Compaq AAR-88LB-TE manual Preserving the Old Environment, Process Quotas

Installation

2.2 Preserving the Old Environment

2.2 Preserving the Old Environment

Applications that run in the RTR Version 2 environment on OpenVMS systems will run in the RTR Version 3 environment on OpenVMS systems. However, as part of your testing and verification of the new environment, you should check that an RTR Version 2 application runs as expected after the upgrade.

You cannot mix RTR Version 2 and Version 3 routers and back-end systems; all routers and back-end systems in a facility must be either RTR Version 2 or RTR Version 3. Front-end systems can be either Version 2 or Version 3.

2.3Can Both RTR Version 2 and Version 3 Coexist On the Same Node?

No, RTR Version 2 and Version 3 cannot coexist on the same node.

2.4Can RTR Version 2 and Version 3 Applications Coexist on the Same Node?

Under most circumstances, RTR Version 2 applications will run in the RTR Version 3 environment unchanged, and RTR Version 2 and Version 3 applications can coexist on the same node, and exchange messages.

Because the RTR Version 2 API is frozen, any new features requiring a change in the API cannot be exploited from within an RTR Version 2 application. This may be a reason to consider migration. Additionally, if portability is an issue, migrate to RTR Version 3.

2.5 Process Quotas

RTRACP buffers all active transactions. All message information that was previously kept in the shared memory RTR cache is now kept within RTRACP process memory.

Because of the use of mailboxes to handle message traffic, mailbox quotas should generally be set larger than in Version 2. These quotas or limits include:

•AST queue limit

•Byte count limit for both the application and ACP

•Buffered I/O count limit

•Direct I/O count limit

•Paging file limit

•Timer queue entry limit

Table 2–1 provides estimates of values for these limits.

Note

Values in Table 2–1 supersede values previously documented.

2–2Installation