Compaq AA-Q88CE-TE manual Creating a Recovery Journal, Example 2-2 Remote Setup from one Node

Starting and Setting Up RTR

2.2 Setting Up—An Example

Example 2–2 illustrates how to use RTR remote commands to start the same configuration. The set environment command is used to send subsequent commands to a number of RTR nodes.

Example 2–2 Remote Setup from one Node

% rtr

RTR> set environment/node= -

_RTR>		(FE1,	FE2, FE3, TR1, TR2, BE1, BR2, BR3)
RTR>	start rtr
RTR>	create facility funds_transfer/frontend=(FE1, FE2, FE3) -
_RTR>			/router=(TR1, TR2) -
_RTR>			/backend=(BE1, BE2, BE3)

You can enter the commands shown in Example 2–2 on any of the nodes in the configuration. However, you must have an account with the necessary privileges on the other nodes.

To find out if RTR has been started on a particular node, use the SHOW RTR command.

To find out which facilities have been created (if any) and how they are configured you can use the SHOW FACILITY and SHOW LINK commands. The full syntax of these commands is given in Chapter 6.

2.3 Creating a Recovery Journal

RTR writes data to journal files to be able to recover (that is, replay) partially executed transactions after a backend node failure.

For performance reasons, the journal may be spread across several disks. Specify the location and size of the journal using the CREATE JOURNAL command.

The CREATE JOURNAL command must be issued on each node where an application server will run. That is, on each backend node and on any router nodes where router call-out servers will run. It must be issued after installing RTR and before creating any facilities.

It may be issued again later to alter the size or location of the journal to improve performance. Use the MODIFY JOURNAL command to adjust journal sizes.

Cautionary Note for Journals

•The CREATE JOURNAL/SUPERSEDE command deletes the contents of any existing journal files. If transaction recovery is required, DO NOT ISSUE this command after a failure.

•Do not make backup copies of journal files without first making the original journal file read-only or the journal files will be considered spurious by RTR because it sees journal files that it did not create. In this case RTR will issue a %RTR-F-SPUJOUFILerror message.

Starting and Setting Up RTR 2–3