fix mdadm raid partition on ubuntu

should be an extremely quick fix for someone with mdadm lvm experience.

have a 4 drive USB3.0 external ext4 mdadm lvm raid-5 array connected to my Ubuntu 16.10 box (ripped from a broken Synology). Disk manager shows the array is fine and all the logical partitions are visible, however only 2 (of the 5) mount properly. The other 3 throw exit status 32 errors and dmesg says "Number of reserved GDT blocks insanely large: 8189"

A filesystem check on the partitions gives "Corruption found in superblock. (reserved_gdt_blocks = 8189)"

I've attempted to restore the superblocks on the partitions from backups using the e2fsck -b command but none of them work.

mdadm --examine --scan /dev/md127 gives no result

parted result: Error: /dev/md127: unrecognised disk label

Model: Linux Software RAID array (md)

Disk: /dev/md127: 8987GB Sector size: (logical/physical): 512B/512B

Partition Table: unknown

Disk flags:

Dmesg shows:

[ 41.648463] md/raid:md127: device sdb3 operational as raid disk 1

[ 41.649433] md/raid:md127: allocated 4374kB

[ 41.649675] md/raid:md127: raid level 5 active with 4 out of 4 devices, algorithm 2

[ 41.649675] RAID conf printout:

[ 41.649675] --- level:5 rd:4 wd:4

[ 41.649676] disk 0, o:1, dev:sdc3

[ 41.649677] disk 1, o:1, dev:sdb3

[ 41.649677] disk 2, o:1, dev:sde3

[ 41.649678] disk 3, o:1, dev:sdd3

[ 41.649697] md127: detected capacity change from 0 to 8987271954432

I can teamviewer the link to the person with the best experience to resolve this small but annoying issue.

Evner: Linux, System Administrator, Ubuntu

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