HOSTSA start option

Read syntax diagramSkip visual syntax diagramHOSTSA=1HOSTSA=subarea_number1
Notes:
  • 1 HOSTSA specifies the subarea number of this VTAM®. If HOSTSA is not coded, then a default subarea number of 1 is used.

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:
  1. 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.