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3-52 IBM Informix OnLine Database Server Administrator’s Guide
Change Pathname of Archive Tape Device
If the TAPEDEV and LTAPEDEV values are the same, you must ensure that the
logical logs do not fill before the archive completes. If the logical log files fill
while the archive is under way, normal OnLine processing stops. Refer to
page 3-47 for guidelines on planning an archive schedule. Refer to page 3-59
for an explanation of what happens if the logical log files become full during
an archive.
TAPEBLK and TAPESIZE
Verify that the current block size and tape size are appropriate for the device
specified. The block sizeof thelogical log tape device is specified as TAPEBLK.
The tape size is specified as TAPESIZE.
If TAPEDEV is specified as /dev/null, block size and tape size are ignored.
Specify TAPEBLK as the largest block size permitted by your tape device.
OnLine does not check the tape device when you specify the block size.
Verify that the TAPEDEV tape device can read the block size that you specify.
If not, you cannot restore the tape.
Specify TAPESIZE as the maximum amount of data that should be written to
this tape.
Change Pathname of Archive Tape Device
The archive tape device is specified as TAPEDEV in the configuration file.
You can change the value of TAPEDEV while OnLine is in online mode. The
change takes effect immediately.
Be prepared to create a level-0 archive immediately after you make the
change, unless you change the value to /dev/null.
You can establish the value of TAPEDEV as a symbolic link, enabling you to
switch between more than one tape device without changing the pathname.
Important: Any time you change the physical characteristics of the tape device, you
must create a level-0 archive. Otherwise, you might be unable to restore the complete
set of tapes. OnLine cannot switch tape devices during a restore. OnLine will expect
all archive tapes to have the same block size and tape size as were specified at the time
of the most recent level-0 archive.