Managing Serviceguard Extension for SAP, December 2007

Planning the Storage Layout
Chapter 2 49
2 Planning the Storage Layout
Volume managers are tools that let you create units of disk storage
known as storage groups. Storage groups contain logical volumes for use
on single systems and in high availability clusters. In Serviceguard
clusters, package control scripts activate storage groups. Two volume
managers can be used with Serviceguard: the standard Logical Volume
Manager (LVM) of HP-UX and the Veritas Volume Manager (VxVM).
SGeSAP can be used with both volume managers. The following steps
describe two standard setups for the LVM volume manager. VxVM
setups can be configured accordingly. A third storage layout option
describes a Cluster File System configuration for SGeSAP.In this case,
VxVM must be used and all Application Servers need to run on cluster
nodes. Chapter three explores the concepts and details the
implementation steps discussed in this chapter.
Database storage layouts for usage with parallel databases are only
briefly described for Oracle Real Application Clusters. Detailed
configuration steps for parallel database technologies are not covered in
this manual. Additional information about SGeSAP and parallel
databases is being released as whitepapers from HP. Refer to the
Additional Reading section of the relevant SGeSAP release notes to
verify the availability of whitepapers in this area.
This chapter discusses disk layout for clustered SAP components and
database components of several vendors on a conception level. It is
divided into two main sections:
• SAP Instance Storage Considerations
• Database Instance Storage Considerations