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Date:      Mon, 4 Dec 2006 10:51:18 -0800 (PST)
From:      mjacob@freebsd.org
To:        Dieter <freebsd@sopwith.solgatos.com>
Cc:        freebsd-bugs@freebsd.org, freebsd-gnats-submit@freebsd.org
Subject:   Re: kern/106340: Need to control disk write cache on per-disk basis
Message-ID:  <20061204104730.H15778@ns1.feral.com>
In-Reply-To: <200612041827.kB4IRpQb056456@www.freebsd.org>
References:  <200612041827.kB4IRpQb056456@www.freebsd.org>

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> 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?

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).

-matt






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