short version: I have broken both partition tables, mdadm --examine shows:
root@geonas:~# mdadm --examine /dev/sda
/dev/sda:
MBR Magic : aa55
Partition[0] : 3907029167 sectors at 1 (type ee)
root@geonas:~# mdadm --examine /dev/sdb
/dev/sdb:
MBR Magic : aa55
Partition[0] : 3907029167 sectors at 1 (type ee)
any option I can regenerate it? from openmediavault logs maybe? Or via some scanning option?
whole story, if anyone is patient enough:
# at this point I had /dev/md127 with /dev/sdb running.
root@geonas:~# cat /proc/mdstat
Personalities : [raid1]
md127 : active raid1 sdb[1]
1953383488 blocks super 1.2 [2/1] [_U]
bitmap: 15/15 pages [60KB], 65536KB chunk
unused devices: <none>
#/dev/sda was separated and when using gdisk showing errors regarding partition table:
root@geonas:~# gdisk /dev/sda
GPT fdisk (gdisk) version 0.8.10
Caution! After loading partitions, the CRC doesn't check out!
Warning! Main partition table CRC mismatch! Loaded backup partition table
instead of main partition table!
Warning! One or more CRCs don't match. You should repair the disk!
Partition table scan:
MBR: protective
BSD: not present
APM: not present
GPT: damaged
While /dev/sdb (correctly attached to raid) was showing:
root@geonas:~# gdisk /dev/sdb
GPT fdisk (gdisk) version 0.8.10
Partition table scan:
MBR: not present
BSD: not present
APM: not present
GPT: not present
Creating new GPT entries.
Command (? for help):
additional info from fdisk -l:
root@geonas:~# fdisk -l /dev/sdb
Disk /dev/sdb: 1,8 TiB, 2000398934016 bytes, 3907029168 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@geonas:~# fdisk -l /dev/sda
Disk /dev/sda: 1,8 TiB, 2000398934016 bytes, 3907029168 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
Disklabel type: gpt
Disk identifier: E53B2EDE-21D3-4B37-8911-833B491F7D46
Device Start End Sectors Size Type
/dev/sda1 2048 3907029134 3907027087 1,8T Linux filesystem
#in the meantime fdisk -l changed to:
root@geonas:~# fdisk -l /dev/sda
The primary GPT table is corrupt, but the backup appears OK, so that will be used.
Disk /dev/sda: 1,8 TiB, 2000398934016 bytes, 3907029168 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
Disklabel type: gpt
Disk identifier: E53B2EDE-21D3-4B37-8911-833B491F7D46
Device Start End Sectors Size Type
/dev/sda1 2048 3907029134 3907027087 1,8T Linux filesystem
root@geonas:~# fdisk -l /dev/sdb
Disk /dev/sdb: 1,8 TiB, 2000398934016 bytes, 3907029168 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
I did:
root@geonas:~# sgdisk /dev/sdb -R /dev/sda
# shutdown, forgot to regenerate UUIDS
root@geonas:~# sgdisk -G /dev/sda
The operation has completed successfully.
# here I wanted to run gdisk to see if it still shows errors..
root@geonas:~# sgdisk /dev/sdb
Creating new GPT entries.
# freaked out that I messed with entries, so tried to recreate them from sda
root@geonas:~# sgdisk /dev/sda -R /dev/sdb
The operation has completed successfully.
