I have reason to believe one HD in a RAID1 is dying. But I'm trying to
understand what the logs and results of various commands are telling me.
Searching on the Internet is very confusing. BTW, this is for and Ubuntu
Server 18.04.2 LTS.
It seems to me that the following information is telling me on device is
missing. It would seem to me that sda is gone.
Anyhow, for example, I received an email:
A DegradedArray event had been detected on md device /dev/md0.
Faithfully yours, etc.
P.S. The /proc/mdstat file currently contains the following:
Personalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5]
[raid4] [raid10]
md1 : active raid1 sdb2[1]
968949696 blocks [2/1] [_U]
md0 : active raid1 sdb1[1]
7811008 blocks [2/1] [_U]
unused devices: <none>
Looking at the logs:
[ 3.305090] md: kicking non-fresh sda2 from array!
[ 3.314209] md: kicking non-fresh sda1 from array!
[ 3.337251] md/raid1:md1: active with 1 out of 2 mirrors
[ 3.337270] md/raid1:md0: active with 1 out of 2 mirrors
[ 3.337296] md1: detected capacity change from 0 to 992204488704
[ 3.337305] md0: detected capacity change from 0 to 7998472192
The following command hopefully provides more info:
mdadm --examine /dev/sdb*
/dev/sdb:
MBR Magic : aa55
Partition[0] : 15622144 sectors at 2048 (type fd)
Partition[1] : 1937899520 sectors at 15624192 (type fd)
/dev/sdb1:
Magic : a92b4efc
Version : 0.90.00
UUID : 7414ac79:580af0ce:e6bbe02b:915fa44a
Creation Time : Wed Jul 18 15:00:44 2012
Raid Level : raid1
Used Dev Size : 7811008 (7.45 GiB 8.00 GB)
Array Size : 7811008 (7.45 GiB 8.00 GB)
Raid Devices : 2
Total Devices : 1
Preferred Minor : 0
Update Time : Mon Oct 14 16:28:54 2019
State : clean
Active Devices : 1
Working Devices : 1
Failed Devices : 0
Spare Devices : 0
Checksum : 9b89db2a - correct
Events : 417
Number Major Minor RaidDevice State
this 1 8 17 1 active sync /dev/sdb1
0 0 0 0 0 removed
1 1 8 17 1 active sync /dev/sdb1
/dev/sdb2:
Magic : a92b4efc
Version : 0.90.00
UUID : ac37ca92:939d7053:3b802bf3:08298597
Creation Time : Wed Jul 18 15:00:53 2012
Raid Level : raid1
Used Dev Size : 968949696 (924.06 GiB 992.20 GB)
Array Size : 968949696 (924.06 GiB 992.20 GB)
Raid Devices : 2
Total Devices : 1
Preferred Minor : 1
Update Time : Mon Oct 14 16:39:46 2019
State : clean
Active Devices : 1
Working Devices : 1
Failed Devices : 0
Spare Devices : 0
Checksum : 1418e24f - correct
Events : 46734
Number Major Minor RaidDevice State
this 1 8 18 1 active sync /dev/sdb2
0 0 0 0 0 removed
1 1 8 18 1 active sync /dev/sdb2
