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

Introducing RDF
HP NonStop RDF/IMP and IMPX System Management Manual—524388-001
1-16
Extractor Process
•
File incomplete records
•
File complete records
The extractor filters out all other records and does not send them to the receiver.
Among those filtered out are audit records for volumes and files not protected by RDF
(and files implicitly or explicitly excluded by INCLUDE/EXCLUDE lists) and most of the
physical audit records generated either for block splits or during FUP RELOAD
operations.
The extractor always tries to fill the buffer to be sent to the receiver. The buffer never
contains partial records; if the buffer is nearly full and the next record to be transmitted
does not fit in its entirety, the extractor transmits the current buffer and puts the record
at the beginning of the next buffer. The extractor never waits for more than one second
to send data to the receiver. If a buffer is not filled within a second, the extractor
transmits the buffer (even though it is not filled).
Figure 1-5. Extractor Process Operation
28 KB Buffers
Audit
File
Master Audit Trail (MAT)
Primary Disk Mirror Disk
56 KB
Read
Audit
File
56 KB
Read
Extractor
(incl. Filter)
Unneeded Data
Discarded
Expand Lines
28 KB Per Message
To Receiver
Primary node