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Note 3.13                       Run-Time problems                       13 of 19
VXCERN::TIMBL "Tim Berners-Lee CERN/DD"              18 lines  13-JUN-1988 12:02
             -< "No I/O channels available" with Ethernet and BI >-
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    When using raw ethernet communications under VMS on a BI machine
    using a DEBNT interface, OPAL have noticed problems when using many
    protocol types on the same machine. It seems that whether they are
    used by RPC or other applications, after 6 or so, the error
    "No I/O channels available" is given.  This error message normally
    refers to VMS I/O channels, for which there is a process quota,
    but in this case it must be refering to something else.
                  
    1.	It is dependent on the number of processes using raw ethernet
    	in the SYSTEM.
    
    2.	The error is returned not by $ASSIGN, but by the QIO which does
    	IO$_SETMODE call to configure the channel. It is at this point
	that the buffers are requested and the protocol type specified.
    
    My wild guess based on these facts is that there is some limit on the
    ability of the DEBNT interface to multiplex different protocol types,
    but it could be a modifiable system parameter. No cure found yet. 
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Note 3.14                       Run-Time problems                       14 of 19
VXCERN::TIMBL "Tim Berners-Lee CERN/DD"               6 lines  25-JUN-1988 13:42
                                  -< re 3.13 >-
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    Normal Gee noticed that if you raise the some of the memory parameters
    (non-paged dynaic memory) and one of the cluster parameters, you
    can raise the limit on protocol types.
    
    See also a problem described in note FNAL::SYSTEMS 79.0 which
    seems to be different but similar.