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How can i fix this degraded raid? Someone can help me to figure out?

...but i am not sure i am adding the correct drive / partition. Possible for someone to confirm the command i need to use for this?

Thank you,

[root@host ~]# mdadm --detail /dev/md*
mdadm: /dev/md does not appear to be an md device
/dev/md2:
Version : 0.90
Creation Time : Sun Nov 3 01:42:24 2013
Raid Level : raid1
Array Size : 307198912 (292.97 GiB 314.57 GB)
Used Dev Size : 307198912 (292.97 GiB 314.57 GB)
Raid Devices : 2
Total Devices : 1
Preferred Minor : 2
Persistence : Superblock is persistent

Update Time : Wed Dec 18 12:31:45 2013
State : clean, degraded 
Active Devices : 1
Working Devices : 1
Failed Devices : 0
Spare Devices : 0

UUID : 92707d2b:a91fF102:a4d2adc2:26fd5302
Events : 0.601403

Number Major Minor RaidDevice State
0 8 2 0 active sync /dev/sda2
1 0 0 1 removed
/dev/md4:
Version : 0.90
Creation Time : Sun Nov 3 01:42:30 2013
Raid Level : raid1
Array Size : 1629926336 (1554.42 GiB 1669.04 GB)
Used Dev Size : 1629926336 (1554.42 GiB 1669.04 GB)
Raid Devices : 2
Total Devices : 1
Preferred Minor : 4
Persistence : Superblock is persistent

Update Time : Wed Dec 18 12:31:52 2013
State : active, degraded 
Active Devices : 1
Working Devices : 1
Failed Devices : 0
Spare Devices : 0

UUID : 731d0588:afdc5dc4:a4d2add2:26fb5352
Events : 0.3394981

Number Major Minor RaidDevice State
0 8 4 0 active sync /dev/sda4
1 0 0 1 removed








[root@host ~]# cat /proc/mdstat 
Personalities : [raid1] 
md4 : active raid1 sda4[0]
1629926336 blocks [2/1] [U_]

md2 : active raid1 sda2[0]
307198912 blocks [2/1] [U_]

unused devices: <none>
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