Re: >137GB IDE support, Re: 5.0.7 Fresh Installion with Merge 5

From: Bela Lubkin (belal_at_sco.com)
Date: 09/25/03 

Date: 25 Sep 2003 13:15:43 -0400

Me, talking with Bob Bailin,

Bela>> "Large Filesystem Performance Supplement": OSR507 only (does not
Bela>> require UP1); increases HTFS performance on large filesystems

Bela>>>> 7. Large Filesystem Performance Supplement

Bob>>> Also not yet officially announced or released?

Bela>> Right. Part of the above CD, which is now in manufacturing; will be on
Bela>> the web site as soon as those gears finish grinding.

Bob> Hopefully when this is released there will be some hard and fast definition
Bob> of "large" (unlike the confusion many years ago with a similar supplement
Bob> for 5.0.2), and whether installing it on a "not large" system will have any
Bob> adverse effects.

"Large Filesystem Performance Supplement" will not hurt small
filesystems.

Who should install it: everyone who is running a suitable system, i.e.
OSR507.

I have seen it have a remarkable effect on a 10GB filesystem, and a
noticable effect on a 2GB filesystem.

I have seen it have no effect on a system with a 6GB and a 12GB
filesystem.

The supplement's main effect is on write speed. HTFS write performance
degrades as it gets farther into a filesystem; or at least it used to.
With the supplement this degradation becomes insignificant. HTFS write
performance also "falls off a cliff" when a filesystem is nearly full;
with the supplement, this effect is greatly reduced.

Bob> Thanks for the detailed information. I wish/hope that these details will be
Bob> included in the various README files on the SCO Openserver ftp site,
Bob> which haven't been properly updated in weeks. Specifically, there's no
Bob> indication which SLS and driver files are already included in or
Bob> superceded by MP1 & UP1. A TA summarizing the installation order that
Bob> you posted earlier is probably also warranted.

I will suggest this to the people that write TAs...

>Bela<

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