Maximum blocksize for FFS?

Kirk McKusick mckusick at mckusick.com
Wed Dec 21 23:12:58 UTC 2011


> From: =?ISO-8859-1?Q?Olivier_Cochard=2DLabb=E9?= <olivier at cochard.me>
> Date: Wed, 14 Dec 2011 12:50:05 +0100
> Subject: Re: Maximum blocksize for FFS?
> To: Kirk McKusick <mckusick at mckusick.com>
> Cc: Dieter BSD <dieterbsd at engineer.com>, freebsd-fs at 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 at 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


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