From nobody@FreeBSD.org  Mon Dec  4 18:27:55 2006
Return-Path: <nobody@FreeBSD.org>
Received: from mx1.FreeBSD.org (mx1.freebsd.org [69.147.83.52])
	by hub.freebsd.org (Postfix) with ESMTP id 0FDBC16A40F
	for <freebsd-gnats-submit@FreeBSD.org>; Mon,  4 Dec 2006 18:27:55 +0000 (UTC)
	(envelope-from nobody@FreeBSD.org)
Received: from www.freebsd.org (www.freebsd.org [69.147.83.33])
	by mx1.FreeBSD.org (Postfix) with ESMTP id D524043CB1
	for <freebsd-gnats-submit@FreeBSD.org>; Mon,  4 Dec 2006 18:27:19 +0000 (GMT)
	(envelope-from nobody@FreeBSD.org)
Received: from www.freebsd.org (localhost [127.0.0.1])
	by www.freebsd.org (8.13.1/8.13.1) with ESMTP id kB4IRp01056459
	for <freebsd-gnats-submit@FreeBSD.org>; Mon, 4 Dec 2006 18:27:51 GMT
	(envelope-from nobody@www.freebsd.org)
Received: (from nobody@localhost)
	by www.freebsd.org (8.13.1/8.13.1/Submit) id kB4IRpQb056456;
	Mon, 4 Dec 2006 18:27:51 GMT
	(envelope-from nobody)
Message-Id: <200612041827.kB4IRpQb056456@www.freebsd.org>
Date: Mon, 4 Dec 2006 18:27:51 GMT
From: Dieter<freebsd@sopwith.solgatos.com>
To: freebsd-gnats-submit@FreeBSD.org
Subject: Need to control disk write cache on per-disk basis
X-Send-Pr-Version: www-3.0

>Number:         106340
>Category:       kern
>Synopsis:       [ata] [request] Need to control disk write cache on per-disk basis
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          closed
>Quarter:        
>Keywords:       
>Date-Required:  
>Class:          change-request
>Submitter-Id:   current-users
>Arrival-Date:   Mon Dec 04 18:30:14 GMT 2006
>Closed-Date:    Tue Nov 02 01:01:52 UTC 2010
>Last-Modified:  Tue Nov 02 01:01:52 UTC 2010
>Originator:     Dieter
>Release:        6.0
>Organization:
>Environment:
>Description:
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.

There are many times it would be very useful to be able to put one disk
into write-back mode and get the 10x speedup.  But we cannot do this in
FreeBSD because putting all the filesystems at risk of getting scrambled
is unacceptable.
>How-To-Repeat:

>Fix:

>Release-Note:
>Audit-Trail:

From: mjacob@freebsd.org
To: Dieter <freebsd@sopwith.solgatos.com>
Cc: freebsd-gnats-submit@freebsd.org, freebsd-bugs@freebsd.org
Subject: Re: kern/106340: Need to control disk write cache on per-disk basis
Date: Mon, 4 Dec 2006 10:51:18 -0800 (PST)

 > 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
 
 
 

From: Dieter <freebsd@sopwith.solgatos.com>
To: mjacob@freebsd.org
Cc: freebsd-gnats-submit@freebsd.org, freebsd-bugs@freebsd.org
Subject: Re: kern/106340: Need to control disk write cache on per-disk basis 
Date: Mon, 04 Dec 2006 12:27:46 +0000

 In message <20061204104730.H15778@ns1.feral.com>, mjacob@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.
State-Changed-From-To: open->suspended 
State-Changed-By: linimon 
State-Changed-When: Mon Jan 28 09:18:09 UTC 2008 
State-Changed-Why:  
Mark suspended awaiting patches. 

http://www.freebsd.org/cgi/query-pr.cgi?pr=106340 

From: Dieter <freebsd@sopwith.solgatos.com>
To: linimon@freebsd.org
Cc: freebsd-bugs@freebsd.org, bug-followup@freebsd.org
Subject: Re: kern/106340: [sata] [request] Need to control disk write cache on per-disk basis 
Date: Sun, 06 Sep 2009 13:12:47 PDT

 In message <200801280918.m0S9IIeB005075@freefall.freebsd.org>, linimon@freebsd.org writes:
 > Synopsis: [sata] [request] Need to control disk write cache on per-disk basis
 > 
 > State-Changed-From-To: open->suspended
 > State-Changed-By: linimon
 > State-Changed-When: Mon Jan 28 09:18:09 UTC 2008
 > State-Changed-Why: 
 > Mark suspended awaiting patches.
 > 
 > http://www.freebsd.org/cgi/query-pr.cgi?pr=106340
 
 The patch in PR kern/127717: [ata] [patch] - support write cache toggling per device
 works for me.  Thanks, Jeremy!
 
 If someone would check the patch in, they could close both PRs.
State-Changed-From-To: suspended->closed 
State-Changed-By: arundel 
State-Changed-When: Tue Nov 2 00:58:49 UTC 2010 
State-Changed-Why:  
I'm closing this PR, since 127717 deals with the same issue and (unlike this PR) 
contains a patch. 

http://www.freebsd.org/cgi/query-pr.cgi?pr=106340 
>Unformatted:
