Managing Serviceguard 14th Edition, June 2007

Building an HA Cluster Configuration
Preparing Your Systems
Chapter 5224
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
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
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.
4. Repeat this procedure for additional volume groups.
Creating Logical Volumes Use the following command to create
logical volumes (the example is for /dev/vgdatabase):
lvcreate -L 120 -m 1 -s g /dev/vgdatabase
This command creates a 120 MB mirrored volume named lvol1. The
name is supplied by default, since no name is specified in the command.
The -s g option means that mirroring is PVG-strict, that is, the mirror
copies of data will be in different physical volume groups.
NOTE If you are using disk arrays in RAID 1 or RAID 5 mode, omit the -m 1
and -s g options.