From: Lucas Carey (lcarey@odd.bio.sunysb.edu)
Date: Thu Jul 25 2002 - 10:54:58 EDT
Hi all,
I'm reading the AdvFS book and I'm a little confused as to the relation
between the Frag File (sec 4.2) and the defragment command (sec 4.8).
Disabling the frag file should increase I/O performance at the expense
of disk space, presumably by not keeping trak of fragmented files.
Defragmenting a domain should increase I/O while at the same time
increasing free disk space by consolidating files. How does defragment
work on a domain without an active frag file?
In an environment where disk space is cheap it seems that I would
benifit by turning off the frag file.
I was wondering if people had any thoughts on forcing mail spool files
to do synchronous I/O. (chfile -l /var/spool/mail/*). Sendmail(8.12)
averages under 50msgs/day for a half dozen users, so the decrease in
performance isn't really an issue.
-Lucas
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