[openstack-dev] [nova] Do any hyperviors allow disk reduction as part of resize ?

Aryeh Friedman aryeh.friedman at gmail.com
Fri Jun 13 17:15:29 UTC 2014

Also ZFS needs to know what is on the guest for example bhyve (the only
working hv for bsd currency [vbox kind of also works]) stores the backing
store (unless bare metal) as single block file.   It is impossible to make
that non-opaque to the outside world unless you can run commands on the

On Fri, Jun 13, 2014 at 11:53 AM, Darren J Moffat <Darren.Moffat at oracle.com>

> On 06/13/14 16:37, Daniel P. Berrange wrote:
>> The xenapi implementation only works on ext[234] filesystems. That rules
>>> >out *BSD, Windows and Linux distributions that don't use ext[234]. RHEL7
>>> >defaults to XFS for instance.
>> Presumably it'll have a hard time if the guest uses LVM for its image
>> or does luks encryption, or anything else that's more complex than just
>> a plain FS in a partition.
> For example ZFS, which doesn't currently support device removal (except
> for mirror detach) or device size shrink (but does support device grow).
>  ZFS does support file system resize but file systems are "just" logical
> things within a storage pool (made up of 1 or more devices) so that has
> nothing to do with the block device size.
> --
> Darren J Moffat
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Aryeh M. Friedman, Lead Developer, http://www.PetiteCloud.org
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