The following document explains various takeover and giveback scenarios involved in ElastiStor High Availability.
Sample Setup Assumptions
- Nodes in your ElastiStor Appliance ESA-A50 are called Node1 and Node2.
- The Nodes are in a HA Group.
- Node1 is the primary ElastiCenter and Node2 is the secondary ElastiCenter.
- Node1 hosts Pool1, VSM1 and Storage Volume1.
- Node2 hosts Pool2, VSM2 and Storage Volume2.
Downtime and takeover scenarios
Note: These are random scenarios and do not occur in sequence.
|Scenario||Reason/Event||System action||Corrective measure||Result|
|Node1 is down, Node2 takes over.||
||Bring up Node1 online and move it to Available State.||
|Node2 is down, Node1 takes over Pool2.||
||Bring up Node2 online and move it to Available State.||
|Node1 is in Maintenance mode.||Administrator wants to service the Node.||
||Move Node1 to Available State.||Pool1 is moved back to Node1.|
|Node2 is in Maintenance mode.||Administrator wants to service the Node.||
||Move Node2 to Available State.||Pool2 is moved back to Node2.|
|Management network on Node1 failed.||
||Bring NIC of Node1 online.||
|Management network on Node2 failed.||
||Bring NIC of Node2 online.||
|Data network on Node1 failed.||
||Pool1 is moved to Node2.||Bring the network of Node1 online.||
|Data network on Node2 failed.||
||Pool2 is moved to Node1.||Bring the network of Node2 online.||