Ok, here's some output.
First, attempting to assemble the array based on uuid.
Code:
[root@localhost liveuser]# mdadm --assemble --scan --uuid "dbeab1fc:fbec2bad:b0a43543:72ffeee2"
mdadm: /dev/md/1 assembled from 2 drives - not enough to start the array.
mdadm: No arrays found in config file or automatically
Now trying to specify the drives to use.
Code:
[root@localhost ~]# mdadm -v --assemble /dev/md1 /dev/sda3 /dev/sdb3 /dev/sdd3
mdadm: looking for devices for /dev/md1
mdadm: /dev/sda3 is identified as a member of /dev/md1, slot 1.
mdadm: /dev/sdb3 is identified as a member of /dev/md1, slot 0.
mdadm: /dev/sdd3 is identified as a member of /dev/md1, slot 2.
mdadm: added /dev/sda3 to /dev/md1 as 1 (possibly out of date)
mdadm: added /dev/sdd3 to /dev/md1 as 2
mdadm: no uptodate device for slot 6 of /dev/md1
mdadm: added /dev/sdb3 to /dev/md1 as 0
mdadm: /dev/md1 assembled from 2 drives - not enough to start the array.
Now we examine all of the available drives.
Code:
[root@localhost liveuser]# for i in a b d;do mdadm --examine /dev/sd${i}3;done;
/dev/sda3:
Magic : a92b4efc
Version : 0.90.01
UUID : dbeab1fc:fbec2bad:b0a43543:72ffeee2
Creation Time : Thu Aug 8 20:36:44 2013
Raid Level : raid5
Used Dev Size : 487991872 (465.39 GiB 499.70 GB)
Array Size : 1463975616 (1396.16 GiB 1499.11 GB)
Raid Devices : 4
Total Devices : 4
Preferred Minor : 1
Update Time : Sun Jul 20 18:17:04 2014
State : clean
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Checksum : 678fc865 - correct
Events : 59722
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 1 8 19 1 active sync /dev/sdb3
0 0 8 3 0 active sync /dev/sda3
1 1 8 19 1 active sync /dev/sdb3
2 2 8 35 2 active sync
3 3 8 51 3 active sync /dev/sdd3
/dev/sdb3:
Magic : a92b4efc
Version : 0.90.01
UUID : dbeab1fc:fbec2bad:b0a43543:72ffeee2
Creation Time : Thu Aug 8 20:36:44 2013
Raid Level : raid5
Used Dev Size : 487991872 (465.39 GiB 499.70 GB)
Array Size : 1463975616 (1396.16 GiB 1499.11 GB)
Raid Devices : 4
Total Devices : 3
Preferred Minor : 1
Update Time : Tue Aug 26 22:40:13 2014
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 2
Spare Devices : 0
Checksum : 67c0cd55 - correct
Events : 59724
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 0 8 3 0 active sync /dev/sda3
0 0 8 3 0 active sync /dev/sda3
1 1 0 0 1 faulty removed
2 2 8 35 2 active sync
3 3 0 0 3 faulty removed
/dev/sdd3:
Magic : a92b4efc
Version : 0.90.01
UUID : dbeab1fc:fbec2bad:b0a43543:72ffeee2
Creation Time : Thu Aug 8 20:36:44 2013
Raid Level : raid5
Used Dev Size : 487991872 (465.39 GiB 499.70 GB)
Array Size : 1463975616 (1396.16 GiB 1499.11 GB)
Raid Devices : 4
Total Devices : 3
Preferred Minor : 1
Update Time : Tue Aug 26 22:40:13 2014
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 2
Spare Devices : 0
Checksum : 67c0cd79 - correct
Events : 59724
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 2 8 35 2 active sync
0 0 8 3 0 active sync /dev/sda3
1 1 0 0 1 faulty removed
2 2 8 35 2 active sync
3 3 0 0 3 faulty removed
What concerns me is the "active devices" for sdb and sdd, they both claim 2. Also that block at the bottom for each drive, stating devices. b and d both show only sda, while a shows all 3.