Specifies the maximum number of I/Os which will be allowed to be
    active at any time across all paths to all LUNs on the selected
    WWIDs. SANCP and the port drivers will enforce minimum and maximum
    values, are currently 8 and 65,535 (decimal) respectively

    Changing a WWID's I/O cap to other than the stock value can greatly
    impact I/O performance, so, to ensure that only intended WWIDs are
    modified, unless /DEFAULTS is used /CAP is only supported with some
    combination of /PORT, /NODE and /PRODUCT_ID