Does the file system need reorganization under HP-UX?
Paul Hite
paul at prcrs.UUCP
Wed Nov 14 05:00:10 AEST 1990
In article <5526 at uafhp.uark.edu>, tn03 at uafhcx.uucp (Tn3270 access) writes:
>
> I have been asked to design a program to reorganize the file system under HP-UX
> because there is concern that performance may suffer if data gets too far
> scattered across the disk? Is this true.
>
HP-UX (in it's current incarnation on the 300's and 800's) uses a modified
version of the Berkeley file system. In theory the cylinder group stuff tends
to keep the data localized and thus periodic re-orgs are not needed. If a
file system is allowed to become too full, the last files written can be
scattered. There is a min-free parameter set to 10%. If this is respected,
the file system can't become too full. Anyway that what I have read and we
have never re-orged our file systems.
If re-orging a file system was necessary, I probably wouldn't trust a
program that attempted this "in place". Rather I would just dump the files
to tape, rebuild the file system, and restore the files. If I did use an
"in-place" type program, I would still want a backup. So the re-org
program would have to be faster than reloading the files to be a win.
A program to reorg a file system is a job for a real guru. I doubt that
either of us has any business attempting such a feat. But if you do pursue
this, you may want to post any further questions to comp.sys.hp. That's
where the HP-UX gurus hang out.
Paul Hite PRC Realty Systems McLean,Va uunet!prcrs!paul (703) 556-2243
You can't tell which way the train went by studying its tracks.
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