Checking HANA DB replication status

The HANA database would have a ID such as ABC. In that case use following steps to check database replication status

Login into both primary and secondary servers as root
Connect to DB admin account on both machines using
```
su - <abc>adm
```
where <abc> should be replaced with HANA DB ID
Check whether database is running using:
```
HDB info
sapcontrol -nr 00 -function GetProcessList
```
In HDB info output, if we see process with command starting with string 'sapstart' then DB is running. Otherwise it is stopped.

We can get more help via 'sapcontrol -h'. Here '00' is the instance ID. If instance ID is 10 then use '-nr 10' instead, etc.

'HDB start' is used to start the DB and 'HDB stop' is used to stop the DB. These internally call sapcontrol appropriately to start/stop DB. See https://blogs.sap.com/2017/11/28/sap-hana-under-the-hood-hdb-by-the-sap-hana-academy/
First we can check which machine is primary and which is secondary via:
```
hdbnsutil -sr_state
```
Then check replication status using:
```
cd /usr/sap/<ABC>/HDB10/exe/python_support
python systemReplicationStatus.py
```
where <ABC> should be replaced with HANA DB ID
In case of power architecture the folder where systemReplication.py is could be
cd /hana/shared/<ABC>/exe/linuxppc64le/HDB_<version>/python_support
where <version> is a long alphanumeric string

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