I have a working hard drive that stopped being able to read the nilfs2
partition after a low battery laptop shutdown
There is no fsck function available, and I failed to copy the image and
reinstall to a reformated partition- as explained below.
Can someone please suggest how to recover the data?
When mounting the partition with
mount -t "nilfs2" -o "uhelper=udisks2,nodev,nosuid" "/dev/sdb2"
"/media/user/Unallocated"
or
mount -t "nilfs2" -o "errors=continue,uhelper=udisks2,nodev,nosuid"
"/dev/sdb2" "/media/user/Unallocated"
I get an I/O error "Error while mounting... Input/output error"
output of dmesg
[ 3521.639526] NILFS (sdb2): mounting unchecked fs
[ 3524.672660] ata2.00: exception Emask 0x0 SAct 0x3e000 SErr 0x0 action 0x0
[ 3524.672668] ata2.00: irq_stat 0x40000008
[ 3524.672673] ata2.00: failed command: READ FPDMA QUEUED
[ 3524.672681] ata2.00: cmd 60/40:68:c0:5d:ba/05:00:e3:00:00/40 tag 13
ncq dma 688128 in
res 41/40:00:e0:60:ba/00:00:e3:00:00/40 Emask
0x409 (media error) <F>
[ 3524.672684] ata2.00: status: { DRDY ERR }
[ 3524.672687] ata2.00: error: { UNC }
[ 3524.686112] ata2.00: configured for UDMA/133
[ 3524.686206] sd 1:0:0:0: [sdb] tag#13 FAILED Result: hostbyte=DID_OK
driverbyte=DRIVER_SENSE
[ 3524.686210] sd 1:0:0:0: [sdb] tag#13 Sense Key : Medium Error [current]
[ 3524.686213] sd 1:0:0:0: [sdb] tag#13 Add. Sense: Unrecovered read
error - auto reallocate failed
[ 3524.686218] sd 1:0:0:0: [sdb] tag#13 CDB: Read(10) 28 00 e3 ba 5d c0
00 05 40 00
[ 3524.686221] print_req_error: I/O error, dev sdb, sector 3820642528
[ 3524.686272] ata2: EH complete
[ 3527.523500] ata2.00: exception Emask 0x0 SAct 0x4000000 SErr 0x0
action 0x0
[ 3527.523507] ata2.00: irq_stat 0x40000008
[ 3527.523510] ata2.00: failed command: READ FPDMA QUEUED
[ 3527.523514] ata2.00: cmd 60/08:d0:e0:60:ba/00:00:e3:00:00/40 tag 26
ncq dma 4096 in
res 41/40:00:e0:60:ba/00:00:e3:00:00/40 Emask
0x409 (media error) <F>
[ 3527.523516] ata2.00: status: { DRDY ERR }
[ 3527.523517] ata2.00: error: { UNC }
[ 3527.536847] ata2.00: configured for UDMA/133
[ 3527.536869] sd 1:0:0:0: [sdb] tag#26 FAILED Result: hostbyte=DID_OK
driverbyte=DRIVER_SENSE
[ 3527.536874] sd 1:0:0:0: [sdb] tag#26 Sense Key : Medium Error [current]
[ 3527.536878] sd 1:0:0:0: [sdb] tag#26 Add. Sense: Unrecovered read
error - auto reallocate failed
[ 3527.536885] sd 1:0:0:0: [sdb] tag#26 CDB: Read(10) 28 00 e3 ba 60 e0
00 00 08 00
[ 3527.536887] print_req_error: I/O error, dev sdb, sector 3820642528
[ 3527.536927] ata2: EH complete
[ 3527.536930] NILFS (sdb2): I/O error reading segment
[ 3527.536932] NILFS (sdb2): error -5 while searching super root
--------------------------------------
I tried to clone the partition with partclone using this command
sudo partclone.nilfs2 -c -d -s /dev/sdb2 | gzip -c > /dev/sdb1/sdb2.gz
, but received this error in the logfile:
-------------------
Partclone v0.3.6 http://partclone.org
Starting to clone device (/dev/sdb2) to image (-)
UID is root.
source=/dev/sdb2, target=-
open source file/device /dev/sdb2
open target file/device -
Initiate image options - version 0002
Initial image hdr - get Super Block from partition
Reading Super Block
nilfsclone.c: cannot open NILFS on /dev/sdb2: Invalid argument
-------------------
I don't know if this is helpful, but here is the output of nilfs-tune
$ sudo nilfs-tune -l /dev/sdb2
[sudo] password for user:
nilfs-tune 2.2.6
Filesystem volume name: Unallocated
Filesystem UUID: 17d750ba-5656-40f5-9b6a-1a608f6d6108
Filesystem magic number: 0x3434
Filesystem revision #: 2.0
Filesystem features: (none)
Filesystem state: invalid or mounted
Filesystem OS type: Linux
Block size: 4096
Filesystem created: Mon Oct 23 19:49:38 2017
Last mount time: Fri Dec 1 15:10:48 2017
Last write time: Fri Dec 1 16:39:31 2017
Mount count: 32
Maximum mount count: 50
Reserve blocks uid: 0 (user root)
Reserve blocks gid: 0 (group root)
First inode: 11
Inode size: 128
DAT entry size: 32
Checkpoint size: 192
Segment usage size: 16
Number of segments: 61625
Device size: 516950065152
First data block: 1
# of blocks per segment: 2048
Reserved segments %: 5
Last checkpoint #: 449665
Last block address: 115409102
Last sequence #: 114861
Free blocks count: 30955520
Commit interval: 0
# of blks to create seg: 0
CRC seed: 0x157de9a6
CRC check sum: 0xb33a8ce1
CRC check data size: 0x00000118
user@user:~$ nilfs-utils
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