From owner-freebsd-hackers Thu Oct 10 13: 8: 6 2002 Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 76CC137B401 for ; Thu, 10 Oct 2002 13:08:05 -0700 (PDT) Received: from swan.mail.pas.earthlink.net (swan.mail.pas.earthlink.net [207.217.120.123]) by mx1.FreeBSD.org (Postfix) with ESMTP id F16A343EB7 for ; Thu, 10 Oct 2002 13:08:04 -0700 (PDT) (envelope-from tlambert2@mindspring.com) Received: from pool0397.cvx21-bradley.dialup.earthlink.net ([209.179.193.142] helo=mindspring.com) by swan.mail.pas.earthlink.net with esmtp (Exim 3.33 #1) id 17zjbE-0002sP-00; Thu, 10 Oct 2002 13:08:00 -0700 Message-ID: <3DA5DDD8.3864BDCB@mindspring.com> Date: Thu, 10 Oct 2002 13:06:48 -0700 From: Terry Lambert X-Mailer: Mozilla 4.79 [en] (Win98; U) X-Accept-Language: en MIME-Version: 1.0 To: Scott Hess Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: Mount option "nomtime"? References: Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG Scott Hess wrote: > > That wouldn't make a difference, because the NetApp Filer would still > > schedule mtime updates for evey write access to the file that has been > > vnconfiged on the client. > > Probably talking through my hat, here, but doesn't NetApp use a LFS > (log-structured file system) variant? Almost. It's called WAFL, for "Write Anywhere File Layout". > In any case, assuming that I got the analysis right, that means the mtime > update should be essentially free, since it's already going to be writing > a new inode for the file to capture any new blocks written. Nope. The cost is not free. > http://www.netapp.com/tech_library/3001.html#I4, also note the Ousterhout > reference in the bibliography. An even stronger indicator is at > http://www.netapp.com/tech_library/3002.html#I35. Heh. You need to read your own references. 8-). -- Terry To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message