There are several possibilities depending upon what you mean.

Personally, I have a zpool on the host that I carve off individual zfs filesystems that each guest uses. I put one qcow2 or raw image per zfs filesystem. I do this for backup and replication purposes. Then I have a recursive replication from this host to another so that I can boot up any of the VMs should the primary VM server goes down. Works great.

So, you can share the host zfs with the guest as the file/path for its virtual root

but you can also share it as just another directory device

or you could share it via NFS

or, if you wanted to (but I'm not sure why you would necessarily), you could share it via ISCSI

Is it possible to share a ZFS zpool between the host and one or more QEMU/KVM clients?

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Doug Hughes Keystone NAP Fairless Hills, PA 1.844.KEYBLOCK (539.2562)