Volume Group Name Standards
This document describes the standards for assigning AIX Volume
Group (VG) names. A single standard has been developed for use in
standalone, High Availability, and Disaster Recovery environments. This
VG naming standard provides the mechanism to assign enterprise wide
unique names to all AIX VG's and will eliminate naming conflicts in the
event of a manual or automated failover, or if multiple instances of an
application are running on a single server.
To assign enterprise wide unique VG names, the system administrator
must first define the resource groups
names. Once the resource group names have been defined, then a VG
name may be defined based on the resource group name.
A single system may contain multiple resource groups, and typically
there will be one VG defined per resource group. However, a resource
group may contain several VG's, depending upon the requirements of the
application.
To define a VG name, obtain the 8 character
resource group name, then add a 2 digit volume group sequence number
that will uniquely identify the VG, followed by the characters "vg".
The VG name will always end with the characters "vg".
The VG name shall consist of exactly 12 characters
with the following structure:
ApplicationCode + Environment + Function + Company + Sequence ID + VG Sequence ID + "vg"
3 char + 1 char + 1 char + 2 char + 1 char + 2 char + 2 char
As an example, a resource group named "egaapmx0", may have multiple
associated VG's:
RG Name
Component
|
VG Sequence
Identifier
|
LV Identifier
|
VG Name
|
|
egaapmx0
|
00
|
vg
|
egaapmx000vg
|
|
egaapmx0
|
01
|
vg
|
egaapmx001vg
|
|
egaapmx0
|
02
|
vg
|
egaapmx002vg
|
Each VG also requires a system or cluster wide unique Major Number.
A unique major number can be generated using the following
algorithm:
MajorNbr=$( print "${VGNAME}" | sum -o | awk '{ print $1 }' )
To reiterate, before creating a VG, first establish an enterprise
wide unique resource group name, a VG name,
and a major number. Then create the VG.
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