[IBM i]

SIP high availability

SIP uses the high availability features that are included in the product to offer a comprehensive high availability solution.

The following topics describe how high availability is implemented for this product.

SIP high availability architectural considerations

SIP proxy configuration considerations

Core groups and Distribution and Consistency Services (DCS)

A core group is a set of processes that handles high availability activities. Each core group has a coordinator function that manages all the singleton services running in the core group. Typical SIP deployments require only a single core group. For extremely large-scale deployments, such as 50 or more cell members, multiple core groups may be required.

The core group coordinator does the following:
  • Maintains all group information – group name, group members, the policy of the group, and the state of each group member
  • Assigns singleton service to group members and handles failover of singleton services.

For more information on core groups, read about high availability domain core groups.

DCS failure detection

For details on the core group failure detection mechanisms and algorithms, see the information on core group discovery and failure detection protocols.

DCS failure detection includes:
  • Active failure detection using a tunable heartbeat mechanism that monitors:
    • Time interval between heartbeats
    • Number of heartbeats lost before declaring failure
  • TCP KEEP_ALIVE / Sockets closing
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Last updated: April 18, 2014 05:01 AM CDT
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