IBM 000-8697 Examine Your Archive Conguration, The Archives, TAPEDEV Conguration Parameter

Operating OnLine 3-51
Examine Your Archive Configuration
Forfurther information about the relationship of the current configuration to
the values in the configuration file ($INFORMIXDIR/etc/$TBCONFIG), refer
topage 1-11.
The Archives
In the event of a system failure, OnLine can restore all data that has been
archived. Without archives, you cannot perform a restore.
Donot use the OnLine data-migration utilities to unload data as a substitute
for a complete archive. None of the data-migration utilities are coordinated
with the information stored in the logical log files. You cannot roll forward
information from the logical log without the archives.
To ensure the integrity of your archives, periodically verify that all OnLine
dataand control information is consistent before you create a level-0 archive.
Refer topage 4-6 for a detailed explanation of this consistency check.
TAPEDEV Configuration Parameter
TheTAPEDEV configuration parameter specifies the archive tape device. The
value you choose for TAPEDEV has the following implications:
■If the archive device differs from the logical log backup device, you
can schedule online archives without regard to the amount of free
space remaining in the logical log.
■You can create remote archives if you specifyTAPEDEV to be a tape
device managed by another host machine.
■If you specify/dev/null as the archive device, you avoid the
overhead of the archive. However, you cannot perform a restore.
Lookat the copy of your configuration file and compare the values specified
by TAPEDEV andLTAPEDEV.LTAPEDEV is the logical log tape device.
Ideally,TAPEDEVand LTAPEDEV each specify a differentdevice. When this is
thecase, you can execute online archives whenever you choose. The amount
of free space in the logical log is irrelevant.