From owner-freebsd-fs Sun Sep 12 12:54:57 1999 Delivered-To: freebsd-fs@freebsd.org Received: from mail.du.gtn.com (mail.du.gtn.com [194.77.9.57]) by hub.freebsd.org (Postfix) with ESMTP id 11BE81519C for ; Sun, 12 Sep 1999 12:54:13 -0700 (PDT) (envelope-from ticso@cicely8.cicely.de) Received: from mail.cicely.de (cicely.de [194.231.9.142]) by mail.du.gtn.com (8.9.3/8.9.3) with ESMTP id VAA22909; Sun, 12 Sep 1999 21:53:19 +0200 (MET DST) Received: from cicely8.cicely.de (cicely8.cicely.de [10.1.2.10]) by mail.cicely.de (8.9.0/8.9.0) with ESMTP id VAA70262; Sun, 12 Sep 1999 21:54:21 +0200 (CEST) Received: (from ticso@localhost) by cicely8.cicely.de (8.9.3/8.9.2) id VAA38384; Sun, 12 Sep 1999 21:54:19 +0200 (CEST) (envelope-from ticso) Date: Sun, 12 Sep 1999 21:54:19 +0200 From: Bernd Walter To: "Matthew N. Dodd" Cc: Bernd Walter , freebsd-fs@FreeBSD.ORG Subject: Re: Anyone working on HSM? Message-ID: <19990912215419.A38366@cicely8.cicely.de> References: <19990912102737.B37555@cicely8.cicely.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 0.95.3i In-Reply-To: ; from Matthew N. Dodd on Sun, Sep 12, 1999 at 03:01:58PM -0400 Sender: owner-freebsd-fs@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org On Sun, Sep 12, 1999 at 03:01:58PM -0400, Matthew N. Dodd wrote: > On Sun, 12 Sep 1999, Bernd Walter wrote: > > I'm in the situation to learn how the ffs code works to get mounted > > ffs-filesystems bigger and got some basic ideas about implementing HSM > > funktionality. > > I own a MO Jukebox so I have the needed hardware available. > > You might want to look at the code SGI released a while back; I'm not sure > that its and out and out HSM but it does have bits that you'll need. > XFS is a nice fs but I don't beleave it can come near the performance of a softupdated FFS. HSM does not sound to be very fast by principle but it's usefull to have a really fast FS at first stage if the stagedimensions are selected properly. The next point is that I found FFS with softupdates idealy for writing MOs if you don't want to use a streaming method. -- B.Walter COSMO-Project http://www.cosmo-project.de ticso@cicely.de Usergroup info@cosmo-project.de To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-fs" in the body of the message