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Date:      Fri, 21 Sep 2001 18:54:11 +0100
From:      j mckitrick <jcm@FreeBSD-uk.eu.org>
To:        Matt Dillon <dillon@earth.backplane.com>
Cc:        Mike Meyer <mwm@mired.org>, "Daniel O'Connor" <doconnor@gsoft.com.au>, Kevin Oberman <oberman@es.net>, stable@freebsd.org
Subject:   Re: RE: hw.ata.wc && hw.ata.tags && softupdates short question
Message-ID:  <20010921185411.C81649@dogma.freebsd-uk.eu.org>
In-Reply-To: <200109211736.f8LHaGO71153@earth.backplane.com>; from dillon@earth.backplane.com on Fri, Sep 21, 2001 at 10:36:16AM -0700
References:  <XFMail.20010921121832.doconnor@gsoft.com.au> <200109210329.f8L3TGR30860@ptavv.es.net> <20010920211704.C7820@gateway.bogus> <15274.48864.994229.51687@guru.mired.org> <200109210549.f8L5n6r67664@earth.backplane.com> <20010921122805.A78591@dogma.freebsd-uk.eu.org> <200109211726.f8LHQ3h70907@earth.backplane.com> <20010921183212.A81649@dogma.freebsd-uk.eu.org> <200109211736.f8LHaGO71153@earth.backplane.com>

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|     You can choose one or the other, neither, or both.   I typically run my
|     laptop with softupdates turned on and write caching also turned on.  A
|     somewhat safer configuration would be softupdates turned off and write
|     caching turned on, but not because softupdates and write caching might
|     conflict.  They don't.  Only because softupdates itself delays meta-data
|     I/O and more work can be lost if a crash occurs then otherwise.

Without knowing the details, I was just trying to sort out the tradeoffs of
each option.  We've been told softupdates is reliable and makes UFS about as
fast as Linux ext2fs.  We've been told write caching turned OFF causes a
huge performance hit, but ON can cause data loss.  And we've also heard that
some controllers tell you WC is off even when it is still on.  When you put
it all together, it makes quite an interesting fuzzy-logic truth table.  :-)



jm
-- 
My other computer is your windows box.

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