Managing Serviceguard 12th Edition, March 2006

Building an HA Cluster Configuration
Creating the Storage Infrastructure and Filesystems with LVM and VxVM
Chapter 5 211
Selecting Disks for the Volume Group 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/dsk/*
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 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 0x hh 0000
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
3. Create the volume group and add physical volumes to it with the following
commands:
# vgcreate -g bus0 /dev/vgdatabase /dev/dsk/c1t2d0
# vgextend -g bus1 /dev/vgdatabase /dev/dsk/c0t2d0