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[solved] Need help: Recover data from Seagate NAS
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hoacker
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PostPosted: Sat Aug 06, 2016 12:04 pm    Post subject: [solved] Need help: Recover data from Seagate NAS Reply with quote

Hi there.

This week my wifes NAS stopped working, which reminded me that a backup plan was still on my todo list. :oops: Maybe someone can help me recovering the files?

NAS:
SEAGATE business storage 2-bay NAS (SRN02D) with 2 x 2TB HDDs
RAID 1

After switching on the NAS this Thursday the NAS did not serve a network share and had a different name. I tried to login to web admin interface but all i got was a page with only the "disk manager" showing no other admin options. The disk list showed two disks but no raid configuration.

I removed the disks from case and attached them to my gentoo machine. Both seem to have identical partitioning.

Code:
# ls /dev | grep sdc
sdc
sdc1


Code:
# fdisk -l /dev/sdc
Festplatte /dev/sdc: 1,8 TiB, 2000398934016 Bytes, 3907029168 Sektoren
Einheiten: Sektoren von 1 * 512 = 512 Bytes
Sektorgröße (logisch/physikalisch): 512 Bytes / 512 Bytes
E/A-Größe (minimal/optimal): 512 Bytes / 512 Bytes
Festplattenbezeichnungstyp: gpt
Festplattenbezeichner: D7A4472F-86DE-4A8B-9ECD-989A32CBF972

Gerät       Anfang       Ende   Sektoren Größe Typ
/dev/sdc1       41       1953       1913 956,5K Microsoft Basisdaten
/dev/sdc2     2048    1953791    1951744   953M Microsoft Basisdaten
/dev/sdc3  1953792    3905535    1951744   953M Microsoft Basisdaten
/dev/sdc4  3905536    3926015      20480    10M Microsoft Basisdaten
/dev/sdc5  3926016    5879807    1953792   954M Microsoft Basisdaten
/dev/sdc6  5879808    5900287      20480    10M Microsoft Basisdaten
/dev/sdc7  5900288    5922815      22528    11M Microsoft Basisdaten
/dev/sdc8  5922816    6504447     581632   284M Microsoft Basisdaten
/dev/sdc9  6504448    8503295    1998848   976M Microsoft Basisdaten
/dev/sdc10 8503296 3907027254 3898523959   1,8T Microsoft Basisdaten


So, partition sdc10 seems to be the data partition, but only sdc1 shows up in /dev. How come?

Currently I dd a raid disk to an other HDD so I can try to recover files from the copy.

Anyone has an idea how I can mount the data partition?


Last edited by hoacker on Sun Aug 07, 2016 4:55 pm; edited 1 time in total
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frostschutz
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Joined: 22 Feb 2005
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PostPosted: Sat Aug 06, 2016 1:20 pm    Post subject: Reply with quote

What does it look like in dmesg? mdadm --examine /dev/sdc*?

Perhaps your kernel is missing EFI/GPT support? zgrep PARTITION /proc/config.gz

You can map the partition with a loop device ( losetup --find --show --read-only --offset $((512*startsectornumber)) /dev/sdc )
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NeddySeagoon
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Joined: 05 Jul 2003
Posts: 44477
Location: 56N 3W

PostPosted: Sat Aug 06, 2016 1:42 pm    Post subject: Reply with quote

hoacker,

With
Code:
Festplattenbezeichnungstyp: gpt
you also get a free protective MSDOS partition table that has a single partition of type 0xee.
This serves to warn that GPT is in use. Its all the kernel will see if you don't have GPT support.
_________________
Regards,

NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.
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hoacker
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PostPosted: Sat Aug 06, 2016 3:33 pm    Post subject: Reply with quote

Thank you! Indeed I'm missing GPT support in my kernel. Adding GPT and waiting for dd to finish...
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hoacker
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PostPosted: Sun Aug 07, 2016 4:08 pm    Post subject: Reply with quote

All partitions show up and the data partition seems to be intact. This is what mdadm says:

Code:
# mdadm -E /dev/sdc10
/dev/sdc10:
          Magic : a92b4efc
        Version : 1.2
    Feature Map : 0x0
     Array UUID : 890d1adc:b9216237:2dffd17d:96cb7b61
           Name : BA-0010755E84B4:8
  Creation Time : Sat Jun 21 10:55:58 2014
     Raid Level : raid1
   Raid Devices : 2

 Avail Dev Size : 3898521911 (1858.96 GiB 1996.04 GB)
     Array Size : 1949260819 (1858.96 GiB 1996.04 GB)
  Used Dev Size : 3898521638 (1858.96 GiB 1996.04 GB)
    Data Offset : 2048 sectors
   Super Offset : 8 sectors
   Unused Space : before=1968 sectors, after=273 sectors
          State : clean
    Device UUID : c1ae1257:ab598b0a:29752c46:2aff8f3d

    Update Time : Wed Aug  3 15:58:27 2016
       Checksum : d72c6be5 - correct
         Events : 2


   Device Role : Active device 0
   Array State : AA ('A' == active, '.' == missing, 'R' == replacing)


I set up a raid array with this partition...
Code:
# cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 sdc10[0]
      1949260819 blocks super 1.2 [2/1] [U_]
     
unused devices: <none>


.. but I cannot mount.
Code:
# mount /dev/md0 /mnt/tmp
mount: unbekannter Dateisystemtyp »LVM2_member«


This is what lvs tells me:
Code:
# lvs
  /run/lvm/lvmetad.socket: connect failed: Datei oder Verzeichnis nicht gefunden
  WARNING: Failed to connect to lvmetad. Falling back to internal scanning.
  LV   VG   Attr       LSize Pool Origin Data%  Meta%  Move Log Cpy%Sync Convert
  lv8  vg8  -wi-a----- 1,82t


So I do
Code:
# vgchange -ay vg8
  /run/lvm/lvmetad.socket: connect failed: Datei oder Verzeichnis nicht gefunden
  WARNING: Failed to connect to lvmetad. Falling back to internal scanning.
  1 logical volume(s) in volume group "vg8" now active
# mount /dev/vg8/lv8 /mnt/tmp
mount: Falscher Dateisystemtyp, ungültige Optionen, der
Superblock von /dev/mapper/vg8-lv8 ist beschädigt, fehlende
Kodierungsseite oder ein anderer Fehler
# tail /var/log/messages
Aug  7 18:04:02 fanny kernel: EXT4-fs (dm-0): bad block size 65536


What to do now?
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hoacker
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PostPosted: Sun Aug 07, 2016 4:55 pm    Post subject: Reply with quote

Got it! Fetched os-fuse-umfuse-ext2 from github and mounted the volume.

Code:
# fuse-ext2 -o rw+ /dev/vg8/lv8 /mnt/tmp
fuse-umfuse-ext2: version:'0.4+pexip2', fuse_version:'29' [main (fuse-ext2.c:343)]
fuse-umfuse-ext2: enter [do_probe (do_probe.c:31)]
fuse-umfuse-ext2: leave [do_probe (do_probe.c:61)]
fuse-umfuse-ext2: opts.device: /dev/vg8/lv8 [main (fuse-ext2.c:370)]
fuse-umfuse-ext2: opts.mnt_point: /mnt/tmp [main (fuse-ext2.c:371)]
fuse-umfuse-ext2: opts.volname:  [main (fuse-ext2.c:372)]
fuse-umfuse-ext2: opts.options: rw+ [main (fuse-ext2.c:373)]
fuse-umfuse-ext2: parsed_options: rw,fsname=/dev/vg8/lv8 [main (fuse-ext2.c:374)]
fuse-umfuse-ext2: mounting read-write [main (fuse-ext2.c:388)]


Solved!
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