Date: Tue, 13 Oct 1998 23:16:27 -0600 From: "Justin T. Gibbs" <gibbs@plutotech.com> To: Don Lewis <Don.Lewis@tsc.tdk.com> Cc: "Justin T. Gibbs" <gibbs@plutotech.com>, Terry Lambert <tlambert@primenet.com>, freebsd-fs@FreeBSD.ORG, freebsd-scsi@FreeBSD.ORG Subject: Re: filesystem safety and SCSI disk write caching Message-ID: <199810140523.XAA15206@pluto.plutotech.com> In-Reply-To: Your message of "Tue, 13 Oct 1998 21:39:50 PDT." <199810140439.VAA17463@salsa.gv.tsc.tdk.com>
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>} This doesn't follow. If the cache is disabled, it doesn't matter if >} the drive loses power due to hitting the reset button. We already >} know that losing power on a drive that cached data will not work. > >I didn't hear the sound of any mechanical things spinning down. The >machine just started going through its boot sequence. The drive will reinitialize to the 'power on state' if the power fluctuates into a zone that might invalidate it's run-time state. It doesn't take a very long spike for the drive's power-glitch sensor to go off. In this case, dropping cached contents on the floor is much safer than attempting to continue from an unknown state. -- Justin To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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