Date: Tue, 13 Oct 1998 22:59:24 -0700 From: Don Lewis <Don.Lewis@tsc.tdk.com> To: "Justin T. Gibbs" <gibbs@plutotech.com>, Don Lewis <Don.Lewis@tsc.tdk.com> Cc: Terry Lambert <tlambert@primenet.com>, freebsd-fs@FreeBSD.ORG, freebsd-scsi@FreeBSD.ORG Subject: Re: filesystem safety and SCSI disk write caching Message-ID: <199810140559.WAA17612@salsa.gv.tsc.tdk.com> In-Reply-To: "Justin T. Gibbs" <gibbs@plutotech.com> "Re: filesystem safety and SCSI disk write caching" (Oct 13, 11:16pm)
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On Oct 13, 11:16pm, "Justin T. Gibbs" wrote: } Subject: Re: filesystem safety and SCSI disk write caching } >} 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. If that's the reason for the problem that I saw, then the UPS the system was plugged into wasn't sufficient to prevent the problem. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-fs" in the body of the message
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