Re: Recovering XFS Partition of Type FAT16

Dave Chinner
2011-07-04T12:49:11Z

On Mon, Jul 04, 2011 at 10:23:55AM +0000, Volkan YAZICI wrote:
> Hi,
>
> I have an XFS partition, which is
>
> 1) Mistakenly quick formatted as FAT16.
> 2) At first, I couldn't see in "fdisk -l" that it is set to FAT16,
> instead of Linux. Hence, tried to fix it with xfs_recover. xfs_recover
> returned 0, and mount operation succeeded; but mounted fs size
> appeared as 20GB (despite it is 350GB) and almost every file was
> missing.
> 3) Later, I set the type of /dev/sda1 (the only partition in /dev/sda)
> to Linux, re-run xfs_recover, but nothing changed: Same fs size (20GB)
> and same missing files.

What is this xfs_recover tool you speak of? I've never heard of it,
I can't find any direct links to it in google (only forum posts from
years ago about how great it is) so I have no idea what you've done to
your filesystem...

> I open the system with Knoppix, and below are the partition
> diagnostics. I need urgent help to recover the files. I will be
> really, really appreciated for any help! (If you need further
> information, just drop me a mail.)
>
>
> Best.
>
>
> # fdisk -l
>
> Disk /dev/sda: 320.1 GB, 320072933376 bytes
> 255 heads, 63 sectors/track, 38913 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes
> Sector size (logical/physical): 512 bytes / 512 bytes
> I/O size (minimum/optimal): 512 bytes / 512 bytes
> Disk identifier: 0x447c435f
>
> Device Boot Start End Blocks Id System
> /dev/sda1 * 1 38913 312568641 83 Linux
>
>
> # mount | grep /dev/sda1
> /dev/sda1 on /media/sda1 type xfs (rw,relatime,attr2,noquota)
>
>
> # df -h | grep /dev/sda1
> /dev/sda1 19G 4,2G 15G 23% /media/sda1
>
> # xfs_info /mnt/sda1
> meta-data=/dev/sda1 isize=256 agcount=4, agsize=1226963 blks
> = sectsz=512 attr=2
> data = bsize=4096 blocks=4907849, imaxpct=25
> = sunit=0 swidth=0 blks
> naming =version 2 bsize=4096 ascii-ci=0
> log =internal bsize=4096 blocks=2560, version=2
> = sectsz=512 sunit=0 blks, lazy-count=1
> realtime =none extsz=4096 blocks=0, rtextents=0

That looks like a newly made 20GB XFS filesystem, not the result of
repairing a 350GB filesystem...

If I were you, I'd be restoring from backups. You do have backups,
right?

Cheers,

Dave.
--
Dave Chinner
david@fromorbit.com