From owner-freebsd-hackers Fri Jun 21 4:59: 0 2002 Delivered-To: freebsd-hackers@freebsd.org Received: from dexter.zoopee.org (zoopee.org [192.117.108.58]) by hub.freebsd.org (Postfix) with ESMTP id 7C27737B40B for ; Fri, 21 Jun 2002 04:58:53 -0700 (PDT) Received: from alsbergt by dexter.zoopee.org with local (Exim 3.34 #2) id 17LN3t-0004hO-00 for freebsd-hackers@freebsd.org; Fri, 21 Jun 2002 14:58:45 +0300 Date: Fri, 21 Jun 2002 14:58:45 +0300 From: Tom Alsberg To: FreeBSD Hackers List Subject: Union filesystem / mount option Message-ID: <20020621115845.GA17902@zoopee.org> Reply-To: Tom Alsberg Mail-Followup-To: Tom Alsberg , FreeBSD Hackers List Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.4i 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 Hi there. I would like some clarification with regard to the union filesystem and mount option. First - what is the difference in principle between mounting with the union option (mount -o union) and the union filesystem type (mount_union)? Second - is there a way to have more than two filesystems stacked in a union? So that all writes will go to the upper layer, and reads will go down the stack until a lookup succeeds? That is - a way other than the inelegant and probably sub-optimal way of attaching some filesystem over an already-union filesystem to create another one? Thank you, any help appreciated, -- Tom -- Tom Alsberg - certified insane, complete illiterate. e-mail: Homepage: http://www.cs.huji.ac.il/~alsbergt/ * An idea is not responsible for the people who believe in it. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message