Managing Serviceguard Fifteenth Edition, reprinted May 2008

Configuring Packages and Their Services
How Control Scripts Manage VxVM Disk Groups
Chapter 6324
This command takes over ownership of all the disks in disk group dg_01,
even though the disk currently has a different host ID written on it. The
command writes the current node’s host ID on all disks in disk group
dg_01 and sets the noautoimport flag for the disks. This flag prevents a
disk group from being automatically re-imported by a node following a
reboot. If a node in the cluster fails, the host ID is still written on each
disk in the disk group. However, if the node is part of a Serviceguard
cluster then on reboot the host ID will be cleared by the owning node
from all disks which have the noautoimport flag set, even if the disk
group is not under Serviceguard control. This allows all cluster nodes,
which have access to the disk group, to be able to import the disks as part
of cluster operation.
The control script also uses the vxvol startall command to start up
the logical volumes in each disk group that is imported.