Using Serviceguard Extension for RAC, 6th Edition, April 2008

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.
Creating Physical Volumes
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
Creating a Volume Group with PVG-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, set up the group directory for vgops:
# mkdir /dev/vg_ops
2. Next, create a control file named group in the directory /dev/vg_ops, as follows:
# mknod /dev/vg_ops/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 the next
hexadecimal number that is available on your system, after the volume groups
that are already configured. 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:
# vgcreate -g bus0 /dev/vg_ops /dev/dsk/c1t2d0
# vgextend -g bus1 /dev/vg_ops /dev/dsk/c0t2d0
The first command creates the volume group and adds a physical volume to it in
a physical volume group called bus0. The second command adds the second drive
to the volume group, locating it in a different physical volume group named bus1.
The use of physical volume groups allows the use of PVG-strict mirroring of disks
and PV links.
4. Repeat this procedure for additional volume groups.
Creating a Storage Infrastructure with LVM 101