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, [EMAIL PROTECTED] ======================================================================== Whom computers would destroy, they must first drive mad.
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