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Date:      Wed, 14 Mar 2001 07:05:20 -0700
From:      "Justin T. Gibbs" <gibbs@scsiguy.com>
To:        Alfred Perlstein <bright@wintelcom.net>
Cc:        Helge Oldach <Helge.Oldach@de.origin-it.com>, oberman@es.net, sos@freebsd.dk, mobile@FreeBSD.ORG, stable@FreeBSD.ORG
Subject:   Re: Disk I/O problem in 4.3-BETA 
Message-ID:  <200103141405.f2EE5Ks71827@aslan.scsiguy.com>
In-Reply-To: Your message of "Tue, 13 Mar 2001 00:58:11 PST." <20010313005811.J29888@fw.wintelcom.net> 

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>First off, some disk caches are getting > 10megs, that's a lot
>of potnetial seeking after loosing power depending on the cache
>contents...

I've heard that most modern drives reserve a contiguous area of the
disk the size of the cache near where the heads park to dump any
cache contents on power outage.  This avoids most if not all seeking.
When the disk powers up again, the reserve track is read and the
transactions are written to the correct locations.  Any disk that does
this should be safe to use with write caching enabled.

--
Justin


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