Stopping and starting all LPARS deployed on power servers for SAP App and DB

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Stopping and starting all LPARS deployed on power servers for SAP App and DB

It is possible to required shutting down all LPARs, followed by power server for some UPS / Cooling / Network maintenance activity at DC. In such cases to shutdown and start entire SAP related infrastructure refer below steps:

SAP Infra shutdown process

1. Put the Linux cluster related to SAP App and DB in maintenance mode
2. SAP team should stop application servers
3. SAP team should stop database servers
4. Stop the pacemaker cluster serives in Application & Database servers as per Pacemaker start and stop for Hana DB and application servers
5. Shutdown all the LPAR's using:

   shutdown -h now

   Note: Backup LPAR should be powered of at last

6. Shutdown second VIOS server
7. Shutdown first VIOS server
8. Shutdown second physical host
9. Shutdown first physical host
10. Shutdown HMC VM
11. Shutdown Physical server hosting HMC VM
12. Shutdown storage
13. Shutdown Tape Library

SAP Infra start up procedure

1. Start Tape Library
2. Start storage
3. Start Dell host
4. Start HMC VM

   Note: After storage, wait for 15-20mins for start physical hosts

5. Start primary physical host
6. Start seconday physical host
7. Start primary VIOS server
8. Start secondary VIOS server
9. Start Database primary LPAR.
10. Start Database secondary LPAR.
11. SAP team start the Database in both the LPARs, Replication between the databases should work
12. Start the pacemaker cluster in primary node as per Pacemaker start and stop for Hana DB and application servers
13. Start the pacemaker cluster in secondary node

    Primary and Secondary nodes cluster services are in maintanence mode, because custer services was stopped in the maintenance mode state

14. Get confirmation from SAP team on Database & Replication services working status
15. Remove the database primary node from the maintenance using:

    crm node ready <nodename>

16. Remove the database secondary node from the maintenance
17. Get confirmation from SAP team on the Database & Replication services working status
18. After nodes are in online state, Then only cluster services is in start state. Check cluster services health using:

    crm status

19. Start the Application Primary LPAR
20. Start the Application Secondary LPAR

    Primary and Secondary nodes are in maintanence mode, because custer services was stopped in maintenance mode state

21. Remove the Application primary node from the maintenance using:

    crm node ready <nodename>

22. Remove the Application secondary node from the maintenance.
23. After nodes are in online state, Then cluster services is in start state and able to see all the mount points
24. SAP team will start APP services in Primary & Secondary nodes as per Pacemaker start and stop for Hana DB and application servers
25. Start all the LPARs

    Note: Backup LPAR should start last

Refer:

• https://documentation.suse.com/sle-ha/15-SP1/html/SLE-HA-all/cha-ha-maintenance.html

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