kern/106340: Need to control disk write cache on per-disk basis

[Dieter]

In message <20061204104730.H15778 at ns1.feral.com>, mjacob at freebsd.org writes:

> > FreeBSD only allows setting disk write cache mode on a system wide basis,
> > and only at boot time.  NetBSD allows setting the disk write cache mode
> > of each disk individually, and does not require a reboot.  See the NetBSD
> > dkctl(8) man page.
> 
> Which disks are you talking about? ATA disks?

Yes, SATA disks. 

> For scsi disks you can do modepage edits via camcontrol that change it 
> on a per-disk basis, so I assume you must be talking about ATA disks 
> here, in which case it sounds like a simple addition to atacontrol(8).

I did find camcontrol, but the only drive that shows up in camcontrol devlist
is the PATA CD/DVD drive.  This system doesn't have any real SCSI drives.