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Date:	Sun, 8 Jun 2003 14:13:38 PDT7
From:	"Steven Levine" <steve53@earthlink.net >
Reply-To:	scoug-help@scoug.com
To:	scoug-help@scoug.com
Subject:	SCOUG-Help: HDD cache size choice with OS/2

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In <3EE31726.12355.CE5F0DF@localhost>, on 06/08/03
at 10:58 AM, "Dave Watson" said:

>This is an old thread, but my recollection is we were wondering if cache
>was operating system dependent. Bigger cache probably improves things
>in some situations. But does it have different effects on different
>operating systems, especially detriments to OS2?

The effect of a cache is dependent on lot of factors. Peter covered most
of them. Keep in mind that a cache is only effective if it contains the
data that needed at a moment in time. In the case of sequential reads, of
a large file the cache that does not do lookahead reads is not going
improve performance much, if at all. If the file access is essentially
randon, lookahead reads might actually degrade performance. The drive
might be busy doing a lookahead read and this will delay the random read.

Steven

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"Steven Levine" MR2/ICE 2.37 #10183 Warp4/FP15/14.085_W4
www.scoug.com irc.webbnet.org #scoug (Wed 7pm PST)
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