Path: utzoo!utgpu!news-server.csri.toronto.edu!bonnie.concordia.ca!uunet!olivea!mintaka!mintaka.lcs.mit.edu!kstailey
From: kstailey@geech.ai.mit.edu (Kenneth Stailey)
Newsgroups: comp.unix.aix
Subject: changing AIX 3.1 JFS block sizes
Message-ID: <KSTAILEY.91Jan10192713@geech.ai.mit.edu>
Date: 11 Jan 91 03:27:13 GMT
Sender: daemon@mintaka.lcs.mit.edu (Lucifer Maleficius)
Distribution: comp
Organization: /home/fsg/kstailey/.organization
Lines: 13

I would like to try using filesystems with 8K blocks, but I can't seem
to find anything about this in info explorer.

The file /usr/include/jfs/fsparam.h contains a line that goes:

#define BSIZE           4096    /* size of file system block (bytes) */

suggesting that it is hard-coded, but the the "Tested Mettle" column
of _UNIX Review_ shows performance stats for 512 1K 2K & 8K bytes per
block file systems.

How do you make an 8K filesystem?  Can it be done without having the
source code to JFS?