RDF System Management Manual for H-Series RVUs (RDF 1.8)

Figure 1-6 Receiver Process Operation
With sorted image trails, the activity of any one image file typically remains so low that it can
be stored on the same disk volumes as the main database with no significant I/O impact. This
approach is not recommended, however, if you require very high RDF performance or if RDF
is running with the UPDATE option turned off; in this case, the image trails could eventually
fill the volume; in such cases, it is best to have volumes exclusively dedicated to the image trails.
NOTE: You should keep all image trail files off of the $SYSTEM volume and its controller.
Otherwise, if there is a lot of audit data to send from the primary system to the backup system,
it could take a while for the updaters to start.
Image trails can be added only after RDF has been initialized but before it has been started.
RDF Operations 51