Date: Sun, 24 Oct 2010 17:53:06 +0100 From: Bruce Cran <bruce@cran.org.uk> To: Alexander Motin <mav@FreeBSD.org> Cc: Alexander Best <arundel@freebsd.org>, freebsd-scsi@freebsd.org, Oliver Fromme <olli@lurza.secnetix.de>, freebsd-hackers@freebsd.org Subject: Re: Summary: Re: Spin down HDD after disk sync or before power off Message-ID: <20101024175306.00003c66@unknown> In-Reply-To: <4CC4633D.4070605@FreeBSD.org> References: <201009161742.24228.tijl@coosemans.org> <201009161619.o8GGJAmv035378@lurza.secnetix.de> <20101018155944.GA12425@freebsd.org> <868w1r92rf.fsf@ds4.des.no> <20101021122110.GA65490@freebsd.org> <86zku77mj6.fsf@ds4.des.no> <20101021130730.GA72290@freebsd.org> <86r5fj7gin.fsf@ds4.des.no> <20101024011854.GB78293@freebsd.org> <4CC4633D.4070605@FreeBSD.org>
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On Sun, 24 Oct 2010 19:47:57 +0300 Alexander Motin <mav@FreeBSD.org> wrote: > Comparing two ways implementing spindown, I've recalled that both of > them using xpt_polled_action() method, which depends on working > controller polling operation. So they could be almost equaly not good. > But the method present in HEAD now is more universal. Looking on fact > that need of spindown is not so obvious for SCSI devices (in SAN > environments), we can just make kern.cam.power_down tunable a bitmask > of supported protocols for now. Patch is attached. I've just committed the patch to move the functionality into ada(4). Should it be reverted? -- Bruce Cran
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