You can't do it with master servers, but you can with media servers.

Assuming that you have the band width on an environment with fiber to
multiple sites.

You could expand on this, but I am going to only work with 2 sites.

This works in a 5.X environment.

Site A  has production data
Site B  has Dev/QA data and is the Alternate site.

Assume that each has SAN attached tape drives and A SAN can be zoned to B
SAN devices and the tape devices are in either a stand alone robot or a
robot that can be partitioned.

At site A, employ a Media server (call it media-dual) that is controlled by
the master at Site B.  The media server should have multiple NIC's so that
it can communicate with the master at Site B and also communicate with the
clients at site A.

For critical information, back up the info with the master-B via media-dual.
Back it up to the drives at site A in case you need to do a restore or
create a dssu at site A for these backups.  Duplicate or de-stage the
backups from media-dual to drives configured at site B.

If site A goes away, you have the backups of the critical data (say the
systems with an RPO of 1-4 hours) at Site B and just start restoring to the
alternate site recovery system (because the Site B master did the backup).
You would have to restore with the force restore option.  If you used a DSSU
for the backup, you would have to promote the secondary copy to the primary
copy (this dings me every time).  If you are duplicating tapes from A-B,
then promote the copy during duplication or wait until you need a DR
restore.

A client initiated restore of this data may not be possible depending on
whether or not your networks are linked.  A master server does not have to
communicate with a client.  Only the media server has to communicate with a
client.  However, bplist or bp from the client is not possible unless the
client can communicate with the master.

 




Bobby Williams
2205 Peterson Drive
Chattanooga, Tennessee  37421
423-296-8200

-----Original Message-----
From: veritas-bu-bounces AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of Justin
Piszcz
Sent: Monday, February 04, 2008 9:26 AM
To: veritas-bu AT mailman.eng.auburn DOT edu
Subject: [Veritas-bu] Question: Is this possible?

Is it possible using multiple master servers (vaulting?) to make a secondary
backup in an alternate location?

Example: Assume you do cross-site backups between 2 sites.

siteA -> backup to -> siteB (has its own master) siteB -> backup to -> siteA
(has its own master)

If you have another site, call it siteC, can you do this with vaulting/or
some other way?

siteA -> backup to -> siteB (and also/or later copy to) -> siteC siteB ->
backup to -> siteA (and also/or later copy to) -> siteC

Keep in mind siteA,B,C each have their own master server.

What would be the best way to accomplish this?  This would solve the problem
of a dual site failure.

Justin.
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