Date: Fri, 05 Mar 2010 16:38:10 +0100 From: Dimitry Andric <dimitry@andric.com> To: =?UTF-8?B?RGFnLUVybGluZyBTbcO4cmdyYXY=?= <des@des.no> Cc: Alexander Motin <mav@FreeBSD.org>, FreeBSD-Current <freebsd-current@freebsd.org>, "James R. Van Artsdalen" <james-freebsd-current@jrv.org> Subject: Re: Pack of CAM improvements Message-ID: <4B912562.6060500@andric.com> In-Reply-To: <86hbov3qtg.fsf@ds4.des.no> References: <4B55D9D4.1000008@FreeBSD.org> <823F6536-32A7-4BC6-9C6A-C84865A38458@samsco.org> <4B570B4C.9000203@jrv.org> <4B69817B.8090706@FreeBSD.org> <86hbov3qtg.fsf@ds4.des.no>
next in thread | previous in thread | raw e-mail | index | archive | help
On 2010-03-05 13:18, Dag-Erling Sm=C3=B8rgrav wrote: > Hmm, how does that work? Doesn't the BIOS spin the disks up long befor= e > the kernel even loads? Can you set a flag on the disk to tell it not > to? A jumper (marked PM2 on WD disks; no idea for other brands). From Wikipedia: "[PUIS] can usually be enabled by a jumper shunt on the drive but can be configured by other means (configuration sector) using manufacturer specific tools." and: "PUIS requires corresponding BIOS support. If [PUIS] is enabled on the drive but not supported by the BIOS, the drive will not be detected by the system or detected as zero in size. PUIS typically only supported on RAID Controllers." I have an Areca RAID card that indeed has this capability. It can also spin up the disks in staggered fashion, with a selectable interval.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?4B912562.6060500>