Managing Serviceguard Extension for SAP, December 2007

Planning the Storage Layout
SAP Instance Storage Considerations
Chapter 260
Directories that Reside on Shared Disks
Volume groups on a SAN shard storage get configured as part of the
SGeSAP package.
Instance specific volume groups are required by only one SAP instance or
one database instance. They usually get included with exactly the
package that is set up for this instance. In this configuration option the
instance specific volume groups are included in package.
System specific volume groups get accessed from all instances that
belong to a particular SAP System. Environment specific volume groups
get accessed from all instances that belong to any SAP System installed
in the whole SAP scenario. System and environment specific volume
groups should be set up using HA NFS to provide access capabilities to
SAP instances on nodes outside of the cluster. The cross-mounting
concept of option 1 is not required.
A valuable naming convention for most of these shared volume groups is
vg<component><SID> or alternatively vg<component><SID><INR>.
Table 2-4 provide an overview of SAP shared storage for this special
setup and maps them to the component and package type for which they
occur.