-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Tomasz Chmielewski wrote: > Is LVM cluster-aware? Of course it's not, but... Will I loose data if I > have a LVM physical volume replicated on two machines with DRBD, and I > want to access two separate logical volumes on different machines? LVM2 supports clustering with several generations of Red Hat cluster (RHEL4 cman, RHEL5 openais with dlm or gulm locking) via the clvmd deamon. Once a volume group is marked as clustered & the infrastructure is set up, the tools automatically lock and unlock LVM resources across the cluster. This prevents a tool running on one node from interfering with another tool running at the same time on a different node. If you need it to work with another clustering environment you'll need to make code changes - see the code in daemons/clvmd/ for the existing cluster types. > I don't want to add/remove/rename/resize/etc. any volumes - just access > them on separate machines. As long as you never try to update the LVM metadata from two nodes at the same time (e.g. add/remove/rename/resize etc. running on two nodes simultaneously) then this is fine, but there is no automatic prevention of this situation. If/when you do need to make changes, you'll want to make sure the VG you are working with is only active on one node. See various threads on this mailing list & linux-cluster for further discussion of clvmd and using LVM in a clustered environment without it. Regards, Bryn. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (GNU/Linux) Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org iD8DBQFHmMsK6YSQoMYUY94RAiXoAJ9TAFF1QbQa6bK0aycb9udk5XvXiwCffQce T4mLoq+DEPWqOA2DODXVcuU= =VzSD -----END PGP SIGNATURE----- _______________________________________________ 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/
