Date: Thu, 17 Jun 1999 12:07:07 -0500 (EST) From: Alfred Perlstein <bright@rush.net> To: "Chad R. Larson" <chad@DCFinc.com> Cc: Mike Smith <mike@smith.net.au>, jedgar@fxp.org, sec@42.org, des@flood.ping.uio.no, freebsd-stable@FreeBSD.ORG Subject: Re: / not properly unmounted ? Message-ID: <Pine.BSF.3.96.990617120558.14320m-100000@cygnus.rush.net> In-Reply-To: <199906171700.KAA29113@freeway.dcfinc.com>
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On Thu, 17 Jun 1999, Chad R. Larson wrote: > As I recall, Mike Smith wrote: > > > The first complaint was that the power-down was catching disk stuff > > > still in cache. Setting an arbitrary delay on the way down seems > > > inefficient at best, and possibly not sufficient. How about instead > > > just making sure all buffers are flushed before the power-down is > > > allowed to to occur, however long that takes? > > > > You can't do this, because it's the _disk_ that holds the cached data. > > Ok, I missed something in the original post? He's using some kind > of caching (or RAID) controller? > no, some drives have write caching, if you suddenly cut power, they don't have enough charge left to write out the data in the cache. -Alfred To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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