[OpenAFS] Volume backup in distinct server

[Derek Atkins]

"vos addsite"
"vos release"

-derek

Joao Pedro Barreto <jpbarreto@gsd.inesc-id.pt> writes:

> Hi,
> 
> But, after creating the clone in the same server/partition as the
> original volume, how can I copy its contents accross the net to the
> other server/partition?
> Is there any way I could do this using exclusively AFS commands? Or do
> I have to copy everything by my own hands, for example using a simple
> Unix cp command? And how can I configure it to be periodic, for
> instance, to be performed daily?
> 
> The best thing I can think of is to issue a 'vos dump' command to the
> readonly clones, and piping its output to a 'vos restore' on the other
> server/partition. Putting this line for each volume I want to backup
> in a shell script and configure it in chron, I might have my problem
> solved.
> Do you find any problems with this solution? Or is there any better
> approach?
> 
> Thank you.
> Joao
> 
> 
> Derek Atkins wrote:
> > Hi,
> > The backup volume is meant for user access to backup data, not for
> > "replication across servers".  It's on the same server to reduce
> > the amount of disk space that is used.  It's purpose is not to protect
> > against lost disks, it's purpose is to protect against "rm".
> > What you seem to want is ReadWrite replication, which is something
> > that AFS does not do.
> > One thing you CAN do is make a RO clone on the same server/partition
> > as the RW (as well as on the other server).  The local RO clone wont
> > take up much disk space (it's a clone after all, just like the Backup
> > volume), but it does help in terms of the locking.  The RW only gets
> > locked in order to make the clone, and then the clone is copied across
> > the net.  This means your RW volume isn't locked for the whole release
> > process, only during the clone.
> > -derek
> > Joao Pedro Barreto <jpbarreto@gsd.inesc-id.id> writes:
> >
> >>Hi,
> >>
> >>I administer an AFS domain which has two servers storing file volumes.
> >>I wanted to configure volume backup, so that each volume stored in one
> >>server's disk would be replicated (or backed up) in the other server's
> >>disk.
> >>My first approach was to create read-only replicas of each volume. For
> >>instance, if a volume was stored in server A, I would create a
> >>read-only volume for it on server B. However, I soon discovered that
> >>the release of volumes (which I'd perform daily in order to update the
> >>read-only volumes) NEEDS TO LOCK the original volume, which can be a
> >>serious drawback if we consider that most volumes are sufficiently big
> >>to take some hours to be released.
> >>I then found about the backup functionality which, according to AFS
> >>documentation, should be the best choice for my problem. Mainly, this
> >>solution doesn't require locking of the original volumes to update the
> >>backup volumes. However, this option only allows creation of backup
> >>volumes in the SAME PARTITION (AND SERVER) as the original
> >>volume. Which, of course, is insuficient to my requirements of having
> >>backup volumes in distinct computers from their original volumes (so
> >>that, if a computer fails and its data are lost, the volume can still
> >>be obtainable from the other computer).
> >>
> >>Does anyone can help me on this? how should I solve my problem?
> >>
> >>Thank you in advance.
> >>
> >>Joao
> >>jpbarreto _AT_ gsd _DOT_ inesc-id _DOT_ id
> >>
> >>
> >>_______________________________________________
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> >>OpenAFS-info@openafs.org
> >>https://lists.openafs.org/mailman/listinfo/openafs-info
> >
> 
> 
> 

-- 
       Derek Atkins, SB '93 MIT EE, SM '95 MIT Media Laboratory
       Member, MIT Student Information Processing Board  (SIPB)
       URL: http://web.mit.edu/warlord/    PP-ASEL-IA     N1NWH
       warlord@MIT.EDU                        PGP key available