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I am facing strange problem with XFS file system. Below is the exact scenario:

I'd a corrupt 2 TB disk with XFS (I/O error), so that decide to rescue data from old disk to new disk.

I'd run ddrescue to rescue data to new disk. ddrescue finished successfully except 204 kB data. After that I was trying to mount the new disk but no luck. Below I am posting the ddrescue result and mount error. Please help me to solve the issue. I'll be really grateful.

ddrescue result:

# ddrescue --force -n /dev/sdc /dev/sde
GNU ddrescue 1.16
About to copy 2198 GB from /dev/sdc to /dev/sde
Starting positions:
Infile = 0 B, outfile = 0 B
Copy Block size: 128 sectors Initial skip size: 128 sectors Sectors size: 512 Bytes

Press Ctrl-C to interrupt
rescued : 2198 GB, errsize : 204 kB, current rate : 1560 B/s
Ipos : 68699 MB, errors : 15, average rate : 29103 KB/s
Opos : 68699 MB, time since last successful read : 0 s
Finished

# fdisk -l
Disk /dev/sdc: 2198.3 GB, 2198352166912 bytes 255 heads, 63 sectors/track, 267267 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System

/dev/sdc1 1 267350 2147483647+ ee EFI GPT

Disk /dev/sde: 2198.3 GB, 2198352166912 bytes 255 heads, 63 sectors/track, 267267 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sde1 1 267350 2147483647+ ee EFI GPT

# ls -l /dev/sd* brw-r----- 1 root disk 8, 0 Feb 28 02:00 /dev/sda
brw-r----- 1 root disk 8, 1 Feb 28 02:00 /dev/sda1
brw-r----- 1 root disk 8, 2 Feb 28 02:00 /dev/sda2
brw-r----- 1 root disk 8, 3 Feb 27 18:00 /dev/sda3
brw-r----- 1 root disk 8, 4 Feb 28 02:00 /dev/sda4
brw-r----- 1 root disk 8, 5 Feb 28 02:00 /dev/sda5
brw-r----- 1 root disk 8, 16 Feb 28 02:00 /dev/sdb
brw-r----- 1 root disk 8, 17 Feb 28 02:00 /dev/sdb1
brw-r----- 1 root disk 8, 32 Feb 28 02:00 /dev/sdc
brw-r----- 1 root disk 8, 48 Feb 28 02:00 /dev/sdd
brw-r----- 1 root disk 8, 49 Feb 28 02:00 /dev/sdd1
brw-r----- 1 root disk 8, 64 Feb 28 02:00 /dev/sde

Inside # fdisk -l command /dev/dec1 and /dev/sde1 missing

# parted -i /dev/sde print Model: DELL PERC 5/i (scsi)
Disk /dev/sde: 2198GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos

Number Start End Size Type File system Flags
1 32.3kB 2198GB 2198GB primary xfs

Information: Don't forget to update /etc/fstab, if necessary.

# mount -t xfs /dev/sde /mnt/mail3
mount: wrong fs type, bad option, bad superblock on /dev/sde, missing codepage or other error In some cases useful info is found in syslog - try
dmesg | tail or so

# dmesg | tail
XFS: bad magic number
XFS: SB validate failed

# tailf /var/log/messages
Feb 28 04:09:29 mail kernel: XFS: bad magic number
Feb 28 04:09:29 mail kernel: XFS: SB validate failed

# file -s /dev/sde
/dev/sde: x86 boot sector; partition 1: ID=0xee, starthead 0, startsector 1, 4294967295 sectors, extended partition table (last)\011

# xfs_check /dev/sde1
/dev/sde1: No such file or directory

fatal error -- couldn't initialize XFS library

# xfs_check /dev/sde
xfs_check: unexpected XFS SB magic number 0x00000000
xfs_check: read failed: Invalid argument
xfs_check: data size check failed
cache_node_purge: refcount was 1, not zero (node=0xdc92c20)
xfs_check: cannot read root inode (22)
bad superblock magic number 0, giving up

Please help and it will be highly appreciated.

  • Seems like ddrescue skipped 128 initial sectors - that would be all of the partition information. I would try to read it and add to the beginning of the secodnd disk, but notice that you wrote second disk without offset. – drookie Feb 27 '16 at 21:00
  • Hi @drookie, Thank you for your reply After ddrescure when I boot up the machine.... I am getting same error for the both disk sdc and sde. Previously the original disk only can mount but unable to read.... even cannot lists the directory using ls and now unable to mount both disk. please help – rh.mahfuz Feb 27 '16 at 21:05
  • Hi @drookie is the any solution.... any help will be highly appreciated. – rh.mahfuz Feb 29 '16 at 3:03

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