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

[Chris Edwards]

Ok, forgive me I am fairly new to LV's, it was part of the RHCE test but I have never really had to use them until I started using a SAN and Xen.

No more losetup! 

[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/loop0,
       missing codepage or other error
       In some cases useful info is found in syslog - try
       dmesg | tail  or so


tail /var/log/messages

Nov 14 10:44:50 wdcxen1 kernel: XFS: unknown mount option [nofsck].

[root at wdcxen1 ~]# modprobe -l | grep xfs
/lib/modules/2.6.18-92.1.13.el5xen/kernel/fs/freevxfs/freevxfs.ko
/lib/modules/2.6.18-92.1.13.el5xen/extra/xfs/xfs.ko

---

Chris Edwards


> -----Original Message-----
> From: linux-lvm-bounces at redhat.com [mailto:linux-lvm-
> bounces at redhat.com] On Behalf Of Jonathan Brassow
> Sent: Friday, November 14, 2008 11:37 AM
> To: LVM general discussion and development
> Subject: Re: [linux-lvm] Moving Xen LV to image and mounting the image.
> 
> 
> On Nov 14, 2008, at 10:02 AM, Chris Edwards wrote:
> 
> >  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/
> 
> Stop doing that!  :)  When you run 'mount' with '-o loop' it sets up
> the loop device for you.  There is no reason to create the loop device
> ahead of time.
> 
> > 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
> 
> Did you try checking syslog?
> 
> Also, if you are trying to mount the original device and the loop back
> device at the same time, xfs will complain about conflicting UUIDs.
> If that's what syslog says is going on, and you really want to mount
> the same file system (one from the original device and one from the
> loopback), then you will need to use the mount option 'nouuid'.
> 
>   brassow
> 
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