Date: Tue, 5 Mar 2002 10:36:06 -0500 From: Brian T.Schellenberger <bts@babbleon.org> To: Burhan Nazir <burhan@blueyonder.co.uk>, Brett Glass <brett@lariat.org> Cc: questions@FreeBSD.ORG Subject: Re: Softupdates on root in 4.5-RELEASE Message-ID: <20020305153606.E096FBA03@i8k.babbleon.org> In-Reply-To: <20020305152447.GA25206@swansea.cableinet.net> References: <200203051451.HAA04559@lariat.org> <20020305152447.GA25206@swansea.cableinet.net>
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On Tuesday 05 March 2002 10:24 am, Burhan Nazir wrote:
> Softupdates will not write any data immediatly to the disk. I believe
> it is about 30 seconds b4 any data actually gets wriiten. This enhances
> disk write speed for certain types of operations. However, there is a
> small risk of data loss/coruption if the machine looses power b4 any data
> was written. For that reason, ppl believe that it is not a good idea to
> have softupdates on the system critical root partition
I think it's more a matter of avoiding it on partitions that are likely to be
rather full and fairly small, since the delay in processing deletes means
that you effectively lose a certain amount of disk space due to processing
time.
Thus, if you
rm /bit/honking/directory/*
operation-that-write-to-disk
you can easily run out of disk space as the second operation starts writing
long before the first operation actually returns space to the system.
I personally make the root partition larger and enable soft-updates but
disable write-caching. This seems much safer than the system default way of
doing things to me, but with nearly equal performance.
>
> Brett Glass wrote:
> >Just noticed that the default, in 4.5-RELEASE, is to install
> >softupdates on all partitions EXCEPT root. Is this an oversight,
> >or is there a reason why this is the default setting?
> >
> >--Brett Glass
> >
> >To Unsubscribe: send mail to majordomo@FreeBSD.org
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>
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--
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