Managing Serviceguard 14th Edition, June 2007

Configuring Packages and Their Services

How Control Scripts Manage VxVM Disk Groups

Chapter 6 311

How Control Scripts Manage VxVM Disk

Groups

VxVM disk groups (other than those managed by CVM, on systems that

support it) are outside the control of the Serviceguard cluster. The

package control script uses standard VxVM commands to import and

deport these disk groups. (For details on importing and deporting disk

groups, refer to the discussion of the import and deport options in the

vxdg man page.)

The control script imports disk groups using the vxdg command with the

-tfC options. The -t option specifies that the disk is imported with the

noautoimport flag, which means that the disk will not be automatically

re-imported at boot time. Since disk groups included in the package

control script are only imported by Serviceguard packages, they should

not be auto-imported.

The -f option allows the disk group to be imported even if one or more

disks (a mirror, for example) is not currently available. The -C option

clears any existing host ID that might be written on the disk from a prior

activation by another node in the cluster. If the disk had been in use on

another node which has gone down with a TOC, then its host ID may still

be written on the disk, and this needs to be cleared so the new node’s ID

can be written to the disk. Note that the disk groups are not imported

clearing the host ID if the host ID is set and matches a node that is not in

a failed state. This is to prevent accidental importation of a disk group on

multiple nodes which could result in data corruption.

CAUTION Although Serviceguard uses the -C option within the package control

script framework, this option should not normally be used from the

command line. Chapter 8, “Troubleshooting Your Cluster,” on page 385,

shows some situations where you might need to use -C from the

command line.

The following example shows the command with the same options that

are used by the control script:

# vxdg -tfC import dg_01