[linux-lvm] LVM high availability

[matthew patton]

if you turn off caching in lvm.conf then you don't have to explicitly call vgscan or lvscan since it will happen automatically. However, any operation that changes LV or VG metadata must be single-entry. That's what XenServer does, they elect a "LVM master" and only that host is allowed to issue VG/LV commands. I believe it's worthwhile to get the full cluster stack running on your storage nodes, but you can probably use something far lighter like CARP/VRRP and get away with it.