Explanation
A SETCACHE request which requires that certain
volumes be offline was unsuccessful. The following requests require
the specified volume to be offline:
- SETSECONDARY (establish a duplex pair) requires the secondary
volume to be offline.
- REESTABLISHDUPLEX (reestablish a duplex pair) requires the alternate
volume to be offline.
System action
Programmer response
Vary the secondary/alternate device offline
(in ALL hosts attached to the subsystem) and rerun the command.
Source