HP -UX SNAplus2 Bedienungsanleitung PDF herunterladen (Seite 360)

360 Appendix D

Using SNAplus2 in a High Availability Environment

SNAplus2 High Availability Features

for high availability environments in that applications running on client

systems can access ports on multiple servers. By providing applications

with multiple paths to the remote SNA system, the client/server

conﬁguration greatly reduces the number of single points of failure.

When an SNAplus2 application starts in a client/server conﬁguration, it

tries to locate a suitable LU that is available. It queries all of the servers

that are active to see if one of them can provide an LU that has been

conﬁgured to be used by the application. If one of the servers provide s a

suitable LU, an LU- LU session is established between the server and

the remote SNA system. The SNAplus2 application can then access that

LU-LU session. It is important to note that the SNAplus2 application

does not specify which of the active servers should provide the LU. I t is

possible that more than one server can be conﬁgured to provide a

suitable LU.

There are two ways that more than one server can provide a suitable LU

to an SNAplus2 application running on a client system. First, the

application can be conﬁgured to use multiple LUs, and those LUs can be

spread across multiple HP 9000 servers. If the ﬁrst LU is unavailable,

the application can request a different one. LU pools, if they contain LUs

that use multiple SNAplus2 LSs , can be used in this fashion. Similarly,

APPC transaction programs can be developed that access several local

LUs that are spread across multiple HP 9000 servers. Using this

technique, SNAplus2 applications can be given access to multiple paths

to the remote SNA system.

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HP -UX SNAplus2 Bedienungsanleitung Seite 360