Hi,
I have a problem. I'm worried I may have borked my array :/
I've been running a 3x2TB RAID-5 array and I recently got another 2TB
drive, intending to bump it up to a 4x2TB RAID-6 array.
I stuck the new disk in and added it to the RAID array, as follows
("/files" is on a non-RAID disk):
mdadm --manage /dev/md0 --add /dev/sda
mdadm --grow /dev/md0 --raid-devices 4 --level 6
--backup-file=/files/mdadm-backup
It seemed to work and the grow process started okay, reporting about 3
days to completion (at ~8MB/s) which seemed really slow, but I left it
anyway. Next morning, time to complete was several years and the
kernel had spat out a bunch of I/O errors (lost those logs, sorry).
I figured the new disk must be at fault, because I'd done an array
check recently and the others seemed okay. Hoping it might abort the
grow, I failed the new disk:
mdadm --manage /dev/md0 --fail /dev/sda
But mdadm kept reporting years to completion. So I rebooted.
Now I'd like to know - what state is my array in? If possible I'd like
to get back to a working 3 disk RAID-5 configuration while I test the
new disk and figure out what to do with it.
The backup-file doesn't exist, and the stats on the array are as follows:
--------------------------
cat /proc/mdstat:
--------------------------
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5]
[raid4] [raid10]
md0 : inactive sdd[1] sde[3] sdc[0] sda[4]
7814054240 blocks super 1.2
unused devices: <none>
--------------------------
mdadm --detail /dev/md0
--------------------------
/dev/md0:
Version : 1.2
Creation Time : Sun Jul 17 00:41:57 2011
Raid Level : raid6
Used Dev Size : 1953512960 (1863.02 GiB 2000.40 GB)
Raid Devices : 4
Total Devices : 4
Persistence : Superblock is persistent
Update Time : Sat Jun 8 11:00:43 2013
State : active, degraded, Not Started
Active Devices : 3
Working Devices : 4
Failed Devices : 0
Spare Devices : 1
Layout : left-symmetric-6
Chunk Size : 512K
New Layout : left-symmetric
Name : muncher:0 (local to host muncher)
UUID : 830b9ec8:ca8dac63:e31946a0:4c76ccf0
Events : 50599
Number Major Minor RaidDevice State
0 8 32 0 active sync /dev/sdc
1 8 48 1 active sync /dev/sdd
3 8 64 2 active sync /dev/sde
4 8 0 3 spare rebuilding /dev/sda
--------------------------
Any advice greatly appreciated.
Cheers,
Keith
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