Resetting a Duplex Pair to Two Simplex Volumes

SETCACHE RESETTOSIMPLEX terminates a duplex pair and restores both volumes to simplex operations. The primary volume retains the DASD fast write status of the dual copy logical volume. The secondary volume assumes the device status defaults, unless the pair was suspended, in which case the caching status is inactive. Normally, all updates in NVS and cache are destaged to both the primary and the secondary volumes.

The primary volume contains copies of all updates to the volume. Because of a DASD fast write pending condition (probably due to another job), modified tracks might not have been destaged to the secondary volume. If the volumes must be identical, either use a utility program to compare the two volumes, or change the secondary volume serial number using ICKDSF, vary it online, and copy the primary volume to the secondary volume.