If ACR is active, problem data for the pre-processing phase are:
- The CSDCPUAL field of the common system data (CSD) indicates which
processor failed and which is still running
- A system trace table entry with ACR in the IDENT column indicates
that ACR began and identifies the failing processor
- Use the CSD online mask to determine which CPU's LCCA to examine.
Use the IPCS subcommand CBFORMAT to examine the failing CPU's LCCA.
- The WSACACR in the CPU work save area vector table (WSAVTC) for
both processors' logical configuration communication areas (LCCA)
points to a copy of the PSAs and FRR stacks for both processors.
- The LCCADCPU in both processors points to the LCCA of the failing
processor and the LCCARCPU points to the LCCA of the running processor
Note that a dump shows the PSA of the failed processor when the
running processor initiated ACR. The normal FRR stack, pointers to
other FRR stacks, locks, PSA super bits, and other data reflect the
processor at the time of the failure.