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 :|