ServerNet Cluster Manual

ServerNet Cluster Description
ServerNet Cluster Manual—520575-003
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SNETMON and the ServerNet Cluster Subsystem
You add the ServerNet cluster monitor process as a generic process using the Kernel
subsystem SCF ADD PROCESS command. See the SCF Reference Manual for the
Kernel Subsystem for complete command syntax.
The ServerNet cluster monitor process must be configured:
•
To be persistent (set the AUTORESTART attribute to a nonzero value).
•
To have the process name $ZZSCL (set the NAME attribute to $ZZSCL). The
recommended symbolic name is ZZSCL.
•
So that the $ZPM persistence manager stops the process by sending in an internal
system message (set the STOPMODE attribute to SYSMSG).
•
To run under the SUPER.SUPER user ID (by default the USERID attribute is set to
the user ID of the current SCF session).
•
With at least two processors (preferably more) in the CPU list (defined by using the
CPU attribute).
SNETMON Interaction With Expand
For Expand, SNETMON interacts with the line-handler processes using the NAM
protocol to do the following:
•
Enable Expand line-handler processes to synchronize with each other during
startup
•
Enable detection that the remote Expand line-handler process is down
•
Inform the appropriate local line-handler process when the ServerNet cluster
connection to a remote system goes down
The ServerNet Cluster Subsystem
The ServerNet cluster subsystem is the system configuration environment that enables
ServerNet communication between processors in different nodes of a ServerNet
cluster. The following list summarizes naming and numbering for the ServerNet cluster
subsystem:
The ServerNet cluster subsystem can have four logical states:
•
STOPPED
•
STARTING
•
STARTED
•
STOPPING
Full Name ServerNet cluster subsystem
Subsystem Name SCL
Subsystem Acronym ZSCL
Subsystem Number 218