I'm running libvirt to manage virtual machines utilizing ZFS zvol's for
storage. For organization and management purposes, these zvol's are nested:
virt/qemu/debian12-template 15.8G 1.57T 24K none
virt/qemu/debian12-template/bootefi 1.02G 1.57T 141M -
virt/qemu/debian12-template/home 522M 1.57T 2.57M -
virt/qemu/debian12-template/opt 522M 1.57T 3.00M -
virt/qemu/debian12-template/root 8.13G 1.58T 970M -
virt/qemu/debian12-template/swap 522M 1.57T 366M -
virt/qemu/debian12-template/tmp 522M 1.57T 2.39M -
virt/qemu/debian12-template/var 3.05G 1.57T 161M -
virt/qemu/debian12-template/varlog 1.02G 1.57T 101M -
virt/qemu/debian12-template/vartmp 522M 1.57T 3.75M -
The libvirt ZFS integration seems to assume that all zvol's will exist
at the top level of the pool, it won't let you create or manage a
hierarchical structure. That is what it is, but it also then
misrepresents the actual structure and shows things as being in the root
when they are not:
virsh # vol-list virt
Name Path
-------------------------------------
backup /dev/zvol/virt/backup
boot-nb /dev/zvol/virt/boot-nb
bootefi /dev/zvol/virt/bootefi
dest /dev/zvol/virt/dest
disk1 /dev/zvol/virt/disk1
home /dev/zvol/virt/home
opt /dev/zvol/virt/opt
root /dev/zvol/virt/root
swap /dev/zvol/virt/swap
tmp /dev/zvol/virt/tmp
usr /dev/zvol/virt/usr
usrlocal /dev/zvol/virt/usrlocal
usrobj /dev/zvol/virt/usrobj
usrports /dev/zvol/virt/usrports
usrsrc /dev/zvol/virt/usrsrc
var /dev/zvol/virt/var
varlog /dev/zvol/virt/varlog
vartmp /dev/zvol/virt/vartmp
Ideally libvirt would support nested ZFS organizational structure, as
that is a very common layout. But even if not, it probably shouldn't
misrepresent a structure it doesn't understand?
Thanks for any thoughts…
