Path: utzoo!attcan!uunet!lll-winken!lll-ncis!helios.ee.lbl.gov!pasteur!agate!labrea!decwrl!hplabs!hpfcdc!hpfcmr!hpfcse!hpuepta!jp
From: jp@hpuepta.UUCP (John Pezzano)
Newsgroups: comp.sys.hp
Subject: Re: Berkeley file system tuning
Message-ID: <32870001@hpuepta.UUCP>
Date: 12 Jan 89 20:11:00 GMT
References: <310@sagpd1.UUCP>
Organization: HP El Paso Sales Office
Lines: 27

>My second question is: how much effect does changing the block and
>fragment size have? The manual says that if you use an 8K block and
>fragment size it speeds up the file system but wastes space. Does
>anyone have a quantitative feel of how much the tradeoff is?
>
>Bruce Anderson  -  Scientific Atlanta, Government Products Division

I created a single large file system using Section 13 on a HP7937
(571MB) disc and 8K/8K block/fragment. It used about 20% more disc space
than the standard configuration. I would recommend a single file system
on the root disc for convenience. This is my personal feeling but I
found the sectioning of the root disc is just not worth the effort.
Sectioning of other discs can be beneficial. HP gives you the choice.

Some info:

Section 13 allows a boot area and good sized swap. Section 13 is only
supported in Rev 3.0 of HP-UX.

You cannot create a Section 13 with 8K/8K at install time. I used two
discs, installing on one, then newfs'ing the second with 8K/8K, copying
the root area and files to the second disc, booting off the second after
switching addresses and reinitializing the original.

You can email me for more info. hplabs!hpfcse!hpuepta!jp

JohnP