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Date:      Mon, 15 Jun 1998 22:24:21 -0700
From:      David Greenman <dg@root.com>
To:        greeves <sysadmin@mfn.org>
Cc:        "freebsd-questions@FreeBSD.org" <freebsd-questions@FreeBSD.ORG>, "hua@nease.net" <hua@nease.net>, "'Thomas David Rivers'" <rivers@dignus.com>
Subject:   Re: Is there any "race condition" in FFS? 
Message-ID:  <199806160524.WAA15084@implode.root.com>
In-Reply-To: Your message of "Mon, 15 Jun 1998 21:44:41 CDT." <01BD98A6.CE8815E0@greeves.mfn.org> 

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>OK, now you've got me nervous!  Here I am about to begin turning mail
>services here over to FBSD and Popper et al. (from NT with IMS - a really
>great mail server whose mail flaw is running on NT ;-)  and you send me
>word of th "David Rivers Daily Memorial Panic"???   
>
>Is this phenomenon associated with any particular set of conditions
>which I can avoid?  This is *very* serious from my perspective: let's
>face it Email is the *one* thing that will fire up an otherwise brain-dead
>user to action!  I certainly don't need 5000 daily complaints from angry 
>users and frustrated bosses :)
>
>Should I be sticking with our NT mail servers for now?

   Dave has had problems since nearly the very beginning of FreeBSD. If we
were able to reproduce the problem, then we'd likely have fixed it. I believe
there is a real problem, but it seems to show up in only about 1 in 200,000
systems. It is extremely unlikely that you'll ever see it. I think the problem
is sensitive to filesystem layout and possibly some kind of race condition,
but that's just a guess based on data that Dave has provided.
   We successfully handle several hundred thousand emails/day through the
project's mail server, so if that's not good enough, then I don't really know
what is.

-DG

David Greenman
Co-founder/Principal Architect, The FreeBSD Project

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