Using Serviceguard Extension for RAC, 7th Edition, September 2008

Creating Disk Groups for RAC
Use the vxdg command to create disk groups. Use the -s option to specify shared mode, as in
the following example:
# vxdg -s init ops_dg c0t3d2
Verify the configuration with the following command:
# vxdg list
NAME STATE ID
rootdg enabled 971995699.1025.node1
ops_dg enabled,shared 972078742.1084.node2
Creating Volumes
Use the vxassist command to create logical volumes. For example:
# vxassist -g log_files make ops_dg 1024m
This command creates a 1024 MB volume named log_files in a disk group named ops_dg.
The volume can be referenced with the block device file /dev/vx/dsk/ops_dg/log_files
or the raw (character) device file /dev/vx/rdsk/ops_dg/log_files.
Verify the configuration with the following command:
# vxdg list
IMPORTANT: After creating these files, use the vxedit command to change the ownership of
the raw volume files to oracle and the group membership to dba, and to change the permissions
to 660. Example:
# cd /dev/vx/rdsk/ops_dg
# vxedit -g ops_dg set user=oracle *
# vxedit -g ops_dg set group=dba *
# vxedit -g ops_dg set mode=660 *
The logical volumes are now available on the primary node, and the raw logical volume names
can now be used by the Oracle DBA.
Mirror Detachment Policies with CVM
The required CVM disk mirror detachment policy is ‘global’, which means that as soon as one
node cannot see a specific mirror copy (plex), all nodes cannot see it as well. The alternate policy
is ‘local’, which means that if one node cannot see a specific mirror copy, then CVM will deactivate
access to the volume for that node only.
This policy can be re-set on a disk group basis by using the vxedit command, as follows:
# vxedit set diskdetpolicy=global <DiskGroupName>
NOTE: The specific commands for creating mirrored and multi-path storage using CVM are
described in the HP-UX documentation for the Veritas Volume Manager.
Oracle Demo Database Files
The following set of volumes is required for the Oracle demo database which you can create
during the installation process.
96 Serviceguard Configuration for Oracle 9i RAC