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M204.2720  VIO not allowed with XMEMOPT​=​2

An attempt was made to open a file whose DD card indicates a VIO data set, but the IOS Branch Entry feature is enabled by the XMEMOPT X'02' bit. When IOS Branch Entry is being used, VIO data sets may not be used as Model 204 files.

System manager response: Probably the use of the VIO data set should be eliminated. If VIO was being used for CCATEMP, it is much better to use CCATEMP in storage by setting TEMPPAGE. If there is a compelling reason to use a VIO data set, then the XMEMOPT X'02' bit should not be set, though this will adversely affect I/O CPU overhead and prevent the use of above-the-bar buffers (NUMBUFG greater than 0).

Message attributes:

RETCODEO=0Sets online return code
RETCODEB=4Sets batch (single user) return code
CLASS=EError class; the message can be suppressed with the X'04' bit setting of the MSGCTL parameter
AUDITMSWrites the message with line type MS to the audit trail
NOCOUNTDoes not increment the error count (ERCNT) parameter

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