Specifying a Sysplex Group
The SYSPLEXGROUP
parameter associated with the SYSTEM
statement enables the name of an IBM Session Manager Sysplex Group to be specified for an IBM Session
Manager instance. On start-up, the IBM Session Manager instance will join this group and if a number of
other IBM Session Manager instances specify the same group name then they
will automatically connect to each other. Each IBM Session Manager instance must be in the same Sysplex (either in
the same instance of z/OS or other z/OS instances) and can be one of
several types (see below).
Types of IBM Session Manager instance
The type of Sysplex instance is specified using
the SYSPLEXTYPE parameter, also associated
with the SYSTEM statement. The possible
types of Sysplex instance are:
- Controller
Controls the planned transfer of all users from one IBM Session Manager instance to another, or the recovery of VTAM sessions
after a catastrophic failure to the IBM Session Manager environment.
- Note: On the mainframe, the SWITCHPLX
command is used in a Sysplex environment to transfer all users from one
instance to another.
- Standby Controller
Acts as a Controller when planned maintenance is required on the Controller,
or when the Controller fails.
- Normal instance
Allows its users to use conventional RECOVERYLEVEL
NONE VTAM sessions (and Telnet client sessions, and so on).
- Recovery instance
As for a Normal IBM Session Manager instance, but also allows its users to use RECOVERYLEVEL
HIGH and RECOVERYLEVEL INTERMEDIATE
sessions.
Sysplex recovery levels
On the APPL statement,
the RECOVERYLEVEL parameter specifies
the Sysplex recovery level. This parameter defines the recoverability
of forward sessions to the application when the ACB used is being opened.
Possible values are:
HIGH
- Recover the application session if the owning (target)
IBM Session Manager instance fails or the IBM Session Manager Controller fails. Can be used only with SYSPLEXTYPE I
IBM Session Manager instances.
INTERMEDIATE
- Recover the application session if the owning (target)
IBM Session Manager instance fails. This value can be used only with
SYSPLEXTYPE I IBM Session Manager instances.
NONE
- No recovery will be attempted for this application.
This value can be used with SYSPLEXTYPE I
or N IBM Session Manager instances.
Where can I find more information?
For more information on configuring and operating
a Sysplex in IBM Session Manager, and on implementing a VTAM session recovery mechanism,
see 'Parallel Sysplex support' in the IBM Session Manager Installation and Customization
manual.
Related topics:
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