VTAM® received an MVS™ VARY OFFLINE command for the subchannel cua in the MPC group defined in trlename. The command is not allowed because the subchannel cua is the last active Read or Write device in this MPC group.
trlename is the name of the TRLE that contains the subchannel.
cua is the subchannel address.
The VARY OFFLINE is ignored by VTAM and the CUA remains in a (system) pending offline state. Processing continues.
If the intention is to deactivate the entire MPC group, issue a VARY OFFLINE FORCE command for the CUA, or deactivate the users of the MPC group as follows:
See the z/OS Communications Server: IP Configuration Guide for an explanation of how the keyword LASTRW on the TRLE definition statement affects the VTAM processing related to VARY OFFLINE (when associated with the last active read or write device in an MPC group). Careful consideration should be given when deciding how this keyword should be defined for your operating environment.
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