HP HPE VAN SDN Controller 2.7 - Page 166

6. Navigate to the /opt/sdn/cassandra/bin directory and enter the following command:
/opt/sdn/cassandra/bin# ./nodetool status
7. Copy the Host ID of the Cassandra instance that has a state of DN in the output of the
command you entered in the previous step. For example, the last entry in the following output
is the Cassandra instance for the controller that was stopped:
Datacenter: datacenter1
=======================
Status=Up/Down
|/ State=Normal/Leaving/Joining/Moving
-- Addres Load Tokens Owns (effective) Host ID Rack
UN 192.0.2.142 1.23 GB 1 100.0% 4245b8ab-6c3c-4755-bb28-90850d3a4a24 rack1
UN 192.0.2.140 1.23 GB 1 100.0% c172bbe2-799c-4adf-bd38-690dfa75ac79 rack1
DN 192.0.2.141 310.11 MB 1 100.0% 26999328-abec-4d80-a689-eb8b1f7f89d1 rack1
8. Remove the Cassandra instance from the cluster by entering the ./nodetool removenode
HostID command, where HostID is the identifier of the Cassandra instance to remove.
For example:
/opt/sdn/cassandra/bin# ./nodetool removenode
26999328-abec-4d80-a689-eb8b1f7f89d1
9. Log out of the server.
/opt/sdn/cassandra/bin# exit
10. From the Linux prompt of the server for the controller you stopped, delete the Cassandra
data:
/opt/sdn/cassandra/data# rm -rf *
/opt/sdn/cassandra/commitlog# rm *
/opt/sdn/cassandra/saved_caches# rm *
11. Restart the controller and Cassandra database, then log out of the server:
/opt/sdn/cassandra/bin# service sdnc start
/opt/sdn/cassandra/bin# exit
166 Troubleshooting