Subject: Re: major hier(7) overhauls?
To: NetBSD Userlevel Technical Discussion List <firstname.lastname@example.org>
From: Greg A. Woods <email@example.com>
Date: 12/23/1998 13:41:26
[ On Wed, December 23, 1998 at 19:50:28 (+1100), Giles Lean wrote: ]
> Subject: Re: major hier(7) overhauls?
> On Sun, 20 Dec 1998 01:23:57 -0500 (EST) Greg A. Woods wrote:
> > As some of you know my favourite "major overhaul" would be to eliminate
> > /usr and move the system entirely back into one self-consistent,
> > single-level, hierarchy. We no longer need to split the system over
> > separate disk packs, not because of size, not because of speed, not even
> > because of reliability and robustness.
> i386 BIOS boot limitations?
I guess it depends on exactly what disks and BIOS you have, but I've no
problem getting a 500MB partition on a 4GB SCSI disk to boot
(1024*255*63=16450560 sectors). Even on a 1GB disk it should still work
(1024*63*32=2064384 sectors), and so far as I know there are no major
issues with disks <1GB. Maybe I'm fooling myself and have just been
lucky because /boot is still very early on the disk -- I don't know.
Either way I can hardly wait for those OpenBIOS folks to get going! ;-)
(and I do hope they use the OpenFirmware specs, but it doesn't look like
they're going to....)
That 500MB is extreme over-kill too. A combined / and /usr, including
X11, is only ~160MB, and without X11 is only about half that, at least
on an i386. I am putting /usr/local and /usr/pkg on a separate
filesystem (and separate spindle! ;-) though (and combining them because
I've no idea how the split will work out in the long term).
My -current system looks like this now (3 4.5GB disks) (X11 is only on /
so far, not /altroot):
12:59  $ df -k
Filesystem 1K-blocks Used Avail Capacity Mounted on
/dev/sd0a 490591 154284 311777 33% /
/dev/sd0e 490591 1560 464501 0% /var
/dev/sd1e 490591 1 466060 0% /tmp
/dev/sd1a 490591 81121 384940 17% /altroot
/dev/sd0f 2834732 979599 1713396 36% /cvs
/dev/sd1f 2834732 45760 2647235 1% /opt
/dev/sd2h 3815222 280437 3344023 7% /work
Yes, I'm showing off my new toy!
I am wasting a lot of space, but I don't want to have to re-partition
this thing any time soon. I've also put 500MB swap on each disk, so if
I need a wee bit more somewhere I can still juggle things around! ;-)
/altroot is my "quick" recovery scheme (in case -current screws
something up), and where I'll set DESTDIR for testing new builds before
I take them 100% live. Note that having / and /usr on the same
filesytem makes recover even quicker and keeping things in sync even
simpler. The other partitions will be backed up periodically, usually
with incremental dumps, and /home is NFS mounted from my main server.
Now I've got to go get ready to re-build my 1.3.x/i386 machine with
1.3.3 and build a whole lot of packages on it for a client, and then
install 1.3.3 on a sparc for testing in preparation for doing a re-build
and upgrading my main sparc server. Somewhere in there I want to get
1.3.3 and -current on my Multia's, once I've fixed them, and get one
ready to take over firewall/router duty.... I guess it won't all happen
Greg A. Woods
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