Owner`s manual
Page 9Eagle/Roadrunner Configuration Information
This would set up 100KB of write buffering for the DSK devices and 100KB of write
buffering for the SUB device. All three drives would have their write buffers flushed
every minute (or sooner if the drives are not busy with read requests).
5.0FINAL NOTES
Both read-ahead and write buffering schemes used on the Roadrunner hardware
dramatically improve system performance in our lab tests. Both schemes are fine tuned
for both the 68030/040 processor and RISC SCSI controller and do not take cycles
away from AMOS like other commercially available disk optimization software.
Although our lab tests attempt to simulate the "real world" of user applications, they
probably use the resources of the Roadrunner CPU and SCSI sub-system completely
differently than your application does, therefore we highly recommend you experiment
with both cache and write buffer sizes, read-ahead blocks and flush periods on an
installed system to find the best possible combination for that system.
5.1Controlling Write Buffering (Caching)
Since the release of
UPS Monitor Software
version 1.3(174), the user can control the
turning on and off of the write buffering feature. Earlier Eagle systems must use the
serial UPS software to control write buffering, while the AM-4000 and Super Eagle
systems can use either the UPS switch contact port and/or the serial UPS software.
The UPS monitor setup is selected from menu option "W" for Write Cache Control, and
the user can then select either option "A" or "B".
The serial UPS software is designed to work with the Toshiba UPS products sold by
Alpha Microsystems.
PDI-03500-50, Rev. B00