RDF System Management Manual

Preparing the RDF Environment
HP NonStop RDF System Management Manual—524388-003
2-3
Data Communication (Expand) Resources
Data Communication (Expand) Resources
RDF sends filtered audit data from the primary system over the network to the backup
system. A communications path between the systems can be any form of Expand
linkage. Plan to configure sufficient communications resources between the primary
and backup systems so that RDF can do the following:
•
Handle the peak rate of audit data
•
Catch up processing in any audit trail if the communications paths go down and
are restored (without RDF reinitialization)
If you are using a dedicated Expand path with high throughput, you should set
PATHPACKETBYTES to 8192. If you are not using a dedicated Expand path, you
should use Multipacket frames with PATHBLOCKBYTES set to 8192. (See also
Specifying System Generation Parameters for an RDF Environment.)
RDF is designed to extract audit information from the primary system and transmit it to
the backup system as quickly as possible. If you are not using the ZLT capability, this
limits the number of transactions that could be lost if a disaster should occur at the
primary system. See Unplanned Outages Without ZLT in section 1.
To estimate the data communications resources needed for RDF, calculate the amount
of audit trail data generated per second during peak loads. If your business has
seasonal peaks, such as holidays or the ends of calendar quarters, consider the peak
rate at those times.
The discussion that follows pertains to the master audit trail. If you are replicating
auxiliary audit trails, you should use the same algorithm for each auxiliary audit trail.
Use the following sampling process once an hour for two weeks to establish your
needs:
1. Enter a FUP INFO command for the current TMF MAT and record the end-of-file
(EOF) value; for example:
FUP INFO $AUDIT.ZTMFAT.*
2. Enter a FUP INFO command for the current MAT 5 minutes later and record the
EOF value; for example:
FUP INFO $AUDIT.ZTMFAT.*
CODE EOF LAST MODIF OWNER RWEP TYPE REC BLOCK
$AUDIT.ZTMFAT
AA000003 134 11292672 10:05 -1 GGGG
CODE EOF LAST MODIF OWNER RWEP TYPE REC BLOCK
$AUDIT.ZTMFAT
AA000003 134 11653120 10:10 -1 GGGG