Managing Serviceguard Extension for SAP on Linux (IA64 Integrity and x86_64), April 2009

Two ABAP DI's, one ABAP SCS, one JAVA CI, one JAVA SCS, one JAVA REP, and
one DB
Compared to the previous example one JAVA enqueue replication server instance (JAVA REP) will be added.
The JAVA REP instance is identified by the name "ERS13. For this instance one new file system is required:
/usr/sap/C11/ERS13.
NOTE: In previous versions of SAP that the SAP instance number for SCS03 (03) has to be the same as
for the replication instance ERS03 (03). This has changed and any unique instance number can be chosen.
This example uses ERS13.
The mount points to be analyzed in a cluster environment are:
SAP Instance
/usr/sap/tmp/
/usr/sap/trans/
/usr/sap/C11/DVEBMGS00/
/usr/sap/C11/D01/
/usr/sap/C11/ASCS02/
/usr/sap/C11/SCS03/
/usr/sap/C11/JC04/
/usr/sap/C11/ERS13/ <--- new
/usr/sap/C11/SYS/exe/run
/sapmnt/C11/
/home/C11/adm
DB Instance
The file systems for the database have not changed so they are not listed.
Putting it all Together
Considering the above discussion the following file system layout was chosen:
Table 2-4 SAP CI Instance
TypePath
NFS/usr/sap/trans/
LOCAL/usr/sap/tmp/
EXCLUSIVE to this ABAP CI INSTANCE/usr/sap/<SID>/DVEBMGS00/
LOCAL/usr/sap/<SID>/SYS/
NFS/sapmnt/<SID>/
LOCAL/home/<SID>adm
Why SAP Provides sapcpe
Technically the file system /usr/sap/<SID>/SYS/exe/run could be configured as an NFS mounted file
system. The advantage of having configured this as a LOCAL mounted file system instead of NFS allows the
SAP binaries in this directory to still be available in the case of a network failure. On the other side even
with an LOCAL mount if there is a NFS failure there is a high probability other SAP components in the SAP
system depending on the network will also have failed. To circumvent the disadvantage of LOCAL mounted
file systems (overhead of cluster wide copy of file system contents to all cluster nodes) SAP is providing
"sapcpe" - a tool that automatically updates the contents of /usr/sap/<SID>/SYS/exe/run.
Putting it all Together 37