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Date:      Fri, 1 Mar 2002 14:25:10 -0800
From:      Kris Kennaway <kris@obsecurity.org>
To:        Julio Castillo <jcastillo@edgenuity.com>
Cc:        questions@FreeBSD.org
Subject:   Re: ffs limits (on FreeBSD 4.5)
Message-ID:  <20020301142510.C18837@xor.obsecurity.org>
In-Reply-To: <EFEMIEMCHBNGIDKJFLOKCEFGCFAA.jcastillo@edgenuity.com>; from jcastillo@edgenuity.com on Fri, Mar 01, 2002 at 12:14:56PM -0800
References:  <EFEMIEMCHBNGIDKJFLOKCEFGCFAA.jcastillo@edgenuity.com>

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On Fri, Mar 01, 2002 at 12:14:56PM -0800, Julio Castillo wrote:

> My question is actually more on the order of the number of entries (number
> of files) that can be managed by the ffs. I understand that the file
> structures themselves (blocks, inodes, etc.) do occupy disk space
> themselves.
>=20
> On the assumption that the disk space is plentiful, are there any practic=
al
> limits on the number of files per file system, per directory? I'm looking
> for a file system that can store anywhere between 1 million and 100 milli=
on
> read-only files with any directory structure that can accommodate it.

In theory there aren't any hard limitations; in practise having a
million files in one directory will be incredibly inefficient and you
don't want to do it.  Instead, think about why you think you need to
have a million files in the same directory, and work out how you can
break them up into a directory hierarchy indexed by the filename or
some other hash, so each directory has a more manageable number of
files (e.g. /data/00/12/6F/asiofjlkajsf instead of /data/asiofjlkajsf)

Kris

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