Directly from the reseveredslots source provided with sourcemod...
Code:
CreateConVar("sm_reserved_slots", "0", "Number of reserved player slots", 0, true, 0.0);
CreateConVar("sm_hide_slots", "0", "If set to 1, reserved slots will hidden (subtracted from the max slot count)", 0, true, 0.0, true, 1.0);
CreateConVar("sm_reserve_type", "0", "Method of reserving slots", 0, true, 0.0, true, 2.0);
CreateConVar("sm_reserve_maxadmins", "1", "Maximum amount of admins to let in the server with reserve type 2", 0, true, 0.0);
CreateConVar("sm_reserve_kicktype", "0", "How to select a client to kick (if appropriate)", 0, true, 0.0, true, 2.0);
Alternateively to see current values, in your console, you can type sm cvars reservedslots