On Tue, Jul 25, 2006 at 11:02:14PM -0700, Andrew wrote: > Since ZFS is COW, can I have a read-only pool (on a central file > server, or on a DVD, etc) with a separate block-differential pool on > my local hard disk to store writes? > > This way, the pool in use can be read-write, even if the main pool > itself is read-only, without having to make a full local copy of that > read-only pool in order to be able to write to it, and without having > to use messy filesystem-level union filesystem features.
These are some interesting use cases. I'll have to ponder how they could be best implemented in ZFS. Some of these cases can be solved simply by having a read-only device in the pool (eg. live-boot DVDs). However, cases where you want to transfer the data between devices are somewhat nontrivial (eg. hard drive + flash memory), at least until we have 4852783 "reduce pool capacity". I've filed RFE 6453741 "want mostly-read-only devices" to remember this request. --matt _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
