When you issue RVARY SWITCH, RACF® associates a set of buffers with the new primary database (the old backup database) and dissociates the buffers from the old primary database (the new backup database).

If RACF is enabled for sysplex communication when you issue RVARY SWITCH, RACF associates the larger buffer with the new primary database (the original backup database) and the smaller buffer with the new backup database (the original primary database).