I have 3 RAID5 devices. When I assemble them, I end up with a RAID0 device.
What is the cause? What is the solution?
All I can think of is the fact that there is only 1 active device. I had
2 but then manually failed it. I want to reassemble a RAID5 array and
then re-add the second device.
mdadm -E /dev/sdc2 /dev/sdd /dev/sde
/dev/sdc2:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x1
Array UUID : f8c0d29d:9b5986a4:050ca914:3a2fb8c8
Name : dave:0 (local to host dave)
Creation Time : Fri Oct 6 10:46:50 2017
Raid Level : raid5
Raid Devices : 3
Avail Dev Size : 7813726208 (3725.88 GiB 4000.63 GB)
Array Size : 7630592 (7.28 GiB 7.81 GB)
Used Dev Size : 7630592 (3.64 GiB 3.91 GB)
Data Offset : 262144 sectors
Super Offset : 8 sectors
Unused Space : before=262064 sectors, after=7806142351 sectors
State : clean
Device UUID : 0fe7e674:e1149499:7acb8853:c71fed62
Internal Bitmap : 8 sectors from superblock
Update Time : Sun Nov 19 13:53:23 2017
Bad Block Log : 512 entries available at offset 24 sectors
Checksum : 79ee1226 - correct
Events : 51526
Layout : left-symmetric
Chunk Size : 64K
Device Role : Active device 0
Array State : A.. ('A' == active, '.' == missing, 'R' == replacing)
/dev/sdd:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x1
Array UUID : f8c0d29d:9b5986a4:050ca914:3a2fb8c8
Name : dave:0 (local to host dave)
Creation Time : Fri Oct 6 10:46:50 2017
Raid Level : raid5
Raid Devices : 3
Avail Dev Size : 7813709489 (3725.87 GiB 4000.62 GB)
Array Size : 7630592 (7.28 GiB 7.81 GB)
Used Dev Size : 7630592 (3.64 GiB 3.91 GB)
Data Offset : 262144 sectors
Super Offset : 8 sectors
Unused Space : before=262064 sectors, after=7806078897 sectors
State : clean
Device UUID : ce2c8c03:f47f505b:c9a34e9a:668b70f5
Internal Bitmap : 8 sectors from superblock
Update Time : Sun Nov 19 13:53:23 2017
Bad Block Log : 512 entries available at offset 16 sectors
Checksum : a398c591 - correct
Events : 51526
Layout : left-symmetric
Chunk Size : 64K
Device Role : spare
Array State : A.. ('A' == active, '.' == missing, 'R' == replacing)
/dev/sde:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x1
Array UUID : f8c0d29d:9b5986a4:050ca914:3a2fb8c8
Name : dave:0 (local to host dave)
Creation Time : Fri Oct 6 10:46:50 2017
Raid Level : raid5
Raid Devices : 3
Avail Dev Size : 7813709489 (3725.87 GiB 4000.62 GB)
Array Size : 7630592 (7.28 GiB 7.81 GB)
Used Dev Size : 7630592 (3.64 GiB 3.91 GB)
Data Offset : 262144 sectors
Super Offset : 8 sectors
Unused Space : before=262064 sectors, after=7806078897 sectors
State : clean
Device UUID : aecb9ce3:e7bc161f:9b8d1764:db815dde
Internal Bitmap : 8 sectors from superblock
Update Time : Sun Nov 19 13:53:23 2017
Bad Block Log : 512 entries available at offset 16 sectors
Checksum : fa2581ac - correct
Events : 51526
Layout : left-symmetric
Chunk Size : 64K
Device Role : spare
Array State : A.. ('A' == active, '.' == missing, 'R' == replacing)
mdadm -D /dev/md0
/dev/md0:
Version : 1.2
Raid Level : raid0
Total Devices : 3
Persistence : Superblock is persistent
State : inactive
Name : dave:0 (local to host dave)
UUID : f8c0d29d:9b5986a4:050ca914:3a2fb8c8
Events : 51526
Number Major Minor RaidDevice
- 8 64 - /dev/sde
- 8 34 - /dev/sdc2
- 8 48 - /dev/sdd
null
