RDF System Management Manual for J-series and H-series RVUs (RDF 1.10)

• It is an error if the specified atindex does not correspond to a valid index of a configured
auxiliary audit trail. That is, if you have configured two TMF auxiliary audit trails with the
respective audit trail numbers of 1 and 2, you cannot configure an auxiliary extractor with
an atindex value of 3.
• It is an error to specify two extractors or two receivers with the same atindex value.
Configuring Image Trails
Each image trail must be exclusively managed by a single receiver process, and all audit records
stored in an image trail must come from the same primary system audit trail. Therefore, if your RDF
environment is to protect primary system data volumes that are configured to auxiliary audit trails,
you must use this command to associate each image trail with the appropriate receiver:
SET IMAGETRAIL ATINDEX atindex
where atindex is an integer value from 0 through 15 specifying which receiver manages the
image trail. 0 specifies the receiver associated with the MAT; 1 through 15 specifies the receivers
associated with auxiliary audit trails AUX01 through AUX15, respectively.
The default value is 0.
After the SET IMAGETRAIL ATINDEX command, you must issue an ADD IMAGETRAIL command.
Configuring Updaters
The SET VOLUME command includes this optional syntax:
ATINDEX atindex
where atindex is an integer value from 0 through 15 specifying the audit trail to which that data
volume is mapped on the primary system. 0 specifies the MAT, and the data volume on the primary
system must be mapped to the MAT. 1 through 15 specifies auxiliary audit trail AUX01 through
AUX15, respectively, and the data volume on the primary system must be mapped to the designated
auxiliary audit trail.
The default value is 0.
NOTE: Data volumes on the backup system need not be mapped to the same audit trail as on
the primary system. If a data volume on the primary system is mapped to the MAT, for example,
the corresponding updater volume on the backup system can be mapped to an auxiliary audit
trail.
Error Conditions
• It is an error if the specified image trail atindex does not map to a receiver with the same
atindex.
• It is an error if the updater’s atindex does not equal the same audit trail index to which the
data volume on the primary system is mapped.
• It is an error if the atindex of the updater and its image trail are not the same.
Ramifications for STOP TMF, Stop-Update-to-Time, and SQL Shared Access
DDL Ops
Under normal circumstances, auxiliary extractors always run ahead of the master extractor.
Abnormal situations, such as CPU failures, can cause auxiliary extractors to fall behind the master
extractor.
If an auxiliary extractor is running behind the master extractor when you issue a STOP TMF
command, the TMF shutdown operation cannot complete until the auxiliary extractor has caught
up with the master extractor. When that happens, RDF (or more specifically, the master receiver
process) might falsely appear to be hung. As soon as the auxiliary extractor has caught up, however,
Configuring Image Trails 277