Install SAP Instances

Complete the following steps to install the ASCS10 and ERS20 instances on node-a and node-b.

Prepare for Installation

1. On node-a and node-b, increase the available swap space to greater than 1MiB to satisfy the SAP system requirements. In this example we will create a 1GiB swap file to increase the available swap space.

*Note: Production environments will likely require more available swap space. Consult SAP Note 1597355 (Swap space recommendation for Linux) for more details.

# mkdir /swap
# dd if=/dev/zero of=/swap/swapfile.img bs=1024 count=1M
# chmod 600 /swap/swapfile.img
# mkswap /swap/swapfile.img
# echo "/swap/swapfile.img    swap    swap    sw    0 0" >> /etc/fstab
# swapon /swap/swapfile.img

2. Ensure that the tcsh package is installed on both node-a and node-b. Modify this command (e.g., to use zypper install) if installing on a SLES server.

# yum install -y tcsh

3. On node-a and node-b, create a /sap-install directory which will contain the SAP installation files.

# mkdir /sap-install

*Note: If the root file system for your chosen instance type does not have sufficient disk space to store the required SAP installation files once they are extracted, you may attach a temporary disk to each instance and mount it at /sap-install in order to complete installation of the SAP software.

4. Download SAPCAR, SAP Software Provisioning Manager 2.0 (SWPM20SPxx_x-xxxx.SAR), and all necessary packages (e.g., SAPEXE_xx-xxxx.SAR, SAPHOSTAGENTxx_xx-xxxx.SAR, etc.) to the /sap-install directory on both nodes. Make sure that SAPCAR is executable.

# chmod +x /sap-install/SAPCAR

5. Use SAPCAR to extract the files for SWPM 2.0.

# cd /sap-install
# ./SAPCAR -xvf SWPM20SPxx_x-xxxx.SAR

Before installing the SAP instances, verify that all shared and replicated file systems described in the appropriate cloud-specific subsection of Create SAP File Systems are mounted correctly on node-a and/or node-b and that the LifeKeeper resources providing virtual hostname failover for the ASCS and ERS instances are in-service on node-a and node-b, respectively.

If deploying on AWS or Microsoft Azure, the LifeKeeper GUI should resemble the following image:

If deploying on Google Cloud, the LifeKeeper GUI should resemble the following image:

Install the ASCS Instance on Node-A

Complete the following steps to install the ASCS10 instance on node-a.

1. If installing from a remote system, add a firewall rule to allow inbound traffic on TCP port 4237 (the port which exposes the sapinst graphical interface) on node-a.

2. Execute the following command on node-a to initiate sapinst with the virtual hostname associated to the ASCS instance:

[root@node-a ~]# /sap-install/sapinst SAPINST_USE_HOSTNAME=sps-ascs

*Note: The virtual host name used as the value of the SAPINST_USE_HOSTNAME parameter must resolve to the ASCS instance virtual IP that was created and protected in the section of Create ASCS and ERS Virtual IPs that you followed.

*Note: The SAPINST_REMOTE_ACCESS_USER=<user> parameter may be used to allow login to the sapinst graphical interface by a non-root user.

*Note: If sapinst displays an error due to a missing dt_socket transport library, install the libnsl package with yum -y install libnsl.

3. To access the sapinst graphical interface, use a web browser to navigate to https://<node-a Public IP>:4237/sapinst/docs/index.html.

4. Select Software Provisioning Manager 2.0 SP XX → SAP S/4HANA Server 1909 → SAP HANA Database → Installation → Application Server ABAP → High-Availability System → ASCS Instance and click Next.

*Note: The screenshots shown in this guide are specific to Software Provisioning Manager 2.0 SP 04, and the interface may be different when using other versions of Software Provisioning Manager.

5. Provide the following parameters when installing the ASCS instance. The icon indicates that the default option is chosen.

Field	Value
SAP System ID (SAPSID)	SPS
SAP Mount Directory	/sapmnt
Password for All Users	<SAP User Password>
Password of SAP System Administrator	<SAP Admin Password>
User ID	Leave empty
Group ID of sapsys	Leave empty
Specify path to SAPEXE.SAR	/sap-install
Specify path to SAPHOSTAGENT.SAR	/sap-install
ASCS Instance Number	10
ASCS Instance Host Name	sps-ascs
ABAP Message Server Port	3610
Internal ABAP Message Server Port	3910
Yes, clean up operating system users	Click

6. Review the parameters and proceed with the installation.

*Note: If the installation fails due to insufficient permissions on the SAP file systems, modify the permissions as described in the Modify SAP File System Permissions section below and retry the installation.

7. Execute the following command on node-a to clean up SAP installation files:

[root@node-a ~]# rm -rf /root/.sapinst

Prepare Node-B For ERS Instance Installation

Complete the following steps to prepare node-b for installation of the ERS instance. In particular, this step will create the necessary users and groups, install SAP Host Agent, and install required binaries into the /usr/sap/SPS/SYS directory on node-b.

1. If installing from a remote system, add a firewall rule to allow inbound traffic on TCP port 4237 (the port which exposes the sapinst graphical interface) on node-b.

2. Execute the following command on node-b to initiate sapinst:

[root@node-b ~]# /sap-install/sapinst

*Note: The SAPINST_REMOTE_ACCESS_USER=<user> parameter may be used to allow login to the sapinst graphical interface by a non-root user.

*Note: If sapinst displays an error due to a missing dt_socket transport library, install the libnsl package with yum install -y libnsl.

3. To access the sapinst graphical interface, use a web browser to navigate to https://<node-b Public IP>:4237/sapinst/docs/index.html.

4. Select Software Provisioning Manager 2.0 SP XX → SAP S/4HANA Server 1909 → SAP HANA Database → Installation → Application Server ABAP → High-Availability System → Prepare Additional Cluster Node and click Next.

5. Provide the following parameters when preparing node-b for installation of the ERS instance.

Field	Value
Profile Directory	/sapmnt/SPS/profile
Password of SAP System Administrator	<SAP Admin Password>
Specify path to SAPHOSTAGENT.SAR	/sap-install
Yes, clean up operating system users	Click

6. Review the parameters and proceed with the installation.

*Note: If the installation fails due to insufficient permissions on the SAP file systems, modify the permissions as described in the Modify SAP File System Permissions section below and retry the installation.

7. Execute the following command on node-b to clean up SAP installation files:

[root@node-b ~]# rm -rf /root/.sapinst

Modify SAP File System Permissions

Execute the following commands on both node-a and node-b to set the correct permissions on the SAP file systems:

# chown -R spsadm /export/sapmnt/SPS /sapmnt/SPS /usr/sap/SPS
# chgrp -R sapsys /export/{usr/sap,sapmnt} /sapmnt /usr/sap

Install the ERS Instance on Node-B

Complete the following steps to install the ERS20 instance on node-b.

1. If installing from a remote system, add a firewall rule to allow inbound traffic on TCP port 4237 (the port which exposes the sapinst graphical interface) on node-b.

2. Execute the following command on node-b to initiate sapinst with the virtual hostname associated to the ERS instance:

[root@node-b ~]# /sap-install/sapinst SAPINST_USE_HOSTNAME=sps-ers

*Note: The virtual host name used as the value of the SAPINST_USE_HOSTNAME parameter must resolve to the ERS instance virtual IP that was created and protected in the section of Create ASCS and ERS Virtual IPs that you followed.

*Note: The SAPINST_REMOTE_ACCESS_USER=<user> parameter may be used to allow login to the sapinst graphical interface by a non-root user.

*Note: If sapinst displays an error due to a missing dt_socket transport library, install the libnsl package with yum install -y libnsl.

3. To access the sapinst graphical interface, use a web browser to navigate to https://<node-b Public IP>:4237/sapinst/docs/index.html.

4. Select Software Provisioning Manager 2.0 SP XX → SAP S/4HANA Server 1909 → SAP HANA Database → Installation → Application Server ABAP → High-Availability System → ERS Instance and click Next.

5. Provide the following parameters when installing the ERS instance. The icon indicates that the default option is chosen.

Field	Value
Profile Directory	/sapmnt/SPS/profile
Password of SAP System Administrator (spsadm)	<spsadm User Password>
Specify path to SAPHOSTAGENT.SAR	/sap-install
Password of SAP System Administrator (sapadm)	<spsadm User Password>
User ID	Leave empty
Group ID of sapsys	Use default value
Name of the ASCS Instance to be Replicated	ASCS10
Number of the ASCS Instance to be Replicated	10
Number of the ERS Instance	20
ERS Instance Host	sps-ers
Yes, clean up operating system users	Click

6. Review the parameters and proceed with the installation.

*Note: If the installation fails due to insufficient permissions on the SAP file systems, modify the permissions as described in the Modify SAP File System Permissions section above and retry the installation.

7. Execute the following command on node-b to clean up SAP installation files:

[root@node-b ~]# rm -rf /root/.sapinst

Modify /usr/sap/sapservices on Both Nodes

Since we only installed the ASCS10 instance on node-a and only installed the ERS20 instance on node-b, the /usr/sap/sapservices file is incomplete on each node. Modify this file on both node-a and node-b so that it contains entries for both the ASCS10 and ERS20 instances.

# vi /usr/sap/sapservices
# cat /usr/sap/sapservices
#!/bin/sh
LD_LIBRARY_PATH=/usr/sap/SPS/ASCS10/exe:$LD_LIBRARY_PATH; export LD_LIBRARY_PATH; /usr/sap/SPS/ASCS10/exe/sapstartsrv pf=/usr/sap/SPS/SYS/profile/SPS_ASCS10_sps-ascs -D -u spsadm
LD_LIBRARY_PATH=/usr/sap/SPS/ERS20/exe:$LD_LIBRARY_PATH; export LD_LIBRARY_PATH; /usr/sap/SPS/ERS20/exe/sapstartsrv pf=/usr/sap/SPS/SYS/profile/SPS_ERS20_sps-ers -D -u spsadm

Restart the ASCS Instance to Enable Enqueue Replication

Now that the ERS instance has been installed on node-b, the ASCS instance and its corresponding SAP Start Service process must be restarted on node-a in order to enable enqueue replication.

1. Verify that the following lines appear in the default profile for the SPS SAP installation (/usr/sap/SPS/SYS/profile/DEFAULT.PFL). If they do not exist, add them.

enq/replicatorhost = sps-ers
enq/replicatorinst = 20

2. Execute the following commands on node-a to restart the ASCS instance and verify that enqueue replication has been enabled.

[root@node-a ~]# su - spsadm -c "sapcontrol -nr 10 -function StopWait 60 2"
15.03.2021 00:29:23
Stop
OK
[root@node-a ~]# su - spsadm -c "sapcontrol -nr 10 -function RestartService SPS"
15.03.2021 00:29:44
RestartService
OK
[root@node-a ~]# su - spsadm -c "sapcontrol -nr 10 -function StartWait 60 2"
15.03.2021 00:30:07
Start
OK
[root@node-a ~]# su - spsadm -c "sapcontrol -nr 10 -function EnqGetStatistic | grep replication_state"
replication_state: GREEN

Verify Successful ASCS and ERS Installation

Execute the following commands to verify that the ASCS10 and ERS20 instances are running successfully on node-a and node-b, respectively.

1. [root@node-a ~]# su - spsadm -c "sapcontrol -nr 10 -function GetProcessList"
   01.01.2021 00:00:00
   GetProcessList
   OK
   name, description, dispstatus, textstatus, starttime, elapsedtime, pid
   msg_server, MessageServer, GREEN, Running, 2021 01 01 00:00:00, 0:00:00, 8420
   enq_server, Enqueue Server 2, GREEN, Running, 2021 01 01 00:00:00, 0:00:00, 8428

2. [root@node-b ~]# su - spsadm -c "sapcontrol -nr 20 -function GetProcessList"
   01.01.2021 00:00:00
   GetProcessList
   OK
   name, description, dispstatus, textstatus, starttime, elapsedtime, pid
   enq_replicator, Enqueue Replicator 2, GREEN, Running, 2021 01 01 00:00:00, 0:00:00, 25263

Install PAS and AAS Instances

Once the database (e.g., SAP HANA) has been installed and configured for high-availability, use SWPM 2.0 to install one Primary Application Server (PAS) and one Additional Application Server (AAS) instance on two external application server nodes spread across two availability zones. As application server redundancy is provided by the existence of the AAS instance, the application server instances do not require LifeKeeper protection. Note that the previously created NFS shares for the /sapmnt/SPS and /usr/sap/trans file systems must be mounted on both the PAS and AAS instance hosts before installation. Please consult SAP documentation for details on the installation of the PAS and AAS instances.

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