parameters on CDC Wren IV, Adaptec 1542b
Larry Snyder
larry at nstar.uucp
Sun Nov 4 11:49:34 AEST 1990
bill at unixland.uucp (Bill Heiser) writes:
>I ran the SCSICNTL.EXE program to examine my CDC Wren IV (hooked up
>to an Adaptec 1542b), and have some questions about the appropriate
>settings. The system is running Esix Rev D (SYSVR3 Unix).
>Parameters:
> Defaults Current Options
>Disable Correction enabled enabled
>Transfer on error enabled enabled
>post error disabled disabled
>early error correction disabled disabled
>read continuous disabled disabled
>transfer block disabled disabled
>auto read allocation disabled disabled
>auto write allocation disabled disabled
>retry count 27 27 1-255
>buffer full ratio 4 4 0-255
>buffer empty ratio 4 4 0-255
>[a bunch of stuff about tracks/sectors per zone skipped for now]
>write index enable disabled disabled
>cache enable disabled disabled
>What are the best settings to have on these parameters in my application?
what you need to do is to change one item at a time - then
bench the system, change another - then bench, etc..
I have cache enabled (made a 10% difference) and changed the
buffer ratios from 4 to 16 (made a + difference on large disk IO,
and - on small; but since most of mine is large - I changed it)..
>Thanks in advance...
>Bill
>--
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> bill at unixland.uucp, bill%unixland.uucp at world.std.com
> Public Access Unix - Esix SYSVR3 - (508) 655-3848
>other: heiser at world.std.com Public Access Unix (617) 739-9753
--
Larry Snyder, Northern Star Communications, Notre Dame, IN USA
{larry at nstar, uunet!sco!romed!nstar!larry, nstar%larry at iuvax.cs.indiana.edu}
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