An attempt was made to change the host cluster type to adminlun, but one of the mappings for one of the hosts in the host cluster has a SCSI LUN that exceeds the maximum for the adminlun type. The maximum number of SCSI LUNs for the default host type is 4096 (2048 for older hardware), and the maximum for the adminlun host type is 512.
Reduce the number of SCSI LUNs by using the rmvdiskhostmap command to remove at least one host mapping, then retry the command.