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1992-11-04
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51 lines
___________________________________________________________________________
STAC FAX STAC FAX
Title: Performance Differences Between Stacker Software and Coprocessor
Versions (AT/16 and MC/16).
STACKER NOTE TEC010 - 2/20/92 STAC FAX Index #2502
___________________________________________________________________________
Background.
Stacker's software is supplemented and enhanced by the coprocessor card.
The Stacker coprocessor card yields the highest compression of data, the
smallest device driver and the fastest I/O.
What performance increases will I see with the coprocessor?
1. Hardware compression offers as much as 10-20% more disk space;
2. Disk reads and writes are 5-15% faster. This higher performance
is especially apparent on slower 8088/8086 and 80286 machines.
3. The device driver memory requirements with the Stacker coprocessor card
are as little as 14k vs. a minimum of 26k for the software version.
What if the coprocessor stops working?
If the coprocessor card does not respond to the Stacker device
driver when the system starts up, Stacker will run in the
software mode and produce the following message: <coprocessor not
functioning -- invoking software driver>. This means that Stacker
is fully operational, only it is running without the benefits of
the card. For AT/16 trouble shooting guidelines see STACKER NOTE
Tec008 (STAC FAX index #2001), "Stacker Coprocessor Card Installation
Checklist".
Is is difficult to upgrade to the coprocessor from the software version?
Upgrading from the software to the coprocessor version does not
require that you re-stack your drives. However, only those files
written to the drive with the coprocessor benefit from the higher
compression. With Stacker 2.0, all the files can be recompressed
by the Stacker coprocessor by running Stacker's SDEFRAG disk optimizer
with the /R parameter. For example, to recompress Stacker drive C:
type: SDEFRAG /R C: <ENTER>
___________________________________________________________________________
Copyright 1992, Stac Electronics STAC FAX (619) 431-6712