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Re: [Xen-devel] starting domain when block device already mounted



Are you mounting the device within dom0 after creating the domU? I'm not sure there's anything Xend can do about that.

Regards,

James Harper wrote:

My disks line is:

disk = [ 'phy:vg00/mail,0301,w', 'phy:vg00/mail-swap,0302,w' ]

The unpriv domain is up and running again, although I don't know what
damage has been done. /etc/passwd was missing though which is not a good
sign. I found it in /lost+found, but who knows what else is missing!

Thanks

James

-----Original Message-----
From: Ian Pratt [mailto:m+Ian.Pratt@xxxxxxxxxxxx]
Sent: Monday, 17 January 2005 09:34
To: James Harper; xen-devel@xxxxxxxxxxxxxxxxxxxxx
Subject: RE: [Xen-devel] starting domain when block device already
mounted
I just had a filesystem hosed in an unpriv domain (ext3
errors all over
the place), and then when I went to do a fsck on the block device it
told me it was already mounted, and sure enough, dom0 already had
the
device mounted. Would that cause a filesystem crash, or at
least errors?
Dom0 wasn't doing anything to the filesystem, and the unpriv
domain had
been up for a few weeks before this occurred.
Mounting an ext3 file system writeable in two domains is almost
certain
to destroy it.

The tools try and prevent this. Was it a 'file:' vbd? There's
currently
no safety checks for those, but there should be for physical partition
and LVM volumes.

Ian

Anyway, I've done this a few times before by mistake - made a few
changes to the unpriv domain's filesystem from dom0 and forgot to
unmount it before starting the domain. Is there any easy way
to get 'xm
create' to check before starting that none of the block devices it
is
about to export are in use? Such a thing would probably save me
countless headaches in the future! (or maybe it's been done
already? I'm
running 2.0.1)

Thanks

James


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