TMF Planning and Configuration Guide (H06.05+)

Doing an Initial Configuration
HP NonStop TMF Planning and Configuration Guide—540136-002
2-6
Two Examples of Typical Configurations
For example, assume your TMF configuration includes 15 data volumes, you dump
them weekly on a volume basis, and you make two or three audit dumps per day.
Ultimately, your TMF catalog must contain at least 186 tapes, as follows:
•
60 tapes to accommodate four generations of your 15 weekly online dumps
(assuming that each online dump can fit onto one tape)
•
126 tapes to accommodate three weeks’ worth of audit dumps (up to three per day
for 21 days; two copies of each)
Two Examples of Typical Configurations
The following application profiles represent typical TMF installations.
Example 1: Small-Scale Database, 10-Hour Work Day
Assume that the application to be protected by TMF has the following characteristics:
•
It has a 100-gigabyte database occupying three data volumes (named $DATA1
through $DATA3); the data is somewhat evenly distributed among the three
volumes (approximately 35 gigabytes on each volume).
•
It averages approximately one transaction each second over a 10-hour day with an
audit-generation rate of approximately 2 kilobytes for each transaction (translating
to an average daily audit-generation rate of approximately 72 megabytes).
•
The operators take online dumps of the database on a volume basis once each
week ($DATA1 on Monday, $DATA2 on Wednesday, and $DATA3 on Friday).
Assume the system has the following equipment available for use by TMF:
•
One disk drive, named $AUDIT, with three 72-megabyte files allocated immediately
as audit-trail files and the remaining space allocated as needed for audit-trail
overflow or audit-trail restoration when recovery is performed.
•
One magnetic tape drive (named $TAPE).
Since the average daily audit-generation rate is smaller than the capacity of one tape
medium and the maximum audit-trail file size, we will use the audit-generation figure as
our audit-trail file size (producing approximately one audit dump each day).
As mentioned previously, the operators make online dumps of that database on a
volume basis three times each week. By default, the TMF catalog maintains three
generations of the online dumps and all of the audit dumps necessary to support the
online dumps. Remember, however, that you should calculate the number of required
tapes based on four generations of online dumps because the oldest set of dumps is
not released until a new set actually exists.