Managing Serviceguard Fifteenth Edition, reprinted May 2008

Building an HA Cluster Configuration
Preparing Your Systems
Chapter 5 217
In the following examples, we use /dev/rdsk/c1t2d0 and
/dev/rdsk/c0t2d0, which happen to be the device names for the same
disks on both ftsys9 and ftsys10. In the event that the device file
names are different on the different nodes, make a careful note of the
correspondences.
NOTE Under agile addressing, the physical devices in these examples would
have names such as /dev/rdisk/disk1 and /dev/rdisk/disk2. See
“About Device File Names (Device Special Files)” on page 112.
On the configuration node (ftsys9), use the pvcreate command to
define disks as physical volumes. This only needs to be done on the
configuration node. Use the following commands to create two physical
volumes for the sample configuration:
pvcreate -f /dev/rdsk/c1t2d0
pvcreate -f /dev/rdsk/c0t2d0
Using PV Strict Mirroring Use the following steps to build a volume
group on the configuration node (ftsys9). Later, the same volume group
will be created on other nodes.
1. First, create the group directory; for example, vgdatabase:
mkdir /dev/vgdatabase
2. Next, create a control file named group in the directory
/dev/vgdatabase, as follows:
mknod /dev/vgdatabase/group c 64 0xhh0000
The major number is always 64, and the hexadecimal minor number
has the form
0xhh0000
where hh must be unique to the volume group you are creating. Use a
unique minor number that is available across all the nodes for the
mknod command above. (This will avoid further reconfiguration later,
when NFS-mounted logical volumes are created in the VG.)
Use the following command to display a list of existing volume
groups:
ls -l /dev/*/group