Date: Mon, 25 May 1998 10:04:43 -0400 (EDT) From: Robert Watson <robert@cyrus.watson.org> To: Walter Hafner <hafner@informatik.tu-muenchen.de> Cc: freebsd-hackers@FreeBSD.ORG Subject: Re: Vinum: first alpha release available Message-ID: <Pine.BSF.3.96.980525095852.11071C-100000@fledge.watson.org> In-Reply-To: <srjra1irg4b.fsf@hprbg5.informatik.tu-muenchen.de>
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On 25 May 1998, Walter Hafner wrote: > Quick question: What are the 'strategic' plans concerning volume > managers and FreeBSD? > > We have a variety of different tools that perform similar or at least > overlapping tasks: > > - CCD > - vinum > - coda > > The way I understand it: CCD is superseeded by vinum. But where comes > coda into place? I'm not sure that Coda currently fits into the picture cleanly. While it does offer volume management services, it also doesn't fit (server-side) into the current file system structure well. Volumes are Coda's granularity for replication/recovery locking, as well as its granularity for quotas (when implemented). As such, they are quite similar to the traditional concept of managed volumes, as they can be moved around from server to server as a chunk, etc. However, Coda stores the meta-data for the volumes in an RVM (Recoverable Virtual Memory -- a logged transactional VM system) partition due to Coda's version control and ACL requirements. What Coda might really benfit from is a transactional filesystem so that it can stop using RVM :). anyhow, so I'm not sure how this fits into the overall picture. Also, Coda is definitely cross-platform. The Linux people, however, have been integrating a number of kernel changes to support coda better, and I believe that the Coda kernel-side code is now in their standard release. Similarly, they are working on integrating PAG support into their kernel for authorization purposes. There was some discussion a few months ago on FreeBSD-Security about token-handling architectures -- we might want to wake up the discussion at some point and see if we can find a better general-purpose solution than PAGs. Robert N Watson ---- Carnegie Mellon University http://www.cmu.edu/ Trusted Information Systems http://www.tis.com/ SafePort Network Services http://www.safeport.com/ robert@fledge.watson.org http://www.watson.org/~robert/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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