From owner-freebsd-hackers Wed Apr 7 22:31: 6 1999 Delivered-To: freebsd-hackers@freebsd.org Received: from alcanet.com.au (news.alcanet.com.au [203.62.196.10]) by hub.freebsd.org (Postfix) with ESMTP id B871715257 for ; Wed, 7 Apr 1999 22:30:55 -0700 (PDT) (envelope-from peter.jeremy@auss2.alcatel.com.au) Received: by border.alcanet.com.au id <40342>; Thu, 8 Apr 1999 15:15:34 +1000 Date: Thu, 8 Apr 1999 15:28:40 +1000 From: Peter Jeremy Subject: Re: Volume managers To: hackers@FreeBSD.ORG Message-Id: <99Apr8.151534est.40342@border.alcanet.com.au> Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG Whilst we're all making up wishlists for things we'd like to see (someone else implement): The `clone filesystem' command supported by Digital UNIX ADVfs is _very_ nice for `point-in-time' backups. (Basically clonefset makes a read-only snapshot of the filesystem - changes to the `active' filesystem are done using copy-on-write). Unfortunately, I suspect it couldn't be implemented within UFS (because UFS relies on blocks being at particular physical locations within a CG - ie superblock, array of inode blocks, data blocks - which would make creating the copy-on-write blocks difficult). Peter To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message