[OpenAFS] Practical strategies for a backup in a (very) small
Tue, 10 Jan 2006 21:51:54 -0500
On Tuesday, January 10, 2006 12:19:52 PM -0500 Madhusudan Singh
> With extensive help from Russ and others on this list, I setup our afs
> cell on a debian server many months ago, and it has been working out for
> us really well. I have defined backup volumes for every user and bos
> executes a backup process every 24 hours at an unearthly hour. However,
> the backup volume is located on the same physical disk as the actual
> user volumes, and thus is really not a backup.
> The physical location of the cell server (there is only one machine in
> this cell with no plans to add any more) is quite secure. I would like
> to migrate the backup volumes onto removable storage all the same (such
> as a large USB harddisk). I have a few questions :
> 1. Is this a wise choice given the constraints (I cannot add any more
> machines to this cell, at least right now) ?
> 2. Depending on your opinion on 1, how should I migrate the backup
> volume, nothing else, to the new location ?
You cannot "migrate" backup volumes to storage other than where the
corresponding read/write volume resides. An AFS backup volume is a
read-only, copy-on-write snapshot of its parent; it is intended to allow
users to recover from unintended changes without administrator intervention
(if they notice soon enough), and to provide something you can take offline
long enough to dump it without causing a significant service outage.
For disaster recovery, you will need to perform regular volume dumps to
separate media such as disk or tape, using 'vos dump', the built-in backup
system, or one of several third-party packages which are available for this
-- Jeffrey T. Hutzelman (N3NHS) <email@example.com>
Sr. Research Systems Programmer
School of Computer Science - Research Computing Facility
Carnegie Mellon University - Pittsburgh, PA