Contents of the CHANGE.DOC file
Why would you, the customer, want to change the interleave value? When the
computer manufacturer initialized the computer system, there was no tape drive
installed as there is now. The tape drive, when operating, uses the computer's
memory at almost the exact same time as the hard disk does. This causes the
computer to not be able to supply or accept data from the hard disk as fast as
it would when the tape drive is not running. (Note: you may or may not have a
tape drive installed, depending on where you got this program).
Note: The tape has to actually be moving before it slows down your system,
An easy way to see if you need to adjust your interleave is by running your
tape backup program, and performing an IMAGE BACKUP. Listen to the tape drive
as the program runs. If the tape runs for a long time before stopping, your
computer is probably just fine the way it is. If the drive stops for a moment
every 5 to 15 seconds, you probably need to change the interleave.
By increasing the interleave from the factory value (usually 2, or 3) your
computer will be able to handle the requirements of having two high-speed
devices being used at the same time, instead of just one.
Our tests have shown that a good value for interleave is FIVE. This should
give you nearly identical performance with your other programs (spreadsheets,
BASIC, and so on), but will help the tape drive to receive and transmit in a
smooth, streaming manner.
If you want to select a different interleave value, you specify it on the
command line, such as IAU 3 . Permissable values are from 1 to 15.
Typical values are from 2 to 6.
This interleave-changing program is specially designed so that none of the data
you have on your disk will be altered during the operation. All of the
programs that we had seen wipe out the data on the disk whenever the interleave
value is changed. That's why we wrote this program for our customers.
Please be sure to read the WARNING MESSAGE before you start the re-interleave