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Date:      Fri, 08 Jan 1999 11:41:22 +0100
From:      "José Mª Alcaide" <jose@we.lc.ehu.es>
To:        Matthew Dillon <dillon@apollo.backplane.com>
Cc:        freebsd-current@FreeBSD.ORG
Subject:   Re: SOFTUPDATES
Message-ID:  <3695E0D2.2A837D2A@we.lc.ehu.es>
References:  <199901080632.WAA38081@apollo.backplane.com>

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Matthew Dillon wrote:
> 
>     Softupdates basically gives you the advantage of an async mount without
>     any of the risks.  It's actually better then that - it can unwind commits
>     to disk before they occur ( e.g. if you create a temporary file and then
>     delete it very soon after ).  Softupdates basically guarentees disk
>     consistancy in the face of a crash.
> 
>     It's pretty well debugged as it stands -- I'd call it production.  I don't
>     think the problem the person who was posting and calling a softupdates
>     is actually a softupdates problem.  I've been using it solidly for a while
>     and BEST has been using it on their nntp box ( a very heavily loaded box )
>     for a few months.
> 

The main problem I see with softupdates is the lack of information.
I read the tunefs(8) manpage and I found the "-n" option. However,
there is no mention to the need of the SOFTUPDATES kernel option
(I bumped into it while reading LINT).

I think that a little tutorial about what softupdates is, and how
to turn it on, should be very useful for many users (like me :-) ).

-- JMA
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José Mª Alcaide                         | mailto:jose@we.lc.ehu.es
Universidad del País Vasco              | http://www.we.lc.ehu.es/~jose
Dpto. de Electricidad y Electrónica     |
Facultad de Ciencias - Campus de Lejona | Tel.:  +34-946012479
48940 Lejona (Vizcaya) - SPAIN          | Fax:   +34-944858139
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