Re: [Xen-users] Bad experience in mounting a domU disk

[Andreï V. Fomitchev <fomitchev@xxxxxxxx>]

Hi, I am studying XEN for a project and I am trying to answer similar questions. Currently, I think NFS "partition" and/or libvirt based application.

Best regards,

--- En date de : Mer 4.6.08, Alain Barthe <ab266061@xxxxxxxxx> a Ãcrit :

De: Alain Barthe <ab266061@xxxxxxxxx>
Objet: Re: [Xen-users] Bad experience in mounting a domU disk
Ã: xen-users@xxxxxxxxxxxxxxxxxxx
Date: Mercredi 4 Juin 2008, 17h47

2008/6/4 RafaÅ Kupka <rkupka+Listy.Xen@xxxxxxxxxxxxx>:

On Wed, Jun 04, 2008 at 11:00:43AM +0200, Alain Barthe wrote:

Many journalled filesystems do replay journal even if mounted with 'ro'
option. XFS has norecovery option to truly read-only disk access.
Similar option has been recently added to ext3.

I think that the best approach is to take LVM snapshot of domU
filesystem and then mount (with journal replayed) that snapshot.

Thanks Rafal and Javier for your explanation, I begin to understand what happened.

The ext3 fs has the option "noload" to disable the load of the journal. I looked for something like "nocache" to disable the cache, but it appears not to exist.

My goal in mounting the filesystem of a alive domU is to monitor it (content of key files, free space, etc) in a non intrusive manner. Dealing with LVM snapshot is not obvious as we have no place enough for that.

Does somebody have a similar need ?

Thanks again.

Alain.

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