Hello everyone,
my Raid5 went missing after adding a new disk to it.
Before growing: 3x disk 10TB
After growing: 4x disk 10TB
I added the new disk with
mdadm --add /dev/md0 /dev/sda
--> somehow the new disk showed up as sda !?
and grew the Raid with
mdadm --grow --raid-devices=4
Everything went fine. My Raid grew and the new storage space showed up in the WebGUI.
I copied some files to it an shut it down.
After rebooting my Raid went missing. I have no idea what went wrong.
I hope you can help me. Thank you very much!
Release: 4.1.19-1
Codename: Arrakis
Output results:
1. cat /proc/mdstat
Code
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md0 : inactive sdb[0](S) sdd[2](S) sdc[1](S)
29298921984 blocks super 1.2
unused devices: <none>
2. blkid
Code
/dev/sdb: UUID="430dadae-5f1c-40c9-c3a5-a8d515749f6c" UUID_SUB="945f5477-7c7f-97b5-cf6d-60701af938fb" LABEL="openmediavault:SimonsNAS" TYPE="linux_raid_member"
/dev/sdd: UUID="430dadae-5f1c-40c9-c3a5-a8d515749f6c" UUID_SUB="177204c9-dfb9-f78c-725b-b9861fe857b6" LABEL="openmediavault:SimonsNAS" TYPE="linux_raid_member"
/dev/sdc: UUID="430dadae-5f1c-40c9-c3a5-a8d515749f6c" UUID_SUB="921d4d34-4ee0-dc0a-1ef0-6c014035953c" LABEL="openmediavault:SimonsNAS" TYPE="linux_raid_member"
/dev/sde1: UUID="4bc0abc4-ac0f-4814-a4f4-e51213828b15" TYPE="ext4" PARTUUID="0286303e-01"
/dev/sde5: UUID="02284066-1848-411d-9a57-7d952e67d8a7" TYPE="swap" PARTUUID="0286303e-05"
/dev/sda1: PARTUUID="69221752-7171-483e-a28f-ae7d83f81caf"
3. fdisk -l | grep "Disk "
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Disk /dev/sdb: 9,1 TiB, 10000831348736 bytes, 19532873728 sectors
Disk /dev/sdd: 9,1 TiB, 10000831348736 bytes, 19532873728 sectors
Disk /dev/sda: 9,1 TiB, 10000831348736 bytes, 19532873728 sectors
Disk identifier: 460B81D3-EA0D-4E21-ABD4-92B84661D883
Disk /dev/sdc: 9,1 TiB, 10000831348736 bytes, 19532873728 sectors
Disk /dev/sde: 59,6 GiB, 64023257088 bytes, 125045424 sectors
Disk identifier: 0x0286303e
4. cat /etc/mdadm/mdadm.conf
Code
#
# Please refer to mdadm.conf(5) for information about this file.
#
# by default, scan all partitions (/proc/partitions) for MD superblocks.
# alternatively, specify devices to scan, using wildcards if desired.
# Note, if no DEVICE line is present, then "DEVICE partitions" is assumed.
# To avoid the auto-assembly of RAID devices a pattern that CAN'T match is
# used if no RAID devices are configured.
DEVICE partitions
# auto-create devices with Debian standard permissions
CREATE owner=root group=disk mode=0660 auto=yes
# automatically tag new arrays as belonging to the local system
HOMEHOST <system>
# definitions of existing MD arrays
ARRAY /dev/md0 metadata=1.2 name=openmediavault:SimonsNAS UUID=430dadae:5f1c40c9:c3a5a8d5:15749f6c
# instruct the monitoring daemon where to send mail alerts
MAILADDR *****_******@web.de
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5. mdadm --detail --scan --verbose