Secondary system log

The secondary system log stream for DFSMStvs is called the shunt log. The name of the shunt log must be as follows:

IGTWTVnnn.IGWSHUNT.SHUNTLOG

In the name, nnn completes the DFSMStvs instance name.

The shunt log must be allocated before you start DFSMStvs. This log stream is connected during DFSMStvs initialization and disconnected when the DFSMStvs instance ends.

This log stream is used for the following units of recovery:

Units of recovery that DFSMStvs is unable to complete (for example, due to an I/O error or unavailability of a resource, such as a volume or a cache)
Long-running units of recovery. The log entries are moved to the shunt log.