Please ignore the From line as far as for whom I am speaking. I am speaking
only for myself.

Basically, what you guys want is a Logical Volume Manager, not a jfs. It's the
LVM that manages disk space. JFS is simply one type of filesystem that can sit
on a logical volume.

There were some efforts on the Linux side on a project called "VPS" that I was
watching with interest a year and a half ago. I've seen no activity on their
mailing list for months, although interested parties could feel free to ask on
vps-devel@acm.uiuc.edu. (Be warned, if you aren't a coder, what they've got
won't be of interest to you...)

Thanks,
David

--
David W. Rankin, Jr. --- DSM UNIX Team
    External Phone (606) 243 1457    Internal 8-545-1457




current-users-owner@NetBSD.ORG on 12/22/97 11:19:06 PM
Please respond to current-users-owner@NetBSD.ORG @ internet
To: bstark@siemens-psc.com @ internet
cc: current-users@NetBSD.ORG @ internet, netbsd-help@NetBSD.ORG @ internet
Subject: RE: JFS - Journaled File System...


On 22-Dec-97 Brian Stark spoke unto us all:
# Has anyone experimented with, or considered adding support for a AIX-style
# Journaled File System in NetBSD?
#
# The reason that I am asking is because I need to increase the size of my
# root partition and increase the size of my swap area, but I see no easy
# way of doing that, short of re-installing NetBSD on my hard drive.
#
# IBM's concepts of a volume groups, logical volumes, etc..., suddenly seem
# to make a lot of sense...
#

It would be nice if ffs supported some sort of logical volume group management
like AIX does.  I tend to wonder how that works in a situation where a drive
dies though.. Do bits and pieces of filesystems get wasted?

I do NOT like the swap system on AIX..  if you want increased swap under BSD,
add another swap partition..  But I do agree it would be really nice if you
could expand /root or /usr or whatever if need be.  Even if for now it means
just padding it with empty space between them..  For example I could:

0a = /root  0b = swap  0e = /usr

make swap overly large..  If usr runs into trouble, donate some swap to it on
the fly..  You could pad the partitions with swap between them..

At least until we had a more dynamic allocation like AIX.  I do NOT like jfs as
a system however.. it seems to be alot slower than FFS, and lacks some of the
features of ffs I have grown to love.  Not sure if a mix of the two would be
possible.

---
Tim Rightnour    -  root@garbled.futureone.com
http://www.zynetwc.com/~garbled/garbled.html