3-52 IBM Informix OnLine Database Server Administrator’s Guide
Change Pathname of Archive Tape Device
Ifthe TAPEDEV and LTAPEDEVvalues are the same, you must ensure that the
logicallogs 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 forguidelines onplanning an archive schedule. Refer to page 3-59
foran explanation of what happens if the logical log files become full during
an archive.

TAPEBLK and TAPESIZE

Verifythat the current block size and tape size are appropriate for the device
specified.The block size of the logical log tape device is specified as TAPEBLK.
The tape size is specified asTAPESIZE.
If TAPEDEV is specified as/dev/null, block size and tape size are ignored.
SpecifyTAPEBLK as the largest block size permitted by your tape device.
OnLine does not check the tape device when you specify the block size.
Verifythat the TAPEDEV tape device can read the block size that you specify.
If not, you cannot restore the tape.
SpecifyTAPESIZE 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 asTAPEDEV in the configuration file.
You can change the value ofTAPEDEV 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 ofTAPEDEV as a symbolic link, enabling you to
switchbetween more than one tape device without changing the pathname.
Important: Anytime you change the physical characteristics of the tape device, you
mustcreate a level-0 archive. Otherwise, you might be unable to restore the complete
setof tapes. OnLine cannot switch tape devices during a restore. OnLine will expect
allarchive tapes to have the same block size and tape size as were specified at the time
of the most recent level-0 archive.