I have a raid5 array with 3 disks, that fails to assemble.
Is there anything I can do to assemble this array and recover data? Is it recommended to try "mdadm --assemble --scan --force"?
Thanks for any help.
Output from mdadm /dev/sd[bcd]:
/dev/sdb:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : e33fa6c7:74531e39:2bfad3d9:6ca85398
Name : ubuntu:0
Creation Time : Wed May 20 22:00:51 2015
Raid Level : raid5
Raid Devices : 3
Avail Dev Size : 5860271024 (2794.40 GiB 3000.46 GB)
Array Size : 5860270080 (5588.79 GiB 6000.92 GB)
Used Dev Size : 5860270080 (2794.39 GiB 3000.46 GB)
Data Offset : 262144 sectors
Super Offset : 8 sectors
State : active
Device UUID : 85342508:2d7db0bb:8882a854:eea2269e
Update Time : Wed Oct 10 12:41:54 2018
Checksum : dcf78cf7 - correct
Events : 742277
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 1
Array State : .AA ('A' == active, '.' == missing)
/dev/sdc:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : e33fa6c7:74531e39:2bfad3d9:6ca85398
Name : ubuntu:0
Creation Time : Wed May 20 22:00:51 2015
Raid Level : raid5
Raid Devices : 3
Avail Dev Size : 5860271024 (2794.40 GiB 3000.46 GB)
Array Size : 5860270080 (5588.79 GiB 6000.92 GB)
Used Dev Size : 5860270080 (2794.39 GiB 3000.46 GB)
Data Offset : 262144 sectors
Super Offset : 8 sectors
State : clean
Device UUID : f13de21b:060f8819:f8d4b277:936fdb78
Update Time : Sun Sep 2 05:03:08 2018
Checksum : 4c0d0669 - correct
Events : 882
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 0
Array State : AAA ('A' == active, '.' == missing)
/dev/sdd:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : e33fa6c7:74531e39:2bfad3d9:6ca85398
Name : ubuntu:0
Creation Time : Wed May 20 22:00:51 2015
Raid Level : raid5
Raid Devices : 3
Avail Dev Size : 5860271024 (2794.40 GiB 3000.46 GB)
Array Size : 5860270080 (5588.79 GiB 6000.92 GB)
Used Dev Size : 5860270080 (2794.39 GiB 3000.46 GB)
Data Offset : 262144 sectors
Super Offset : 8 sectors
State : clean
Device UUID : e01a9d25:f51f4b11:6a7df8b1:ed946164
Update Time : Wed Oct 10 13:19:44 2018
Checksum : 7392165b - correct
Events : 742284
Layout : left-symmetric
Chunk Size : 512K
Device Role : Active device 2
Array State : ..A ('A' == active, '.' == missing)
And, output from "mdadm --assemble --scan -v":
mdadm: looking for devices for further assembly
mdadm: no recogniseable superblock on /dev/sde
mdadm: no RAID superblock on /dev/sda3
mdadm: no RAID superblock on /dev/sda2
mdadm: no RAID superblock on /dev/sda1
mdadm: no RAID superblock on /dev/sda
mdadm: /dev/sdd is identified as a member of /dev/md/ubuntu:0, slot 2.
mdadm: /dev/sdc is identified as a member of /dev/md/ubuntu:0, slot 0.
mdadm: /dev/sdb is identified as a member of /dev/md/ubuntu:0, slot 1.
mdadm: added /dev/sdc to /dev/md/ubuntu:0 as 0 (possibly out of date)
mdadm: added /dev/sdb to /dev/md/ubuntu:0 as 1 (possibly out of date)
mdadm: added /dev/sdd to /dev/md/ubuntu:0 as 2
mdadm: /dev/md/ubuntu:0 assembled from 1 drive - not enough to start the array.
mdadm: looking for devices for further assembly
mdadm: No arrays found in config file or automatically
