Red Hat CLUSTER SUITE 4.7 - CLUSTER LVM ADMINISTRATORS, Manual, Page: 98 / 108

Appendix C. LVM Object Tags
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C.3. Controlling Activation with Tags
You can specify in the configuration file that only certain logical volumes should be activated on that
host. For example, the following entry acts as a filter for activation requests (such as
vgchange -ay
)
and only activates
vg1/lvol0
and any logical volumes or volume groups with the
database
tag in
the metadata on that host.
activation { volume_list = ["vg1/lvol0", "@database" ] }
There is a special match "@*" that causes a match only if any metadata tag matches any host tag on
that machine.
As another example, consider a situation where every machine in the cluster has the following entry in
the configuration file:
tags { hosttags = 1 }
If you want to activate
vg1/lvol2
only on host
db2
, do the following:
1. Run
lvchange --addtag @db2 vg1/lvol2
from any host in the cluster.
2. Run
lvchange -ay vg1/lvol2
.
This solution involves storing hostnames inside the volume group metadata.