[Xen-users] XFS, xfs_freeze, LVM and memory

[Wolfgang Hennerbichler <wogri@xxxxxxxxx>]

Hi XEN users,

First of all: this is not really a xen-question, more an LVM+XEN  
question.
I'm redesigning my vserver host (moving to xen), and right now I'm  
thinking about using XFS as the filesystem in the guests. I'm going  
to use lvm-snapshotting for backup, so I have to think about memory  
in Dom0. My backup strategy is as follows: xfs_freeze a domU,  
snapshot it, xfs_unfreeze it, back it up, remove the snapshot. My lvm- 
partitions vary in size, the biggest is about 20 gigabytes.
I have a couple of questions for those who use this combination:

* can I call xfs_freeze from dom0, or does it have to be domU that  
calls that command? (I guess so, as the domU kernel needs to freeze  
the FS, but probably I'm wrong) - this would imply that my domU needs  
to have the exact same timing with Dom0 (freeze inside domU, snapshot  
in dom0, unfreeeze in domU)...
* how much memory (I'm pretty low on memory) should I allocate for dom0?

Thanks for any thoughts,

wogri

--
wogri@xxxxxxxxx
http://www.wogri.com
http://www.einradfilm.at


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