On Wed, Oct 15, 2008 at 01:47:36PM -0700, Itamar Heim wrote: > The main issue is indeed across nodes. As you pointed out, fnctl() won't > solve the issue for iSCSI. > What about the leased lock mechanism, for example, with libvirt playing > an external watchdog and terminating the qemu process if it cannot renew > the lock, or a central (nfs? Central service) storage to maintain the > global locks. When you get to that level of cleverness, it seems to me that it is verging on a complete re-implementation of DLM (distributed lock manager), which really, AFAIK, needs a proper cluster setup so it can safely fence mis-behaving nodes, and avoid quorum/split-brain problems. Daniel -- |: Red Hat, Engineering, London -o- http://people.redhat.com/berrange/ :| |: http://libvirt.org -o- http://virt-manager.org -o- http://ovirt.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 :| -- Libvir-list mailing list Libvir-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvir-list