IBM eServer zSeries 900 Technical Guide

Chapter 5. Sysplex functions 203

When prohibiting a set of ports, if any of the ports are connected to managed subsystems,

then the PROHIBIT operation must be preceded by the VARY SWITCH command(s) to

disable the managed subsystem ports to Dynamic Channel Path Management. As in the

blocking case, this will cause any managed channels currently connected to the subsystem

port(s) to be deconfigured. Once the subsystem ports are disabled to Dynamic Channel Path

Management, the PROHIBIT function can be invoked. This must then be followed by the

VARY SWITCH command(s) to re-enable the prohibited subsystem ports to Dynamic

Channel Path Management.

When ports are unprohibited or unblocked, these operations need to be followed, as

necessary, by VA