LU Support
A Host Integration Server node can support as many as 15,000 sessions.
Logical unit 6.2 (LU 6.2) works in combination with node type 2.1 to provide Advanced Program-to-Program Communications (APPC). An LU 6.2 can be either a primary logical unit (PLU) or a secondary logical unit (SLU). The partner LU can reside in a type 2.1 node, within an upstream type 5 node, or within the Host Integration Server node itself.
LU types 0, 1, 2, or 3 are always SLUs, and the partner LU in an upstream type 5 node is always the PLU. LU 0 supports session-level cryptography, within certain limits, on the Request Unit Interface (RUI). You implement session-level cryptography through Cryptography Verification (CRV) requests; the RUI applications must perform all necessary processing. For details about the limits of session-level cryptography and about the processing carried out by the RUI application, see the LUA Programmer's Guide. For all interfaces other than RUI, CRV requests are handled with a negative response.