Specifications
Page B-5Read-Ahead and Write Buffering
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).
B.4FINAL 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 main system 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.
PDI-00172-10, Rev. A03