Date: Tue, 17 Mar 2009 05:29:15 -0700 From: Garrett Cooper <yanefbsd@gmail.com> To: "army.of.root" <army.of.root@googlemail.com> Cc: freebsd-current@freebsd.org, Andriy Gapon <avg@icyb.net.ua> Subject: Re: ata: printf on every spinup/spindown? Message-ID: <7d6fde3d0903170529u54d76afaiafc3db490aab8558@mail.gmail.com> In-Reply-To: <7d6fde3d0903170528g656e9edfn4fe5afc013c42999@mail.gmail.com> References: <49BE7C5A.2080103@icyb.net.ua> <49BEB449.9090302@googlemail.com> <7d6fde3d0903170528g656e9edfn4fe5afc013c42999@mail.gmail.com>
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On Tue, Mar 17, 2009 at 5:28 AM, Garrett Cooper <yanefbsd@gmail.com> wrote: > On Mon, Mar 16, 2009 at 1:19 PM, army.of.root > <army.of.root@googlemail.com> wrote: >> Andriy Gapon wrote: >>> >>> I am playing with ata spindown feature and I think that it is really >>> unnecessary >>> to print a message each time ata driver is going to spindown a disk or let >>> it be >>> spinned up: >>> ad6: Idle, spin down >>> ad6: request while spun down, starting. >>> ad6: drive spun down. >>> ad6: Idle, spin down >>> ad6: request while spun down, starting. >>> >>> Especially this is not useful when "Idle, spin down" messages are going >>> spin up >>> the disk via syslog logging to disk :-) >>> >>> Maybe put these under verboseboot if not drop entirely? >>> >> >> Hi, >> >> yah, I had some unpleasant experience with spinning down disks. That really >> is only useful for backup disks or similar disks which are not accessed >> frequently or used by any programs. >> >> :) The HDD consumes in Idle mode only something like 1W so it isnt really >> economic to spin it down. > > Spinning down to a lower RPM seems legitimate, compared to spinning it > down, which kills the drives. Look at WD's green drives -- they claim > to get 30% ~ 50% better power efficiency than standard drives. > > It may not seem like much, but HDD's really kill laptop batteries and > also really suck up juice in data centers. Any way to reduce energy > consumption without killing off hardware is really good in my book > 8-). > > Thanks PHK! Err... Andriy :P! > -Garrett
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