Date: Wed, 31 Aug 2005 13:39:58 +0200 From: "mdff" <nospam@mgedv.net> To: <freebsd-hackers@freebsd.org> Subject: RE: IBM Active Protection System Approach Message-ID: <20050831113943.C4974186800@mgedv.at> In-Reply-To: <20050824010022.GA19515@panix.com>
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> what would be the best approach to implement aps on FreeBSD? > We have to poll the device for information quiet often to detect a possible shock early enough to park disk drive heads. > Would an daemon be sufficient for that? Reaction time? What about an kernel thread? sorry for being that late on this, but just a thought: shouldn't this be an issue for the hdd-vendors to put this kind of protection algorithm directly into their hdd-controller-firmware? also, the accel.-detection could be on the hdd, not inside the nb. couldn't this save time and programming efforts for parking, flushing or even stopping the heads/plates? what about some kind of electronic "brake" that immed. stops the rotating plates in case of detection of such an event? cu... ps: just reply to the list, i'm on it!
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