While the system is processing a SETGRS MODE=STAR command, GQSCAN does not work (fails with return code X'0C' with reason code X'10'), and the following global resource serialization requests are suspended:

• ENQ
• DEQ
• RESERVE

The length of time global resource serialization requesters are suspended might be a few minutes while the ISGLOCK lock structure and global resource serialization sysplex couple data set records are initialized with all of the complex-wide information, and significant changes are made to the internal control block structures. IBM® recommends that you migrate at a time when the amount of global resource request activity is likely to be minimal.

• During the migration to a star complex, ISG377E and ISG378E might be issued, indicating a global resource serialization ring disruption is in progress, and might remain outstanding for a long time. This is normal. They will be removed before the ring complex has completed migration to a star complex.
• Because to the restructuring of global resource serialization control structures, some ABEND records might appear in LOGREC during a SETGRS MODE=STAR migration. However, no dumps will be taken for this class of expected abends.