On Fri, 2004-11-19 at 12:19, Nils Juergens wrote: > On Fri, 19.11.04, Ming Zhang <mingz@ele.uri.edu> wrote: > > > instead of copy old one to snapshot, overwrite old one with new one, 2 > > writes and 1 reads. it is possible that write new data to a usused > > location directly. > > Since you have to delete the snapshot (and I don't think they live very long > on most systems) you don't gain anything (because you have copy the changes > back from the snapshot), but you make the cases of more than one snapshot > and (possibly) read-write snapshots a lot harder, maybe not in CPU or IO, > but certainly in code complexity, which is a thing you never do to gain > a bit of performance. > on some systems that mainly for disaster recovery purpose, there will be a lot of snapshots available for a lv. this can make the recovery much easier. > > i know later remove a snaphot will be a little trouble, but there must > > be some way to get around it. > > Yes, you have to do the work you saved a couple of minutes earlier :) > a dedicated snapshot merge process can solve this. > just my EUR 0.02, thanks. discussion always can make thing clarified. > Nils _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
