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July 2021, Week 4

HP3000-L@RAVEN.UTC.EDU
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Subject:
Re: [EXT]: Contact information for LUND Performance Solutions
From:
Stan Sieler <[log in to unmask]>
Reply To:
Stan Sieler <[log in to unmask]>
Date:
Tue, 27 Jul 2021 22:57:09 -0700
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Mark writes:

> Is defrag even needed on MPE/ox systems?  I heard not.
>

For disk allocation purposes, generally not.  I.e., you usually won't "run
out of disk space" just because your system is fragmented, as could happen
on MPE V.

But, as Craig pointed out: yes.  A highly fragmented file uses many entries
in the Extent B-Tree table ...
if you run out of them, you crash.

Our BFREE and De-Frag/iX are two products that can help make more Extent
B-Tree entries available.

Stan

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