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xen-users
[Xen-users] Backing up Xen DomU's - Tape Drive - LVM
Hi,
I am planning the roll out of a Xen dom0 running CentOS that is going
to be running two DomU's CentOS and Windows 2003 SBS. I am planning on
using LVM for the disks as this (so i have read) increases i/o
performance compared to image files.
I need a solution to back up these machines and I have came up with the
following two ideas:
Idea 1,
Backup the machines as images (lvm snapshot?) and backup to a tape
drive. However the 2003 SBS server will be running Exchange server and
backing up the image while it runs is obviously not going to be
possible as the databases will be in an open state? So I am wondering
if pausing the DomU's and then backing them up to disk would work?
(using xm pause). However what if the database was being written to at
that some of the data could still be in memory? I would need to make a
true snapshot of the whole disk including what is in memory to make
this work? Is this possible are any of you guy doing this? Another
idea could be to make a script to unmount all the database and schedule
the backup to run at the time the db's have stopped.
Idea 2,
Back up traditionally using a scsi tape drive. I am wondering if i
attached the SCSI tape drive to the Dom0 would the DomU's be able to
access the drive? I would obviously have to schedule the backups at
different times otherwise the tape drive would be in use by the other
DomU, if one DomU is using the tape drive would the other DomU's get
some sort of busy signal if they attempted to use it?
Note, the server is only mainly going to be used during business hours
some evening work etc, but no one is ever going to be using the server
at like 3AM so pausing the DomU's at that time should not cause a
problem.
Any ideas? Does anyone else have any suggestions / solutions I have not
thought about?
Many Thanks
Keith
--
Keith
Sudbury
Netzen Solutions Ltd
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