Task 01. Verify Cluster

Before proceeding with the HA test, let’s verify that the cluster is normally state and connect to the instance through the Session Manager.

  1. Connect to prihana instance through Session Manager. After log in to AWS Management Console, Connect to EC2 Instance Console.
  2. Choose HANA-HDB-Primary instance and click Connect. image01-01
  3. Select Session Manager and click Connect. image01-02
  4. Check SAP HANA System Replication (HSR) status.

  • Check the status using hdbnsutil -sr_state command (using the hdbadm user)

    • You can see that HAP(prihana) site is primary and HAS(sechana) site is sync.
    sudo su - hdbadm
hdbnsutil -sr_state

    image01-03

  • Check the status using HDBSettings.sh systemReplicationStatus.py command (using the hdbadm user)

    • You can see that Primary node is prihana and Secondary node is sechana.
    HDBSettings.sh systemReplicationStatus.py

    image01-04

  • Check the status using SAPHanaSR-showAttr command (using root user)

    • You can see that sechana node is SOK
    exit
sudo su -
SAPHanaSR-showAttr

    image01-05

  1. Check the cluster configuration.

    • crm is a tool to configure and manage clusters.
    • To check how HA works, check the two options PREFER_SITE_TAKEOVER and AUTOMATED_REGISTER. If both are true, it means that Takeover is automatically performed, and if Secondary is normal, it is automatically registered.
    • Confirm Cluster configuration using the crm configure show command (using root user)
    crm configure show

    image01-06

  2. Check the cluster status.

    • crm_mon is a command that provides the current state of the cluster (using root user).
    • Execute this command to check if prihana is in Master status.
    crm_mon -rfn1

    image01-14

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