[OpenAFS] AFS suggestions

David Bear David.Bear@asu.edu
Wed, 27 Jul 2005 14:29:37 -0700

On Wed, Jul 27, 2005 at 09:41:07PM +0200, Chris Huebsch wrote:
> On Wed, 27 Jul 2005, ERIC K. CHEU wrote:
> >
> >thanks... I'm actually not a novice AFS administrator.  But my bosses have 
> >just asked me to ask what other people to provide for more redandant 
> >storage and for charge back model.
> >We are already going to have a raid 5 system implemented to hold our AFS 
> >volumes.  And my boss was trying to think of ways to make AFS volumes more 
> >redundant while at the same time being available for change (something 
> >that is hard to do when you only can make read-only replicas).  Now
> >if there were such a thing as read-write replicas, then that'd solve a lot
> >of our problems...
> But there are not (yet). There are some strategies using ro-clones,
> which can be transformed to rw-volumes if worse things happen.

something I find intriguing is a program called rsnapshot. It uses
rsync and some other tools (gnu cp) to create time sliced snapshots.
They use hard links so that the N snapshots of M size don't occument
N X M space. Now, if openafs supported hardlinks.. this would be a
very efficient way of making a RO replica a near hot swappable clone
if the RW volume went away suddenly. Suggestions?

> And a further hint from me: Do never trust Raid 5. The disks are like
> twins. They have the same histroy, they lived the same live, they die
> the same day.
> Chris
> -- 
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David Bear
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