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Date:      Mon, 15 May 2000 13:12:02 +0200
From:      Sheldon Hearn <sheldonh@uunet.co.za>
To:        Lauri Laupmaa <mauri@aripaev.ee>
Cc:        "'stable@freebsd.org'" <stable@FreeBSD.ORG>
Subject:   Re: turning softupdates on / 
Message-ID:  <15685.958389122@axl.ops.uunet.co.za>
In-Reply-To: Your message of "Sun, 14 May 2000 20:13:25 %2B0200." <8E67E032AD23D4118F740050042F21F713@lant.mbp.ee> 

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On Sun, 14 May 2000 20:13:25 +0200, Lauri Laupmaa wrote:

> Some time ago I was able to tunefs -n enable /dev/rootfs + fast reset
> button, but now with 4.0 it does not work...

There was a bug in FreeBSD 4.0-RELEASE's tunefs (since fixed in
4.0-STABLE), which prevented the use of tunefs on filesystems mounted
for writing.  If you track 4.0_STABLE, this problem should go away.  If
not, you'll have to boot off a floppy to tune your root filesystem.

Having said that, I personally discourage people from enabling soft
updates on the root filesystem.  Very few folks do enough writing to the
root filesystem to justify this.  The two cases where people think they
need this are

	1) /tmp is not its own filesystem

	   Solution: mount /tmp in mfs(8) or an md (undocumented).

	2) The filesystem is not partitioned; there is only the root
	   filesystem.

	   Solution: usually, don't do this. :-)

In the second case, wanting to enable soft updates on the root
filesystem makes sense.  However, in the case of a normal, partitioned
configuration, the root filesystem is usually small and can "run out of
space" during a ``make world''.

Ciao,
Sheldon.


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