Managing Serviceguard Sixteenth Edition, March 2009

If your volume groups have not been set up, use the procedures that follow. If you
have already done LVM configuration, skip ahead to the section “Configuring the
Cluster.”
Obtain a list of the disks on both nodes and identify which device files are used for the
same disk on both. Use the following command on each node to list available disks as
they are known to each system:
lssf /dev/d*/*
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)” (page 107).
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 volume group.)
Use the following command to display a list of existing volume groups:
ls -l /dev/*/group
3. Create the volume group and add physical volumes to it with the following
commands:
208 Building an HA Cluster Configuration