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From: Archie Cobbs <archie@whistle.com>
Message-Id: <199810090447.VAA23251@bubba.whistle.com>
Subject: Re: installworld and softupdates
In-Reply-To: <199810082239.PAA20091@usr06.primenet.com> from Terry Lambert at "Oct 8, 98 10:39:09 pm"
To: tlambert@primenet.com (Terry Lambert)
Date: Thu, 8 Oct 1998 21:47:08 -0700 (PDT)
Cc: thomma@BayNetworks.COM, freebsd-current@FreeBSD.ORG
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Terry Lambert writes:
> > I have a machine whose / partition is 32MB and about 10MB
> > space left.  Softupdates is enabled on / as well as other
> > partitions.
> > 
> > The buildworld completes with a hitch. Then installworld always 
> > fails when updating /sbin with / file system full.  
> > After the failure, when I did df, I saw 9MB left.  
> > 
> > Then I thought that softupdates was delay^H^H^H^H^Hoptimizing the 
> > temporary file space reclaim which install -s (stripping) creates and 
> > deletes very quickly during installworld.
> > 
> > It turned off softupdates and tried installworld. 
> > 
> > Bingo!  It completed.
> > 
> > So be careful when your / is running out and do make world/installworld.
> 
> Disk space held by uncommitted deletes depending on other operations
> is, by definition, not reusable until such time as the operations are
> committed.

Another way of looking at it is this: softupdates breaks the
traditional "contract" (whether it was really a contract or
not is for debate) that when a file removal completes, the
disk space taken by the file is then immediately available
for re-use.

Instead, it is only guaranteed to become available a short
time later in the future.

-Archie

___________________________________________________________________________
Archie Cobbs   *   Whistle Communications, Inc.  *   http://www.whistle.com

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