Date: Mon, 9 Apr 2007 14:56:24 -0500 From: "Rick C. Petty" <rick-freebsd@kiwi-computer.com> To: Garrett Cooper <youshi10@u.washington.edu> Cc: freebsd-hackers@freebsd.org Subject: Re: Discovering list of open files from "kernel level" without using utils like lsof Message-ID: <20070409195624.GA87746@keira.kiwi-computer.com> In-Reply-To: <46192EFC.6030906@u.washington.edu> References: <46192EFC.6030906@u.washington.edu>
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On Sun, Apr 08, 2007 at 11:05:48AM -0700, Garrett Cooper wrote: > I'm trying to see if there's a simple tool that I could code in C/C++ > if necessary to spin down disks automatically to save power and disk > life. Plus, I think that lsof actually would probe the devices and 'wake > them up' instead of keeping them as-is. However, I could be wrong so if > I am please let me know. I read somewhere once that keeping disks spinning makes them last 10x longer. Personally, I've seen more disk failures on workstations which are power-cycled regularly than on systems which are always running. I've also seen disks work just fine while powered that just plain quit immediately after a power cycle. So you may save power by spinning the disks down, but I doubt you're saving disk life (unless they're powered down for weeks at a time). -- Rick C. Petty
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