Here's the output of -E for sdf1 and one other, in case it's needed.
As I understand it the UUID is what has to do with the superblock, but
UUID's match between them.
mdadm -E /dev/sdf1
/dev/sdf1:
Magic : a92b4efc
Version : 0.90.00
UUID : 714a612d:9bd35197:36c91ae3:c168144d
Creation Time : Fri Jun 15 15:52:05 2012
Raid Level : raid6
Used Dev Size : 1953503872 (1863.01 GiB 2000.39 GB)
Array Size : 9767519360 (9315.03 GiB 10001.94 GB)
Raid Devices : 7
Total Devices : 7
Preferred Minor : 127
Update Time : Sat Sep 2 01:00:37 2017
State : active
Active Devices : 6
Working Devices : 6
Failed Devices : 1
Spare Devices : 0
Checksum : cd217ebc - correct
Events : 11559404
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 5 8 65 5 active sync /dev/sde1
0 0 8 81 0 active sync /dev/sdf1
1 1 8 33 1 active sync /dev/sdc1
2 2 8 17 2 active sync
3 3 65 129 3 active sync /dev/sdy1
4 4 8 49 4 active sync /dev/sdd1
5 5 8 65 5 active sync /dev/sde1
6 6 0 0 6 faulty removed
*****************************
mdadm -E /dev/sda1
/dev/sda1:
Magic : a92b4efc
Version : 0.91.00
UUID : 714a612d:9bd35197:36c91ae3:c168144d
Creation Time : Fri Jun 15 15:52:05 2012
Raid Level : raid6
Used Dev Size : 1953503872 (1863.01 GiB 2000.39 GB)
Array Size : 11721023232 (11178.04 GiB 12002.33 GB)
Raid Devices : 8
Total Devices : 6
Preferred Minor : 127
Reshape pos'n : 3799296 (3.62 GiB 3.89 GB)
Delta Devices : 1 (7->8)
Update Time : Wed Oct 4 12:49:57 2017
State : clean
Active Devices : 6
Working Devices : 6
Failed Devices : 2
Spare Devices : 0
Checksum : ce71a9cb - correct
Events : 11559681
Layout : left-symmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 3 8 1 3 active sync /dev/sda1
0 0 8 97 0 active sync /dev/sdg1
1 1 8 49 1 active sync /dev/sdd1
2 2 8 33 2 active sync /dev/sdc1
3 3 8 1 3 active sync /dev/sda1
4 4 8 65 4 active sync /dev/sde1
5 5 0 0 5 faulty removed
6 6 8 16 6 active /dev/sdb
7 7 0 0 7 faulty removed
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