HOSTSA start option


   .-HOSTSA--=--1------------------.   
>>-+-------------------------------+---------------------------><
   |                           (1) |   
   '-HOSTSA--=--subarea_number-----'

Notes:

HOSTSA specifies the subarea number of this VTAM®. If HOSTSA is not coded, then a default subarea number of 1 is used.

range:

1– to the maximum number of subareas allowed for the network

If HOSTSA= is coded and SACONNS= is not coded or SACONNS=YES is coded, then this VTAM will provide subarea function. If HOSTSA= is not coded, or HOSTSA= is coded and SACONNS=NO is coded, then this VTAM will not provide subarea function.

The combination of start options HOSTSA, NODETYPE, and SACONNS determines the overall node configuration and level of function support. The start options and resulting node configurations are intended to provide a smooth migration for existing subarea hosts.

See Table 1 for a summary of the node type functions. When the node is configured as a network node or end node, attempts to activate FID4 (PU types 4 or 5) connections will fail. However, if the node is a migration data host or an interchange node, FID4 connections are allowed.

Table 1. Node type functional summary
Node type	NODETYPE	HOSTSA	SACONNS	CP-CP sessions	SSCP-SSCP sessions	NCP ownership	Interchange function
Subarea Node	(not coded)	n ¹	n/a	no	yes	yes	no
Interchange Node	NN	n ¹	(not coded) or YES	yes	yes	yes	yes
Migration Data Host	EN	n ¹	(not coded) or YES	yes	yes	no	no
Network Node	NN	(not coded)	n/a	yes	no	no	no
Network Node	NN	n ¹	NO	yes	no	no	no
End Node	EN	(not coded)	n/a	yes	no	no	no
End Node	EN	n ¹	NO	yes	no	no	no
Note: n represents a subarea host number.

Note: If you want a node to function solely as an end node or network node (NODETYPE=EN or NN), then HOSTSA should not be coded or SACONNS=NO must be coded.

HOSTSA must be less than or equal to the maximum number of subareas specified (MXSUBNUM start option). See MXSUBNUM start option for more information on the MXSUBNUM start option.

Note: If you plan to incorporate a non-VTAM host, VTAM's SSCPID and HOSTSA start options values should be coded so that both values are either higher or lower than the non-VTAM host.