Date: Mon, 10 Jan 2005 19:50:35 -0600 From: David Kelly <dkelly@HiWAAY.net> To: FreeBSD_Questions FreeBSD_Questions <freebsd-questions@freebsd.org> Subject: Re: hdparm for FreeBSD? Message-ID: <2F76D2B4-6373-11D9-BF52-000393BB56F2@HiWAAY.net> In-Reply-To: <200501101933.40656.kirk@strauser.com> References: <200501101541.01854.kirk@strauser.com> <443bx8khsp.fsf@be-well.ilk.org> <200501101933.40656.kirk@strauser.com>
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On Jan 10, 2005, at 7:33 PM, Kirk Strauser wrote:
> On Monday 10 January 2005 05:04 pm, Lowell Gilbert wrote:
>
>> You mean like atacontrol(8)?
>> Or maybe you mean something more like tunefs(8)?
>
> Nope. atacontrol returns information about a drive's capabilities,
> but offers
> no way to change the settings that affect them. Example:
>
> # atacontrol cap 2 0
> [...]
> write cache yes yes
> read ahead yes yes
> dma queued no no 0/0x00
> SMART yes yes
> microcode download yes yes
> security yes no
> power management yes yes
> advanced power management no no 0/0x00
> automatic acoustic management yes no 254/0xFE
> 128/0x80
>
> shows that read ahead is available and enabled, but I don't have a way
> to turn it off. tunefs only affects a filesystem's attributes but not
> the underlying hardware.
"man ata" lists the sysctl for controlling write caching:
hw.ata.wc
set to 1 to enable Write Caching, 0 to disable (default is
enabled).
WARNING: can cause data loss on power failures.
I don't know of any tool for setting the wc preference on a
per-ata-drive basis for FreeBSD. Camcontrol allows setting the mode
page on SCSI devices, which is where this task is performed in SCSI.
IIRC there was some discussion of support for S.M.A.R.T. coming to
FreeBSD, which seems like it would be the logical place for
manufacturers to provide a control interface to their drive hardware.
--
David Kelly N4HHE, dkelly@HiWAAY.net
========================================================================
Whom computers would destroy, they must first drive mad.
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