I must be missing something completely obvious, but I've read the man
page, and went through the archive for this list.
One of the hard drives in my raid array failed... I have taken the hard
drive out, replaced it with a new one, copied the partition table (using
gdisk) and then added the drive to the raid array with:
mdadm --add /dev/md0 /dev/sdb3
I then monitor it with "mdadm --detail /dev/md0" or "cat /proc/mdstat"
until it synchronizes
After an ungodly number of hours, the thing finishes synchronizing, but
the new drive only shows up as a spare. So the RAID is still degraded....
I have not been able to get the new drive to become part of the array as
active, web searches have proved useless (people with the same problem
and no resolution). I've even failed/removed the active drive, at which
point the spare becomes active, but when I add the original drive it
still adds it as a spare)
So how do I make it active???
(it's in the middle of trying again, but here's what I have)
--------------
root@frogstar:~# cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5]
[raid4] [raid10]
md0 : active raid1 sda3[2] sdb3[0]
1943454796 blocks super 1.2 [2/1] [U_]
[>....................] recovery = 1.0% (20096128/1943454796)
finish=737.0min speed=43493K/sec
unused devices: <none>
--------------
and
root@frogstar:~# mdadm --detail /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Sat Apr 14 13:52:25 2012
Raid Level : raid1
Array Size : 1943454796 (1853.42 GiB 1990.10 GB)
Used Dev Size : 1943454796 (1853.42 GiB 1990.10 GB)
Raid Devices : 2
Total Devices : 2
Persistence : Superblock is persistent
Update Time : Thu Jun 14 13:13:54 2012
State : clean, degraded, recovering
Active Devices : 1
Working Devices : 2
Failed Devices : 0
Spare Devices : 1
Rebuild Status : 1% complete
Name : frogstar:0 (local to host frogstar)
UUID : 88ed6cd4:de463005:31ed764c:2b23a266
Events : 47610
Number Major Minor RaidDevice State
0 8 19 0 active sync /dev/sdb3
2 8 3 1 spare rebuilding /dev/sda3
The version of mdadm I'm using is the stock on ubuntu 10.10 (v3.1.4)
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