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Re: [linux-lvm] has anyone used LVM in a HA cluster?

-- Austin Gonyou <austin coremetrics com>

From what I understand you *can* mount the LVM volumes on multiple hosts

at the same time, but you should be *readonly* on the hosts which do not
*own* the data on the disks. You could then *remount* the volume on the
target failover host.

I've had reasonable luck with this approach on other platforms (HP-UX, but the LVM is similar enough that it should work).

All it really needs is a "heartbeatd": you open a
socket to, say, echo (port 1) and every second write
a byte. If you don't get the byte back in, say, 100ms
then you try one more time before re-mounting the LV
rw on the backup host.

This can all be done w/ sockets in perl with about
20 lines of code. If both hosts monitor each other
then either monitor can scream for help.

-- Steven Lembark 2930 W. Palmer Workhorse Computing Chicago, IL 60647 +1 800 762 1582

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