Managing HP Serviceguard for Linux, Sixth Edition, August 2006

Planning and Documenting an HA Cluster
Volume Manager Planning
Chapter 498
Volume Manager Planning
When designing your disk layout using LVM, you should consider the
following:
• The volume groups that contain high availability applications,
services, or data must be on a bus or buses available to the primary
node and all adoptive nodes.
• High availability applications, services, and data should be placed in
volume groups that are separate from non-high availability
applications, services, and data.
• You must group high availability applications, services, and data,
whose control needs to be transferred together, on a single volume
group or a series of volume groups.
• You must not group two different high availability applications,
services, or data, whose control needs to be transferred
independently, on the same volume group.
• Your root disk must not belong to a volume group that can be
activated on another node.
Volume Groups and Physical Volume Worksheet
You can organize and record your physical disk configuration by
identifying which physical disks, LUNs, or disk array groups will be used
in building each volume group for use with high availability applications.
Use the Volume Group and Physical Volume worksheet on page 329.
NOTE HP recommends that you use volume group names other than the
default volume group names (vg01, vg02, etc.). Choosing volume group
names that represent the high availability applications they are
associated with (e.g., /dev/vgdatabase) will simplify cluster
administration.