Red Hat ENTERPRISE LINUX 4 - LVM ADMINISTRATOR Przewodnik Instalacji Pobierz pdf (Strona 122)

Appendix C. LVM Object Tags

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For example, the following entry in the configuration file always defines tag1, and defines tag2 if the

hostname is host1.

tags { tag1 { } tag2 { host_list = ["host1"] } }

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.

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Red Hat ENTERPRISE LINUX 4 - LVM ADMINISTRATOR Przewodnik Instalacji Strona 122