LAN Configuration and Management Manual

Introduction to the SLSA Subsystem
LAN Configuration and Management Manual—520469-012
2-17
Loss of a Processor
When access to a SAC is lost, SLSA events are generated and stored in the EMS log.
The following events may indicate that the SAC has become unavailable to a
processor:
Loss of a Processor
If a processor becomes unavailable to a SAC, the SLSA subsystem performs the
following steps to maintain the data paths to the adapter:
1. For those SACs where the unavailable processor is the owner, the LANMAN
process assigns ownership of the SAC to the next available processor in the
access list.
2. All LANMON processes that have access to the SAC notify the SLSA clients (PAM,
TCP/IP, or IPX/SPX) that one of the processors in the access list has lost access to
the SAC.
When ownership of a SAC changes because a processor is unavailable, SLSA events
are generated and stored in the EMS log. The following events may indicate that
ownership of the SAC has been reassigned because a processor was unavailable:
Loss of Access of All Processors to a SAC
If a SAC becomes unavailable to all processors, the SAC goes from STARTED to
STARTING and the controlling LANMON tries to reestablish the connection to the SAC.
If the LANMON is successful, the SAC goes to the STARTED (available) state. The
system continues trying to start the SAC until successful.
Event Number Cause
4001 SAC transient fault with a fault number of 2011 to 2014, 2018, 2033,
2036, 2040, 2044, 2045, 3011 to 3018, 3025 to 3027, 3036, 3038,
3043, 3046, or 3047.
4007 SAC ownership change
4009 SAC state after ownership change
4102 PIF available
Event Number Cause
4603 LANMON unavailable
4007 SAC ownership change
4009 SAC state after ownership change
4102 PIF available