ServerNet Cluster Manual

ServerNet Cluster Description
ServerNet Cluster Manual—520575-003
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SNETMON and the ServerNet Cluster Subsystem
•
Receives path-event information from the individual processors in the system and
translates this information into system-connection status information and EMS
events
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Responds to queries from OSM or TSM client applications using the Subsystem
Programmatic Interface (SPI) protocol
•
Provides ServerNet status and statistics information to SNETMON clients
•
Keeps its backup process up to date
SNETMON also maintains the ServerNet cluster subsystem state. State changes are
logged to $ZLOG as event ZCOM-EVT-SUMSTATE-CHG. There is no aggregate state
for the ServerNet cluster subsystem. The SNETMONs on each node have a peer-to-
peer relationship with each other. Each SNETMON maintains the state of objects
relevant to the local system and its connection to the ServerNet cluster.
SNETMON maintains state information about:
•
The ServerNet cluster subsystem on each member system.
•
Each individual ServerNet path from a processor on the local system to a
processor on a remote system.
•
The Expand-over-ServerNet line-handler processes. SNETMON does not
recognize the Expand-over-ServerNet line handler state model but does recognize
the identities (logical devices [LDEVs]) of the line-handlers that bind to it and of
their process state.
Figure 1-19 is a logical diagram that shows the interaction of SNETMON with other
ServerNet cluster software components.