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xen-users
Re: [Xen-users] restoring files to guest domains
Jared wrote:
From what I've read of LVM, v2 includes read/write support. So, I'd
think that I could do the following and it'd just work:
lvcreate -L 50G -s -n guest-backup /dev/vg1/guest-disk
mount -t ext3 -o rw /dev/vg1/guest-backup /mnt/snapshot
cp /mnt/backup/guest/etc/fstab /mnt/snapshot/etc/fstab.restore
umount /mnt/snapshot/
lvremove -f /dev/vg1/guest-backup
Dude, it doesn't work that way.
The way I see it, you're writing data to /dev/vg1/guest-backup, but then
you REMOVE the LV afterwards. And you expect it to show up on
/dev/vg1/guest-disk?
Like I said, I must either be really dense or I'm just
misunderstanding the meaning of "read/write" here, because the file is
certainly not being written as I'd expect.
The "read/write" part means you (should) be able to create a snapshot of
an LV, and write new data to that snapshot. The data will then be
available ONLY to the snapshot, not to the original LV.
To accomplish what you're looking for, you must copy the file using
either scp (or some other network-file-transfer), or shutdown the guest
and mount the LV on dom0.
This is different from (lets say) Solaris Zones, where a non-global zone
filesystem is visible from the global zone. In this case you can write
files from the global zone and have the non-global zone see the new
data. I believe it's not recommended to do so, but it works, since both
global and none global zone can have simultaneous access to the same
filesystem. It won't work with Xen.
If you absolutely must have the "feature" above, you might want to look
at solaris and brandZ zones. Basically it allows you to run some linux
distros on top of solaris kernel, giving global zone and brandZ zone
access to the same filesystem.
Regards,
Fajar
smime.p7s
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