --raid-devices=1 --force)
- removed "removed" and "detached" drives
- zeroed superblock on new drive's partition (mdadm --zero-superblock /dev/sdd2)
- growed array to raid-devices=2
- re-added new drive mdadm /dev/md2 --add /dev/sdd2
everything is the same :(
mdadm --detail /dev/md2
/dev/md2:
Version : 0.90
Raid Level : raid1
Array Size : 683792000 (652.11 GiB 700.20 GB)
Used Dev Size : 683792000 (652.11 GiB 700.20 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 2
Persistence : Superblock is persistent
Update Time : Thu Jul 19 18:13:46 2018
State : clean, degraded
Active Devices : 1 Working Devices : 2 Failed Devices : 0 Spare Devices : 1
Events : 0.95212006
Number Major Minor RaidDevice State
0 8 34 0 active sync /dev/sdc2
2 8 50 1 spare rebuilding /dev/sdd2
