Date: Mon, 7 Nov 2005 21:44:58 +0200 From: Ion-Mihai Tetcu <itetcu@people.tecnik93.com> To: Alexander Leidinger <Alexander@Leidinger.net> Cc: freebsd-ports@freebsd.org, le@freebsd.org Subject: Re: vinum, 5.x performance, ... (was: Re: ANNOUNCE: GNOME 2.12.1 has been merged into the ports tree) Message-ID: <20051107214458.30ca47f2@it.buh.tecnik93.com> In-Reply-To: <20051107145645.rav7hhtlsggk4sss@netchild.homeip.net> References: <20051106.131413.122956532.yasu@utahime.org> <1131176568.3960.20.camel@shumai.marcuscom.com> <20051106.131413.122956532.yasu@utahime.org> <op.szszvnn89aq2h7@mezz.mezzweb.com> <ZhqaDxv9wJ@dmeyer.dinoex.sub.org> <20051107111800.e199ndcxa8s0c444@netchild.homeip.net> <20051107122458.27a1f9e7@it.buh.tecnik93.com> <20051107145645.rav7hhtlsggk4sss@netchild.homeip.net>
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On Mon, 07 Nov 2005 14:56:45 +0100 Alexander Leidinger <Alexander@Leidinger.net> wrote: > Ion-Mihai Tetcu <itetcu@people.tecnik93.com> wrote: > > > On Mon, 07 Nov 2005 11:18:00 +0100 > > Alexander Leidinger <Alexander@Leidinger.net> wrote: > > > >> > - and performaces is a nightmare on atapi harddisks > >> > >> AFAIR 4.x enables the write cache (bad if there's a power failure > >> in the soft-updates case, since without native command queueing the > >> drivers may reorder writes witout the possibility to notify > >> soft-updates about it), > > > > So on NCQ disks write_caching should be safe from consistency > > point-of-view ? > > AFAIK: Enabling the write cache doesn't mean you use NCQ. So just > because your drive is able to do NCQ, you shouldn't enable the write > cache. If your controller, your disk and the OS is able to use NCQ, > and you enable the use of NCQ, then everything is fine... assuming > the drive doesn't lie to you. AFAIR there are or there where some > drives which lie(d), but I don't remember the details. And finding out the what disk and controller use NCQ _and_ are supported by our drivers can be done how ? Thanks, -- IOnut Unregistered ;) FreeBSD "user" "Intellectual Property" is nowhere near as valuable as "Intellect"
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