Date: Wed, 27 Oct 2010 15:04:39 +0200 (CEST) From: Oliver Fromme <olli@lurza.secnetix.de> To: arundel@FreeBSD.ORG (Alexander Best) Cc: Bruce Cran <bruce@cran.org.uk>, Dag-Erling =?iso-8859-15?Q?Sm=F8rgrav?= <des@des.no>, mav@FreeBSD.ORG, Tijl Coosemans <tijl@coosemans.org>, freebsd-hackers@FreeBSD.ORG Subject: Re: Summary: Re: Spin down HDD after disk sync or before power off Message-ID: <201010271304.o9RD4e9Q043179@lurza.secnetix.de> In-Reply-To: <20101027124113.GA6206@freebsd.org>
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Alexander Best wrote: > i just stumbled upon PR 144770, where a somebody seems to have mistaken the > spindown value for minutes instead of seconds. so i really think we should have > this warning in atacontrol! > > +1 from brucec, if i understood him correctly. > > another possibility would be of course changing the spindown value from seconds > to minutes. imo this seems very reasonable, because measuring spindown time in > seconds is too fine grained and not intuitive. just like specifying the > 'shutdown -p XX' delay in microseconds would not be useful. ;) No, please don't. Changing the meaning of the value from seconds to minutes will break people's existing setups. I'm also against printing a warning for values less than 600. If I want to set the value to 300, I don't want to be slapped with a useless warning. Also note that 300 (and even much less) might be perfectly reasonable, depending on the kind of device! As a rule of thumb, the smaller a drive, the better it is optimized for many spin up/down cycles. For example, I've got a portable HDD mp3 player that contains a 1.8" disk. When playing an mp3 file, it spins up every 20 seconds or so, reads 500 KB, then spins down again. In my opinion, this is purely a documentation issue. If it is well-documented that the spindown value is given in seconds, then that should be sufficient. Supporting values like "5m" or "1h" would be fine, as long as a value without a letter still means seconds. Best regards Oliver -- Oliver Fromme, secnetix GmbH & Co. KG, Marktplatz 29, 85567 Grafing b. M. Handelsregister: Registergericht Muenchen, HRA 74606, Geschäftsfuehrung: secnetix Verwaltungsgesellsch. mbH, Handelsregister: Registergericht Mün- chen, HRB 125758, Geschäftsführer: Maik Bachmann, Olaf Erb, Ralf Gebhart FreeBSD-Dienstleistungen, -Produkte und mehr: http://www.secnetix.de/bsd "Python is an experiment in how much freedom programmers need. Too much freedom and nobody can read another's code; too little and expressiveness is endangered." -- Guido van Rossum
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