Quoting Amos Shapira, from the post of Wed, 21 May: > > > LVM2 snapshots and a wrapper script? > > > We use LVM2 snapshots for quick xen guest rebuilds (snapshot a base image, > run automatic script to tweak for particular host instance). Works well for > a few months now.
problem is that the CAD tools running here dictate that we stick to RHEL4 (damn you, Cadence! how hard is it to support RHEL5?!), and snapshots are problematic at 2.6.9 (some problems were solved only at 2.6.16) > > The more I read about ZumaStor I like it more, but the big boon in LVM2 > > is that I don't have to recompile RHEL's kernel. so any production-env > > experiance shared will be appreciated. > > That's a big advantage if you ask me. > What's a killer argument against LVM2? instability in the old kernels, multiple snapshots mean multiple COWs (which zumastor is built to solve). people here wanted hourly0,1,2 and daily0,1,2 AND weekly0,1,2. that means 9 growing snapshots at any given moment, and that is one very serious disk handicap. snapshots in LVM2 are not really designed for that, they were mainly meant to be for hot backups of file systems, so you can freeze the FS just long enough to snap the state to a tarball and remove the snapshot. -- Your psychic friend Ira Abramov http://ira.abramov.org/email/ ================================================================= To unsubscribe, send mail to [EMAIL PROTECTED] with the word "unsubscribe" in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
