From owner-freebsd-fs@FreeBSD.ORG  Wed Dec 21 23:12:58 2011
Return-Path: <owner-freebsd-fs@FreeBSD.ORG>
Delivered-To: freebsd-fs@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id A491C1065670
	for <freebsd-fs@freebsd.org>; Wed, 21 Dec 2011 23:12:58 +0000 (UTC)
	(envelope-from mckusick@mckusick.com)
Received: from chez.mckusick.com (unknown
	[IPv6:2001:5a8:4:7e72:4a5b:39ff:fe12:452])
	by mx1.freebsd.org (Postfix) with ESMTP id 79DC88FC13
	for <freebsd-fs@freebsd.org>; Wed, 21 Dec 2011 23:12:58 +0000 (UTC)
Received: from chez.mckusick.com (localhost [127.0.0.1])
	by chez.mckusick.com (8.14.3/8.14.3) with ESMTP id pBLNCj2a054427;
	Wed, 21 Dec 2011 15:12:45 -0800 (PST)
	(envelope-from mckusick@chez.mckusick.com)
Message-Id: <201112212312.pBLNCj2a054427@chez.mckusick.com>
To: =?ISO-8859-1?Q?Olivier_Cochard=2DLabb=E9?= <olivier@cochard.me>
In-reply-to: <CA+q+TcrZeO6-Xj32aXpwP1HTJv0BrUdRYmjN5=3Vw54i4rs92A@mail.gmail.com>
Date: Wed, 21 Dec 2011 15:12:45 -0800
From: Kirk McKusick <mckusick@mckusick.com>
X-Spam-Status: No, score=0.0 required=5.0 tests=MISSING_MID, UNPARSEABLE_RELAY
	autolearn=failed version=3.2.5
X-Spam-Checker-Version: SpamAssassin 3.2.5 (2008-06-10) on chez.mckusick.com
Cc: freebsd-fs@freebsd.org, Dieter BSD <dieterbsd@engineer.com>
Subject: Re: Maximum blocksize for FFS? 
X-BeenThere: freebsd-fs@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Filesystems <freebsd-fs.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-fs>,
	<mailto:freebsd-fs-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-fs>
List-Post: <mailto:freebsd-fs@freebsd.org>
List-Help: <mailto:freebsd-fs-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-fs>,
	<mailto:freebsd-fs-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 21 Dec 2011 23:12:58 -0000

> From: =?ISO-8859-1?Q?Olivier_Cochard=2DLabb=E9?= <olivier@cochard.me>
> Date: Wed, 14 Dec 2011 12:50:05 +0100
> Subject: Re: Maximum blocksize for FFS?
> To: Kirk McKusick <mckusick@mckusick.com>
> Cc: Dieter BSD <dieterbsd@engineer.com>, freebsd-fs@freebsd.org
> X-ASK-Info: Message Queued (2011/12/14 03:50:37)
> X-ASK-Info: Confirmed by User (2011/12/14 04:45:07)
> 
> On Tue, Dec 13, 2011 at 7:18 PM, Kirk McKusick <mckusick@mckusick.com> wrote:
> > The default blocksize in FreeBSD 9.0 is 32K/4K. We have been
> > running with this size in -current for a almost a year with no
> > reported problems.
> 
> Hi,
> 
> There is a reported problem:
> The number of inode was divided by two with FreeBSD 9.0 (PR
> bin/162659) and this create some problems because "the number of
> fragments per inode (NFPI) was not adapted to the new default block
> size" (Bruce Evans'explanation [1]).
> 
> Regards,
> 
> Olivier
> 
> [1] http://lists.freebsd.org/pipermail/freebsd-bugs/2011-December/046713.html

Thanks for bringing your report to my attention. I have applied the
suggested change (reducing NFPI from 4 to 2) so as to keep the default
number of inodes for a 32K/4K filesystem the same as were created on
a 16K/2K filesystem.

	Kirk McKusick