Date: Fri, 09 Oct 1998 09:42:19 +0930 (CST) From: "Daniel O'Connor" <doconnor@gsoft.com.au> To: "David E. Cross" <crossd@void.cs.rpi.edu> Cc: freebsd-current@FreeBSD.ORG, toasty@home.dragondata.com, Marius.Bendiksen@scancall.no, Mike Smith <mike@smith.net.au>, Terry Lambert <tlambert@primenet.com> Subject: Re: CDROM as system disk Message-ID: <XFMail.981009094219.doconnor@gsoft.com.au> In-Reply-To: <Pine.SGI.4.04.9810081555490.1189-100000@void.cs.rpi.edu>
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On 08-Oct-98 David E. Cross wrote: > > > Many drives don't offer any standard way of disabling the spindown; > > > you're basically stuck with it. > > I thought you could avoid spindown by reading the thing... >^). > Slight problem, disk caching. If you are going to ping the drive every N > time units as a 'keep-alive', those blocks will very quickly get cached; > unless you devise some clever algorithm that will always ensure that you > get a block not in the cache (consider the cache could me a megabyte or > more in size, and this gets tricky) Err.. pick a random block and read it? OK, not terribly good for the health of the drive, but neither is keeping the drive spinning 100% of the time... --------------------------------------------------------------------- |Daniel O'Connor software and network engineer for Genesis Software | |http://www.gsoft.com.au | |The nice thing about standards is that there are so many of them to| |choose from. -- Andrew Tanenbaum | --------------------------------------------------------------------- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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