Managing Serviceguard Extension for SAP, December 2007

SAP Supply Chain Management
Planning the Volume Manager Setup
Chapter 4 207
Planning the Volume Manager Setup
In the following, the lc package of SGeSAP gets described. The lc package
was developed according to the SAP recommendations and fulfills all
SAP requirements for liveCache failover solutions.
liveCache distinguishes an instance dependant path /sapdb/<LCSID>
and two instance independent paths IndepData and IndepPrograms. By
default all three point to a directory below /sapdb.
NOTE <LCSID> denotes the three-letter database name of the liveCache
instance in uppercase. <lcsid> is the same name in lowercase.
There are different configuration options for the storage layout and the
filesystems caused by a trade-off between simplicity and flexibility. The
options are described below ordered by increasing complexity. The
cluster layout constraints that need to be fulfilled to allow the
simplifications of a given option are stated within a bullet list.
The subsequent sections refer to the options by the numbers that are
introduced here.
Option 1: Simple Clusters with Separated Packages
Cluster Layout Constraints:
• The liveCache package does not share a failover node with the APO
Central Instance package.
• There is no SAPDB or additional liveCache running on cluster nodes.
• There is no intention to install additional APO Application Servers
within the cluster.
• There is no hot standby liveCache system configured.