Differences between active-active and active-passive cluster

Differences between active-active and active-passive cluster

Active-active

Setup: Two active Servers are configured as companion servers,

each with independent workloads. These companions run on the

primary and secondary nodes, respectively, as individual servers

until one fails over.

Failover:

When fail over occurs, the secondary companion takes

over the devices, client connections, and so on from the primary

companion. The secondary companion services the failed-over

clients, as well as any new clients, until the primary companion

fails back and resumes its activities.

Failback:

Failback is a planned event during which the primary

companion takes back its devices and client connections from the

secondary companion to resume its services.

Client connection failover: During failover, clients connect to

the secondary companion to resubmit their uncommitted

transactions. During failback, clients connect to the primary

companion to resubmit their transactions. Clients with the

failover property reestablish their connections automatically.

Active-passive

Setup: A single active Server runs either on the primary node or

on the secondary node. The active Server runs on the primary

node before a fail over and the secondary node after fail over.

Failover: When a system fails over, the active Server and its

associated resources are relocated to, and restarted on, the

secondary node.

Failback: Failback is a planned fail over or relocation of the

active Server and its resources to the primary node. Failback is

not required, but can be done for administrative purposes.

Client connection failover: During failover and failback,

clients connect to the same active Server to resubmit

uncommitted transactions. Clients with the failover property

reestablish their connections automatically.