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From: "Allen Smith" <easmith@beatrice.rutgers.edu>
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Date: Mon, 8 Jun 1998 23:35:51 -0400
In-Reply-To: Eivind Eklund <eivind@yes.no>   "Re: Newbie 3 questions." (Jun  8,  2:33pm)
References: <199806080349.UAA29145@grebe.Stanford.EDU> 
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To: Eivind Eklund <eivind@yes.no>
Subject: Re: Newbie 3 questions.
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On Jun 8,  2:33pm, Eivind Eklund (possibly) wrote:
> ... and (as John well knows) it can be tuned to run an async policy
> similar to the one in Linux.  Which policy you run is a tradeoff
> between the security of synchronous metadata updates (you get the
> guarantees that you don't get data crossing over from file to file
> during crashes, that directories don't get totally screwed up, etc) vs
> speed in massive manipulation of the filesystem (large amounts of
> renames, creation of lots of small files, etc).  The default policy is
> the safest of these.

Is async necessary/desirable for an MFS, or is it automatic? From the
4.4BSD book, I know that the 4.4BSD MFS is built just like a FFS, only
using pageable memory space instead of filesystem space.

	Thanks,

	-Allen

P.S. If it isn't automatically async, I might see if I can patch
things so that it is. Somebody else doing this would be preferable,
however.

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