When you use the warm start initialization process to start a single member the warm start is referred to as a single-member warm start. During a single-member warm start, JES2 only re-queues jobs that were previously active on the member.

When you start the first member in a MAS configuration that is being initialized after an IPL or clean shutdown of JES2 ($P JES2), the warm start is referred to as an all-member warm start.

An all-member warm start applies to every member of the MAS configuration. Because no other member is currently using the checkpoint data set, this is the only time that activities such as verifying internal control blocks for all jobs in the MAS configuration may occur. All jobs that were previously active on any processor are re-queued to their respective queues.