Managing Serviceguard Extension for SAP, December 2007

Step-by-Step Cluster Conversion
HP-UX Configuration
Chapter 3114
Directory Structure Configuration
This section adds implementation practices to the architectural decisions
made in the chapter “Storage Layout Considerations”. If layout option 1
or option 2 is used, then the non-CFS directory structure conversion
must be performed. An implementation based on HP LVM is described in
this document. VxVM can similarly be used. Option 3 maps to the CFS
configuration for SAP. In this case, usage of VxVM and CVM are
mandatory.
Cluster Filesystem Configuration
Logon as root to the system where the SAP Central Instance is installed.
If the database is installed on a different host, also open a shell as root on
the database machine. Make sure that all SAP instances and the
database got stopped manually.
NOTE These steps are only required if HP Serviceguard Cluster File System is
going to be used for the SAP instances.
IS009 Installation Step:
Verify that the existing disk group layout is compliant with the needs of
the Serviceguard package(s) as specified in the tables for option 3 of
Chapter 2. All directories that are labeled shared in these tables need to
reside on logical volumes on a shared external storage system. The
volume management needs to be VxVM based. The volumes can be
converted using vxvmconvert(1m), if the SAP System got originally
installed on HP LVM volumes instead.
All SAP Instances (CI, SCS, ASCS, D,…) must have instance numbers
that are unique for the whole cluster. Exceptions are (A)REP instances
that follow an old naming convention of sharing the instance ID with
their corresponding (A)SCS instance. This naming convention should no
longer be used, since it cannot be combined with the SAP startup
framework. For a clustered instance with instance number <INSTNR>
execute the command:
ls -d /usr/sap/???/*<INSTNR>
It should not reply any match on any node. Otherwise refer to the SAP
documentation how to change instance IDs for the relevant instance
type. It might be simpler to reinstall one of the conflicting instances.