On Thu, Oct 18, 2007 at 06:58:38PM +0100, John Levon wrote: > > Accidentally deleted your reply Richard, sorry. > > ZFS 'pools' are aggregates composed of some number of real devices. LVM > confuses me so I don't know what they map on to, but the basic idea is > that you can carve filesystems out of such pools at will. That is the same concept as an LVM volume group. > You can also carve out 'volumes' - these appear as a disk device in > /dev/zvol/dsk/poolname/volumename That is the same concept as an LVM logical volume > It's the latter that you use in Xen to hold domU root filesystems (or > you can use a normal file on whatever file system, or a real device, as > desired). > > What might be tricky is anything that claims to return "space left", > depending exactly on what you want it to mean. But (I think) certain LVM > setups have similar issues. Asking 'space left' for a volume directly isn't really applicable - that's a property of the file system on the volume instead. 'Space left' in a pool is basically an indication of how much space is available for allocating additional pools. Allowing you ask 'is that space to allocate a 10 GB volume in this pool?' rather than just blindly trying & failing Dan. -- |=- Red Hat, Engineering, Emerging Technologies, Boston. +1 978 392 2496 -=| |=- Perl modules: http://search.cpan.org/~danberr/ -=| |=- Projects: http://freshmeat.net/~danielpb/ -=| |=- GnuPG: 7D3B9505 F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 -=| -- Libvir-list mailing list Libvir-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvir-list