RE: [Xen-users] Howto access the guest filesystem under LVM ?

["Artur Linhart - Linux communication" <AL.LINUX@xxxxxxxxxxx>]

Hello,

 

            Do Zou need a read-only or read-write access? If read-only is enough, then You could create the snapshot of the logical volume with lvcreate and read from it...

 

                        With regards    

 

                                   Artur

 

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From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Pascal
Sent: Sunday, June 17, 2007 11:15 PM
To: Marcin Owsiany; xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] Howto access the guest filesystem under LVM ?

 

Marcin Owsiany a écrit :

On Sun, Jun 17, 2007 at 09:04:09PM +0200, Pascal wrote:

I have created a guest using virt-install.

On the dom0 we have created a LogicalVolume and used it to install the 

guest

We need to copy all the contents of the guest, so we'd like to access 

the guest filesystem from dom0

Tried something like :

mount -o loop /dev/xenvps/mylv /mnt

But it doesn't work

Omit "-o loop". /dev/xenvps/mylv is a (symlink-to) a real block device

file, so there's no need for loop.

Keep in mind that having it mounted R/W in guest and R/W or R/O in dom0

at the same time is asking for trouble.

It doesn't work

# mount /dev/mapper/xenvps-centos45 /mnt/

mount: you must specify the filesystem type

Ah, I think with newer centos/RH you need to treat the volume as a whole

disk and perform some tricks to make linux see partitions inside it, and

potentially even use them as LVM volumes.. I think there were examples

of that on the list earlier, I don't remember the details, though.

Well I didn't find anything about this in the xen doc and google didn't give me something :\
Hope somebody knows how to mount a guest filesytem created under an LVM partition

Pascal


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