Degraded raid 1

I have raid 1, status degraded, on a D-link DNS323 running the alt-F firmware.
I have run the commands below and think I now need to run:
mdadm --add /dev/md0 /dev/sda2
Any advice will be most welcome.
sfdisk -l -uS
Disk /dev/sda: 97451 cylinders, 255 heads, 63 sectors/track
Warning: The partition table looks like it was made
for C/H/S=*/256/63 (instead of 97451/255/63).
For this listing I'll assume that geometry.
Units = sectors of 512 bytes, counting from 0
Device Boot Start End #sectors Id System
/dev/sda1 1 - 4294967295 ee Intel EFI GUID Partition Table
/dev/sda2 0 - 0 0 Empty
/dev/sda3 0 - 0 0 Empty
/dev/sda4 0 - 0 0 Empty
Disk /dev/sdb: 97451 cylinders, 255 heads, 63 sectors/track
Warning: The partition table looks like it was made
for C/H/S=*/256/63 (instead of 97451/255/63).
For this listing I'll assume that geometry.
Units = sectors of 512 bytes, counting from 0
Device Boot Start End #sectors Id System
/dev/sdb1 1 - 4294967295 ee Intel EFI GUID Partition Table
/dev/sdb2 0 - 0 0 Empty
/dev/sdb3 0 - 0 0 Empty
/dev/sdb4 0 - 0 0 Empty
more /etc/mdadm.conf
ARRAY /dev/md/0 metadata=1.2 UUID=59691fcb:f60641ea:8008509f:b752ed83 name=dlink-and:0
DEVICES /dev/sd*
cat /proc/mdstat
Personalities : [linear] [raid1]
md0 : active raid1 sdb2[2]
2929741087 blocks super 1.2 [2/1] [_U]
bitmap: 8/22 pages [32KB], 65536KB chunk
unused devices:
mdadm --detail /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Sat Mar 16 23:54:30 2013
Raid Level : raid1
Array Size : 2929741087 (2794.02 GiB 3000.05 GB)
Used Dev Size : 2929741087 (2794.02 GiB 3000.05 GB)
Raid Devices : 2
Total Devices : 1
Persistence : Superblock is persistent
Intent Bitmap : Internal
Update Time : Wed Jan 12 01:14:11 2022 State : active, degraded
Active Devices : 1
Working Devices : 1
Failed Devices : 0
Spare Devices : 0
Name : dlink-and:0 (local to host dlink-and) UUID : 59691fcb:f60641ea:8008509f:b752ed83 Events : 28427 Number Major Minor RaidDevice State 0 0 0 0 removed 2 8 18 1 active sync /dev/sdb2
Comments
-
mdadm --add /dev/md0 /dev/sda2 worked fine:
mdadm --detail /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Sat Mar 16 23:54:30 2013
Raid Level : raid1
Array Size : 2929741087 (2794.02 GiB 3000.05 GB)
Used Dev Size : 2929741087 (2794.02 GiB 3000.05 GB)
Raid Devices : 2
Total Devices : 2
Persistence : Superblock is persistentIntent Bitmap : Internal
Update Time : Mon Jan 17 18:23:24 2022 State : active
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0Name : dlink-and:0 (local to host dlink-and) UUID : 59691fcb:f60641ea:8008509f:b752ed83 Events : 28568 Number Major Minor RaidDevice State 0 8 2 0 active sync /dev/sda2 2 8 18 1 active sync /dev/sdb2
0
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