I am trying to recover the data from a single member of a RAID1 set that was in my poorly engineered Synology DS220J that now is in the trash can due to lack of warranty and failed power supply. I was never able to rebuild the mirror set with the replaced drive so now I am just trying to manually recover the data from the single drive. Since Synology formatted it with EXT4 I booted over to Ubuntu from Windows and stuck it in a USB3 SATA controller. I see it in the "disks" app and I see it using sudo lshw
*-scsi:3
physical id: d
logical name: scsi6
*-disk:0
description: SCSI Disk
product: Dual SATA Bridge
vendor: Sabrent
physical id: 0.0.0
bus info: scsi@6:0.0.0
logical name: /dev/sdd
version: 0
serial: 00000000000000000000
size: 5589GiB (6001GB)
capabilities: gpt-1.00 partitioned partitioned:gpt
configuration: ansiversion=6 guid=3e4e6f03-2149-4821-bbec-e3648ab1111c logicalsectorsize=512 sectorsize=4096
*-volume:0
description: EXT4 volume
vendor: Linux
physical id: 1
bus info: scsi@6:0.0.0,1
logical name: /dev/sdd1
version: 1.0
serial: e61a6158-2439-4b77-ad68-f39f55c1079d
size: 2431MiB
capacity: 2431MiB
capabilities: multi journaled extended_attributes large_files huge_files dir_nlink recover 64bit extents ext4 ext2 initialized
configuration: created=2023-05-01 12:06:59 filesystem=ext4 label=1.42.6-25426 lastmountpoint=/ modified=2023-06-20 19:01:04 mounted=2023-06-20 19:01:04 state=clean
*-volume:1
description: Linux swap volume
vendor: Linux
physical id: 2
bus info: scsi@6:0.0.0,2
logical name: /dev/sdd2
version: 1
serial: c14fce3a-f785-4ded-af6a-ec6b85487bbd
size: 2047MiB
capacity: 2047MiB
capabilities: multi swap initialized
configuration: filesystem=swap pagesize=4096
*-volume:2
description: RAID partition
vendor: Linux
physical id: 5
bus info: scsi@6:0.0.0,5
logical name: /dev/sdd5
serial: a4f5f484-eba9-4d38-9135-83687766591e
capacity: 5584GiB
capabilities: multi
It's that last bit with the 5.5GB
I can't mount it:
sudo mount -t ext4 /dev/sdd5 usb3 ─╯
mount: /home/nate/usb3: wrong fs type, bad option, bad superblock on /dev/sdd5, missing codepage or helper program, or other error.
and I can't mdadm it:
sudo mdadm --assemble --readonly ext4 /dev/sdd5 usb3 ─╯
mdadm: /dev/sdd5 is busy - skipping
mdadm: cannot open device usb3: Invalid argument
mdadm: usb3 has no superblock - assembly aborted
What can I do to get to the data on that drive? Surely it's still there.
Side note: usb3 is a directory under my home dir.
Other info:
sudo mdadm --examine /dev/sdd5 ─╯
/dev/sdd5:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : 3a7583b2:05793d15:cff6a40c:fbad9c4a
Name : SynologyNAS:2
Creation Time : Thu Nov 5 15:59:57 2020
Raid Level : raid1
Raid Devices : 2
Avail Dev Size : 11711382912 (5584.42 GiB 5996.23 GB)
Array Size : 5855691456 (5584.42 GiB 5996.23 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
Unused Space : before=1968 sectors, after=0 sectors
State : clean
Device UUID : cf1a234b:e6973349:c3cc71ae:294570f6
Update Time : Tue Jun 20 19:30:14 2023
Checksum : 5ca6bbb8 - correct
Events : 200438
Device Role : Active device 0
Array State : AA ('A' == active, '.' == missing, 'R' == replacing
and
sdd 8:48 0 5.5T 0 disk
├─sdd1 8:49 0 2.4G 0 part
├─sdd2 8:50 0 2G 0 part
└─sdd5 8:53 0 5.5T 0 part
└─osprober-linux-sdd5 253:0 0 5.5T 1 dm
└─md2 9:2 0 5.5T 1 raid1
more:
sudo mdadm --assemble --run /dev/md0 /dev/sdd5 --force ─╯
mdadm: /dev/sdd5 is busy - skipping
ugh
sudo mdadm --stop /dev/sdd5 ─╯
mdadm: /dev/sdd5 does not appear to be an md device
wtf
╰─ sudo cat /proc/mdstat ─╯
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md2 : inactive sdd5[2](S)
5855691456 blocks super 1.2
unused devices: <none>
Everything is obnoxiously dysfunctional in my special case. Nothing ever works for me especially if it works for everyone else in the whole world.
sudo mdadm --examine --scan >> /etc/mdadm/mdadm.conf ─╯
zsh: permission denied: /etc/mdadm/mdadm.conf
The above was fixed by doing it as the root user instead of sudo. None of what has worked in this scenario for others, has worked for me.
sudo mount /dev/md2 usb3 -o ro ─╯
mount: /home/nate/usb3: can't read superblock on /dev/md2
I give up
