Installation guide

6.1.2 SAP Virtual IP Addresses
SAP NetWeaver is typically installed via the graphical installation tool sapinst. Before
beginning the installation, determine which IP addresses and host names are preferred for
use during the SAP installation. First, each node requires a static IP address and an
associated host name. This address is also referred to as the physical IP address . Second,
each database and SAP instance will require a virtual IP address / host name. The virtual
addresses must not be configured at the operating system level because they are under the
control of RHCS. Those addresses are referred to as the virtual IP addresses.
Local dialog instances, which are not part of the cluster, use a virtual host name as an alias to
the physical host name so those SAP instances are not failed over by RHCS.
The enqueue replication instances do not need IP addresses because no connections are
established with them. The virtual host name is only used to start the instances manually via
the sapstart command and to distinguish their profile names from physical host names.
Edit the /etc/hosts file on all nodes and add the virtual host names and their associated IP
addresses. Additionally, add any other cluster relevant host name and address (e.g., the
physical host names or addresses of the nodes) to /etc/hosts so the DNS server is no longer
a possible single point of failure.
6.1.3 SAP File Systems
The file systems for our scenario must be prepared before installing SAP NetWeaver.
File systems must be set up locally, on shared storage with local file system type (e.g., Ext3),
and on a highly available NFS server.
6.1.3.1 Local File Systems
Directories such as /usr/sap and /sapmnt can be created locally.
Specific directories for SAP agents such as /usr/sap/ccms, /usr/sap/<SID>/ccms or
/usr/sap/SMD must be configured according to your SAP landscape.
The linking directory /usr/sap/<SID>/SYS can reside locally because it contains only links to /
sapmnt/<SID>.
The directory /usr/sap/tmp should also be locally.
6.1.3.2 Shared Storage File Systems
The instance directories /usr/sap/<SID>/<InstanceNo> must be set up on a shared storage,
so that these directories are able to perform a switchover triggered by the cluster software.
The database directories must be set up according to the SAP installation guide.
MaxDB
Create /sapdb/programs/lib and /sapdb/programs/runtime locally on every node. See the
post-processing section how to copy the files after the installation.
30 | www.redhat.com