Re: [Veritas-bu] Question: Is this possible?
2008-02-04 14:16:20
On Mon, 4 Feb 2008, Bobby Williams wrote:
> 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.
Arg, looking to have 3 separate environments ideally..
>
> 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.
Arg again! No SAN/fiber switches here, direct-attached (hence why the
master-server is what I am looking at).
>
> 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.
I thought of this as well, but for other reasons, having a master control
its own site actually turned out to be the best and having the clients
from the other backup to it (aka cross-site)
>
> 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.
Yeah I can kind of see this working..
>
> 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.
Understood..
>
> 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.
Yes.
A lot of this though stems from the fact I cannot do what I really want to
do, it is almost if the _real_ work around is just have the client backup
the data twice (if you wanted to be protected from a dual-site failure?)
clientA -> site B
clientB -> site C
Justin.
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