Explanation
XCF is removing a system from the
sysplex. The system which is to be removed must be system reset before
the operator replies DOWN to this message.
Note: - The system reset is needed to ensure that the system image being
removed from the sysplex no longer has the capability to perform
I/O to devices which may be shared with other systems that remain
active in the sysplex. If this reset is not performed before replying
to this message, then severe data integrity problems may result.
When the subject system is removed from the sysplex, XCF will clean
up resources (such as locks, ENQs, and reserves) which are held by
that system, and make them available to other systems in the sysplex.
If the subject system is in fact still active, and operating in the
belief that it still holds these resources, unpredictable results
may occur.
- When this message appears, it is important that the appropriate
system reset action be taken, and that this message be replied to
in a timely fashion. While this message is outstanding, XCF must still
consider the subject system to be (at least potentially) active in
the sysplex, and therefore XCF cannot clean up resources (such as
locks, ENQs, and reserves) which are held by that system. These resources
will remain unavailable to all other systems in the sysplex until
this message is replied to, and the system completes the process
of being removed from the sysplex. Extended unavailability of these
resources is likely to cause delays, timeouts, or other problems for
the other systems in the sysplex.
- There are instances when this message will be issued
and the appropriate action must be taken even though there is an SFM
policy active in the sysplex. If SFM cannot successfully isolate the
system image being removed, manual intervention will be required.
This message will be issued and must be responded to.
In the message text:
- sysname
- The name of the system XCF is removing from the sysplex.
System action
Processing continues. The system is not removed
from the sysplex until the operator performs a system reset and replies
DOWN.
Operator response
Before replying DOWN, a system reset
must be performed on system sysname. Perform the
hardware SYSTEM RESET or LOAD (IPL) function to ensure that system sysname is
reset. If system sysname is to be dumped (for
example, via Standalone Dump), take care to perform a SYSTEM-RESET-NORMAL
or LOAD-NORMAL function that does not clear the system storage. Once
system sysname is system reset, reply DOWN.
Note
that several acceptable alternatives to SYSTEM RESET or LOAD exist.
You may reply
DOWN after any action or condition listed below
occurs for system
sysname:
- SYSTEM RESET-NORMAL
- LOAD-NORMAL
- INITIATION OF STANDALONE DUMP (via LOAD-NORMAL)
- SYSTEM RESET-CLEAR
- LOAD-CLEAR
- POWER-ON-RESET
- NO POWER® to CPC where
system sysname resides
- Deactivation of the logical partition where system sysname resides
- Reset of the logical partition where system sysname resides.
- Processor on which sysname is
running is in a checkstopped state.
Note: Some of these system-reset alternatives might
cause the issuance of messages on remote systems that are connected
by the Ficon channel to channel connections to the target system.
Depending
on your hardware and your hardware operational procedures, the above
functions may be invoked explicitly or implicitly. For example, on
an HMC you may implicitly perform one of the above hardware functions
by dragging a CPC object or an image object and dropping the object
on the ACTIVATE task. The hardware function performed depends on
the activation profile associated with the object.
It is important
to note that, if system sysname is in a disabled
wait state, that is not, by itself, sufficient to guarantee that system sysname can
no longer access I/O devices that may be shared with other active
systems in the sysplex. However, if the system is configured so that
a system reset is automatically performed when a disabled wait state
is entered, then that is sufficient and there is no need to manually
reset the system again.
Source
Cross System Coupling Facility (SCXCF)
Module
Routing code
Descriptor code