Re: ext2fs stability (in vm?)

[Alexey Shvetsov]

Well i tryed this. but seems it may be related to kvm.

PS there is simple way to look at disk images content
# losetup /dev/loop0 /var/xen/hurd.img
# kpartx -a -v -s /dev/loop0
so we will have partitions in /dev/mapper/loop0pN. kpartx is part of 
multipath-tools

On Wed, 06 Apr 2011 17:09:20 -0400, Andrew Engelbrecht wrote:
> Have you tried running fsck on the disk image? It won't solve any 
> ext2fs
> server instability, but it should give you another shot at starting 
> up.
> The only trick is doing it outside of qemu, since your system isn't
> booting up. Also, it's somewhat more complicated because it has 
> multiple
> partitions.
>
> Here's what worked for me, using hd0.img:
>
> #  stop any loop device usage:
> losetup -d /dev/loop*
> #  again for good measure:
> losetup -d /dev/loop*
>
> rmmod loop
> modprobe loop max_part=63
> #  ^ now when we add a loop device, it will list multiple
> #  partitions with a pN suffix, where N = 1-63
> losetup -f hd0.img
>
> ls /dev/loop0*
> #  that will print the partitions. my output was:
> #  /dev/loop0  /dev/loop0p1  /dev/loop0p2  /dev/loop0p5
>
> parted /dev/loop0 p
> #  print partition info. for me, the ext2 partition was number 1.
>
> sudo fsck /dev/loop0p1
> #  that runs fsck on partition 1. you may need to use some options,
> #  check "man fsck" for more info. also it may be necessary to run
> #  again if there are errors.
>
> #  stop the loop device usage:
> losetup -d /dev/loop*
> #  again, since we have both loop0 and loop0pN:
> losetup -d /dev/loop*
>
> #  that's it! try not to kill qemu too much. you can use the halt
> #  command to stop hurd before you kill qemu (at least with Debian.)
>
> source: one of the comments in:
>
> http://www.docunext.com/blog/2007/07/losetup-working-with-raw-disk-images.html
>
> Hope it helps.
>
> -Andrew

--
Best Regards,
Alexey 'Alexxy' Shvetsov
Petersburg Nuclear Physics Institute, Russia
Department of Molecular and Radiation Biophysics
Gentoo Team Ru
Gentoo Linux Dev
mailto:alexxyum@gmail.com
mailto:alexxy@gentoo.org
mailto:alexxy@omrb.pnpi.spb.ru