Using EMS HA Monitors

Chapter 2 45
Monitoring Disk Resources
Rules for Using the EMS Disk Monitor with MC/ServiceGuard
4. Use the following commands to create the volume group itself with the first link
assigned to a physical volume group called bus1and the second link assigned to
a physical volume group called bus2:
# vgcreate -g bus1 /dev/vgdatabase /dev/dsk/c0t15d0
# vgextend -g bus2 /dev/vgdatabase /dev/dsk/c0t3d0
LVM will now recognize the I/O channel represented by /dev/dsk/c0t15d0 as the
primary link to the disk; if the primary link fails, LVM will automatically switch to
the alternate I/O channel represented by /dev/dsk/c1t3d0.
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 option.