I have a small Ubuntu 14.04 LTS server with two Type 1 arrays, primarily
for redundancy. Recently I started getting email with the above title.
I checked the array and one drive had failed. I replaced the drive, ran
fdisk to create a new Linux Raid Array partition (type fd) of exactly
the same size as the existing disk.
Then using gnome-disk-utility added the new drive to the array.
Apparently that added the entire disk, not the partition I created
however, everything seems to be working properly.
BUT I am still regularly getting the email below indicating a problem
with /dev/md1, even though I think I fixed the problem.
This is an automatically generated mail message from mdadm
running on thelma
A DegradedArray event had been detected on md device /dev/md1.
Faithfully yours, etc.
P.S. The /proc/mdstat file currently contains the following:
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md1 : active raid1 sdc1[0]
312567552 blocks [2/1] [U_]
md0 : active raid1 sda1[0] sdb1[1]
78148096 blocks [2/2] [UU]
unused devices: <none>
However mdadm reports:
root@thelma:~# mdadm --detail /dev/md1
/dev/md1:
Version : 0.90
Creation Time : Sun Mar 11 19:06:41 2007
Raid Level : raid1
Array Size : 312567552 (298.09 GiB 320.07 GB)
Used Dev Size : 312567552 (298.09 GiB 320.07 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 1
Persistence : Superblock is persistent
Update Time : Thu Apr 23 12:36:16 2015
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
UUID : a5865e80:27a899df:bfaac05b:eff3fc62
Events : 0.16313034
Number Major Minor RaidDevice State
0 8 33 0 active sync /dev/sdc1
1 8 48 1 active sync /dev/sdd
mdadm.conf contains the following:
root@thelma:/etc/mdadm# cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5]
[raid4] [raid10]
md1 : active raid1 sdc1[0] sdd[1]
312567552 blocks [2/2] [UU]
md0 : active raid1 sda1[0] sdb1[1]
78148096 blocks [2/2] [UU]
cat /proc/mdstat produces.
root@thelma:/etc/mdadm# cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5]
[raid4] [raid10]
md1 : active raid1 sdc1[0] sdd[1]
312567552 blocks [2/2] [UU]
md0 : active raid1 sda1[0] sdb1[1]
78148096 blocks [2/2] [UU]
unused devices: <none>
I'm not sure whether there is a real problem or how to fix it. It seems
some inaccurate configuration information is stored somewhere.
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