On Tue, 2007-11-20 at 09:29 -0800, malahal@us.ibm.com wrote: > S. J. van Harmelen [svh@dds.nl] wrote: > > > > Now my thoughts where to take snapshots on the storage server. So that > > would mean I would take a snapshot of lv_storage. This should not be a > > problem. But what if virtual machine 2 crashes and has to be restored? > > > > In that case I cannot restore lv_storage with a dd command, because then > > all the data will be restored (lv_virtualmachine1 and > > lv_virtualmachine2, because they are both on lv_storage). So is it > > possible to "restore" only lv_virtualmachine2 when I took a snapshot of > > lv_storage? > > I see, it is possible but a bit cumbersome. You should be able to run > LVM on the storage server on the restored/old data (LVM on top of LVM??) and > get the data for the lv_virtualmachine2 from the storage server to > XenSource (ftp/tar whatever method). Then, restore that data (tar > extract) at XenSource. > > If things are NOT changing at the XenSource LVM, you could just "dd" on > the crashed LV, but things may go really bad otherwise. > > Any better method(s)??? Would it also work when I create lv_storage, take a snapshot of it and then when I need to restore a virtual machine I tempararly export the snapshot true iSCSI to the Xen server. Then on the Xen server I should see the PV and LV's Xen created both on the real iSCSI exported disk, as the exported snapshot from the storage server. So then I should be able to do a dd from one lv to the other, right? > > > I can see the PV and LV's Xen created on lv_storage on the storage > > server when I run pvs by the way... > > Yes, you will see them but you want the storage server's LVM to NOT use > them under normal conditions. > > BTW, for backup, you may want snapshot-origin target rather than snapshot > target directly.. _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
