RDF/IMP and IMPX System Management Manual (RDF 1.4+)

Introducing RDF

HP NonStop RDF/IMP and IMPX System Management Manual—524388-001

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Online Dumps

With RDF/IMP and IMPX all backup databases are audited by TMF. Among other

things, this means that you can take online dumps of a backup database at any time,

thereby minimizing the amount of time necessary to perform any subsequent takeover

operation. For information about taking dumps while the updaters are running, see

Section 5, Managing RDF.

EMS Support

RDF/IMP and IMPX both support the Event Management System (EMS). They direct

their command, event, warning, and error messages to an EMS collector in the form of

fully-tokenized messages.

You can view messages in the EMS log online using Viewpoint or any other tool you

normally use for monitoring $0. Note that when you do so you are perusing the entire

EMS log. You can, however, use the standard EMS filter RDFFLTO to isolate RDF

messages into an entry-sequenced file which you then can examine using the

RDFSCAN online utility.

SMF Support

RDF supports the use of the NonStop Storage Management Foundation (SMF) product

on both the primary and backup RDF systems. The database on the primary system

can reside on SMF virtual disks, as can the replicated database on the backup system.

All combinations of replication from physical disk to virtual disk, virtual disk to physical

disk, and virtual disk to virtual disk are supported.

There are some issues and restrictions that you should be aware of before using RDF

in an SMF environment; these are discussed in detail under Using SMF With RDF in

Section 2.

RTD Warning Thresholds

RDF/IMP and IMPX allow you to designate a pair of RTD warning thresholds: one for

the extractor, and another for all of the updaters. Having set those thresholds, you then

can issue a STATUS RTDWARNING command with a designated repeat interval to

display information and statistics for only those processes (the extractor or any

updater) that have fallen behind the configured RTD threshold. For information about

setting the RTD threshold, see the SET RDF command description.