Re: [Xen-users] Using lvm for domUs

["Tijl Van den Broeck" <subspawn@xxxxxxxxx>]

> That said, I'd love to be able to have the DomUs detect partition size
> changes without reboots of the DomU
We do use LVM inside domU's for that, the SAN provides fixed size
LUN's, which is transparantly mapped through into the domU using
domU-name as prefix for the groups. It does have some minor annoyances
when performing live migration (ie. your source & target dom0 must be
-aware- of the LVM, so don't forget the rescan for LVM groups). Other
than that, I don't see why not recommending it, as long as your dom0
does not use the LVM, there are no issues with it... and you enable
hot disk space adding :-)



>  or even nicer -- have the LVM
> handling be passed through to Dom0 directly instead of handled as
> emulated partitions.  That is to say, /dev/DomU_VG/logs could be
> configured to pass through to Dom0's /dev/main/xen_DomU_logs directly
> ... but I've never played with the LVM internals so I'm not sure how
> likely that is to ever happen.
You're referring to internal "sharing" of an LVM from a dom0 towards a
domU with all its options, right? That's an interesting concept. I
wonder how it would handle on security levels though, I think you'd
have to go beyond the mere "passing-through" of block devices,
possibly mixing things making it too complex to handle.

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