10-10-2002
I answered part of your question on the other post for the same topic.
Here is a site that may help you tremendously. Look in chapter 4.
http://www.redbooks.ibm.com/SG245139/5139fm.htm
For most OSs, I believe I can say that 4mb is the default size for OS filesystems. To see your block size, you should be able to run a command on the volumes/slices. On HPUX it is something like "vgdisplay -v /dev/vg01/lvol". The information at the top will show it. Do a "man -k block" to find your command in your man pages.
You can set the blocksize when you create new filesystems. It can't be changed once you have created a volume/filesystem. You would have to backup the data and destroy and recreate the filesystem to change the block size.
You will have to create new filesystems to migrate data to or backup and recreate the ones you have.
Last edited by Kelam_Magnus; 10-10-2002 at 04:52 PM..
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GETBSIZE(3) BSD Library Functions Manual GETBSIZE(3)
NAME
getbsize -- get user block size
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <stdlib.h>
char *
getbsize(int *headerlenp, long *blocksizep);
DESCRIPTION
The getbsize() function determines the user's preferred block size based on the value of the ``BLOCKSIZE'' environment variable; see
environ(7) for details on its use and format.
The getbsize() function returns a pointer to a null-terminated string describing the block size, something like ``1K-blocks''. The memory
referenced by headerlenp is filled in with the length of the string (not including the terminating null). The memory referenced by
blocksizep is filled in with block size, in bytes.
If the user's block size is unreasonable, a warning message is written to standard error and the returned information reflects a block size
of 512 bytes.
SEE ALSO
df(1), du(1), ls(1), systat(1), environ(7)
HISTORY
The getbsize() function first appeared in 4.4BSD.
BSD
June 4, 1993 BSD