Ive got an Problem with my JBOD, after my Synology DS died because of the failure of the Boot-HDD, ive wanted to recover my JBOD (3x3TB). Ive Started an Debian-Live to mount and save the data from my Jbod, that worked well.
I Ordered an 8Tb drive from amazon to save the data, but as i started the Rsync Job the middle Device (sdb) got i/o errors... My Fault was to think a reboot would help because of an unhandled Kernel error... Ye, dumb me, the middle Disk died.
My Problem now: Ive got the first and the last device working but mdadm said:
root@debian:~# mdadm --assemble --force /dev/md3 /dev/sd[bc]3
mdadm: /dev/md3 assembled from 2 drives - not enough to start the array.
Thats the Drives:
root@debian:/# mdadm --examine /dev/sd[abc]3 /dev/sdb3:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : e8937ad2:c0080cf8:6e96733a:2a3b4ee8
Name : LG-NAS:3
Creation Time : Sat Feb 25 20:08:20 2017
Raid Level : linear
Raid Devices : 3
Avail Dev Size : 5850889088 (2789.92 GiB 2995.66 GB)
Used Dev Size : 0
Data Offset : 2048 sectors
Super Offset : 8 sectors
Unused Space : before=1968 sectors, after=32 sectors
State : clean
Device UUID : baa0a4e4:9bc55ee7:6e6d27ea:fe158da8
Update Time : Thu Mar 9 15:20:28 2017
Checksum : 84051d55 - correct
Events : 1
Rounding : 64K
Device Role : Active device 0 Array State : AAA ('A' == active, '.' == missing, 'R' == replacing)
/dev/sdc3:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : e8937ad2:c0080cf8:6e96733a:2a3b4ee8
Name : LG-NAS:3
Creation Time : Sat Feb 25 20:08:20 2017
Raid Level : linear
Raid Devices : 3
Avail Dev Size : 5850889088 (2789.92 GiB 2995.66 GB)
Used Dev Size : 0
Data Offset : 2048 sectors
Super Offset : 8 sectors
Unused Space : before=1968 sectors, after=32 sectors
State : clean
Device UUID : 0b4313db:8989392c:870a02d2:910a8eb5
Update Time : Thu Mar 9 15:20:28 2017
Checksum : b42b1540 - correct
Events : 1
Rounding : 64K
Device Role : Active device 2 Array State : AAA ('A' == active, '.' == missing, 'R' == replacing)
root@debian:/# fdisk -l /dev/sd[abc]3
Disk /dev/sdb3: 2.7 TiB, 2995656278016 bytes, 5850891168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk /dev/sdc3: 2.7 TiB, 2995656278016 bytes, 5850891168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
root@debian:/# mdadm --examine --scan ARRAY /dev/md/3 metadata=1.2 UUID=e8937ad2:c0080cf8:6e96733a:2a3b4ee8 name=LG-NAS:3
My Last Idea now, to recreate the JBOD using the Following command:
mdadm --create --verbose /dev/md3 --name=LG-NAS:3 --metadata=1.2 --level=linear --raid-devices=3 /dev/sdb3 missing /dev/sdc3
Or
mdadm --create --verbose /dev/md3 --name=LG-NAS:3 --metadata=1.2 --level=linear --raid-devices=2 /dev/sdb3 /dev/sdc3
Any suggestions what to do next?
