Date: Sun, 09 Jul 2000 23:51:55 GMT From: Salvo Bartolotta <bartequi@inwind.it> To: "David J. Kanter" <djkanter@northwestern.edu> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: Softupdates question Message-ID: <20000709.23515500@bartequi.ottodomain.org> In-Reply-To: <20000709005612.A89313@localhost.localdomain> References: <20000709005612.A89313@localhost.localdomain>
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>>>>>>>>>>>>>>>>>> Original Message <<<<<<<<<<<<<<<<<<
On 7/9/00, 6:56:12 AM, "David J. Kanter" <djkanter@northwestern.edu>=20
wrote regarding Softupdates question:
> I'm upgrading to 4.0 and the softupdates option looks particularly
> attractive. I'd like to use it because of power outages.
> My question is: Which filesystem(s) should softupdate be applied to?=20
All of
> them? Or, are some better than others? What about the root filesystem?=
=20
If
> so, is it possible to umount all filesystems and run the tunefs=20
program?
> --
> David Kanter
> djkanter@northwestern.edu
Dear David Kanter,
If performance is your main concern, you may wish to enable=20
softupdates and the "noatime" option for all filesystems except for=20
"/". This last filesystem ("/") should (normally) be used only with=20
the "noatime" option.
Just my 0.02 Euro to the pot :-)
<MATERIAL FOR FLAME WAR>
Incidentally, I seem to understand that softupdates, with respect to=20
e.g. J.F.S. (Journaling Filesystem), is even better (!). That is, it=20
is quicker, and, in case of problems, you only lose a rather limited=20
amount of data (related to the last 30 seconds or so of system activity)=
.=20
For obscure reasons, softupdates has not received enough=20
/acknowledgements/emphasis/etc., and has been considered as a "minor"=20
substitute for JFS for quite a while ...=20
</MATERIAL FOR FLAME WAR>
UPS devices, however, are cheaper and cheaper, so this should no=20
longer be an issue.=20
Best regards,
Salvo
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