S4/HANA Cost-optimized Cluster Setup

To support the high availability of your SAP system, the IT team can install SAP in a cluster environment. A cluster is a group of two or more connected servers that are configured with the same operating system, databases, and applications. These connected servers are referred to as “nodes.”

Procedure

1. BACK UP

1.1 Take the backup of the existing system database

1.2 Check the replication status

1.3 INSTALL NTP PACKAGE ON BOTH NODE

Execute the following commands:

• zypper in ntp
• echo “server ntp1.esds.co.in” >> /etc/ntp.conf

1.4 INSTALL HA_SLES PACKAGES

Execute the following command

• zypper in –t pattern ha_sles

1.5 Installation completed

1.6 Enable SOFTDOG

Execute the following command to enable

• lsmod | grep softdog

2. STOP NTP –> on both the nodes

Command

• rcntpd stop

3. How to add the shared disk on Node1

• Note: Maintain the following parameters

Disk provisioning – Thick Provision Eagar Zeroed

Sharing- Multi-writer

Virtual Device Node- SCSI controller 1

Stonith disk- 5 GB

4. CONFIGURE WATCHDOG ON BOTH NODES

Commands:

• lsmod | grep soft — > check whether watchdog is configured or available
• ls -lrt /etc/modules-load.d/
• echo softdog > /etc/modules-load.d/watchdog.conf
• cat /etc/modules-load.d/watchdog.conf
• lsmod | grep softdog
• modprobe softdog
• lsmod | grep softdog

5. SSH –KEYGEN CONFIGURATION

Command:

• ssh-keygen

6. CHECK THE CLUSTER CONFIGURATION

Command:

• crm status

7. HOW TO ADD SDB STONITH DISK ON 2nd NODE

Commands:

• sbd -d /dev/disk/by-id/scsi-36000c29aae4ad3f3ebe78d012dcfd69a create
• sbd -d /dev/disk/by-id/scsi-36000c29aae4ad3f3ebe78d012dcfd69a dump
• sbd -d /dev/disk/by-id/scsi-36000c29aae4ad3f3ebe78d012dcfd69a list

7.1 Enable NTPD &Cluster enable

Command:

• systemctl enable ntpd
• ha-cluster-join

7.2 Check the cluster configuration

Execute the following commands

• crm status
• crm configure property management-mode-“true”

8. HOW TO ADD VIRTUAL IP ON PRIMARY NODE

8.1 Database File system issue

Note: Configure reverse replication

9. ENABLE REVERSE REPLICATION

9.1 Configured the HANA replication PRIMARY to SECONDARY

10. HOW TO ADD SAP APPLICATION IN CLUSTER

Enter the URL – <ipaddress>:<port>/login

Username – hacluster

Password – linux

Go to –>SAP HANA SR Scale-Up Performance-Optimized

10.1 Enter the HANA application parameters

10.2 Configure cluster resources

10.3 Check status

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