[linux-lvm] Moving Xen LV to image and mounting the image.

Chris Edwards cedwards at smartechcorp.net
Fri Nov 14 16:02:49 UTC 2008

>> sfdisk: ERROR: sector 0 does not have an msdos signature
>> /dev/loop5: unrecognized partition table type

>Why run sfdisk?

Just trying to see the partitions incase I have to mount with an offset.

>> mount -o loop wdcdns1.img /mnt/tmp/

>Why are you using '-o loop'.  You already have the loop device setup.   
>Couldn't you just:
>prompt> mount /dev/loop5 /mnt/tmp
>... or, if you didn't create the loop device already
>prompt> mount -o loop /root/wdcdns1.img /mnt/tmp

>> mount: you must specify the filesystem type
>> ---
>> mount -t xfs -o loop,ro,noatime,nodev,nofsck ~/wdcdns1.img /mnt/tmp/
>> mount: unknown filesystem type 'xfs'

>Is the xfs module loaded?  (do you have xfs support?)

I installed the xfs module with yum and then deleted all the loopback devices with losetup -d and started over again...

[root at wdcxen1 ~]# losetup -a
[root at wdcxen1 ~]# losetup /dev/loop0 /root/wdcdns1.img
[root at wdcxen1 ~]# losetup -a
/dev/loop0: [0807]:14876937 (/root/wdcdns1.img)
[root at wdcxen1 ~]# mount -t xfs -o loop,ro,noatime,nodev,nofsck ~/wdcdns1.img /mnt/tmp/
mount: wrong fs type, bad option, bad superblock on /dev/loop1,
       missing codepage or other error
       In some cases useful info is found in syslog - try
       dmesg | tail  or so

I really appreciate everyones help, this has been stumping me for a week or so.


Chris Edwards

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