RE: Veritas Volume Replicator instead of DataGuard

CJE, I'm sure Veritas will counter with:

1. Don't care about bandwidth since there is a dedicated network for the transfer.
2. They have 2 modes of synchronization: Synchronous and Asynchronous in which case, delays can be configured to take care of the issues of logical corruption caused by applications or DBA's...
3. This one, a good one, Veritas needs to tell me if they have integrity checking on the standby side(s). BTW, they also allows 1 to many and many to 1 replications.
4. They can also have slower storage on the standby site with Asynch mode.

Any other information?

Thanks for the input.

-----Original Message-----
From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Carel-Jan Engel
Sent: Wednesday, September 12, 2007 2:59 PM To: binhpham15_at_hotmail.com
Cc: oracle-l_at_freelists.org
Subject: Re: Veritas Volume Replicator instead of DataGuard

Hi Binh,

In my opinion, there are numerous arguments to favour Data Guard over disk/san/volume replication. Just to mention a few:

1. Much less bandwidth reuired: just redo vectors get sent over, not a full block/cluster/track for every redo wrtite, data file write, archive write, control file write.......
2. Configuring a delay in applying archives at the DR site protects for 'logical' errors as well. That has saved some asses of customers in the past
3. Applying the archives at the standby implies a sanity check of the archives themselves: a bit fallen over (whatever rare it is) in a disk block gets detected.
4. Independency of storage architecture: you can afford to have a smaller/slower/older SAN at the DR site, as long as you can store all database files. You can even afford to have no SAN but JBOD/NAS/DAS at the DR site, or just no SAN at all at both ends.

Of course there are some arguments in favour of disk/san/volume replication as well:

1. No Oracle license required at the DR site if you do not do the sanity checks more often than at 10 days per year.
2. One 'topic of expertise' needed for DR

I can't think of more right now, but maybe my mind is a little biased ;-)

HTH Best regards,

Carel-Jan Engel

===
If you think education is expensive, try ignorance. (Derek Bok) ===

On Wed, 2007-09-12 at 14:52 -0700, Binh Pham wrote:         

        Any one who has used Veritas Volume Replicator in place of DataGuard for

        disaster recovery or failover setups?         

        Any issues or problems? Pro's and con's?         

        Thanks.         

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