RE: Veritas Volume Replicator instead of DataGuard
- From: "Binh Pham" <binhpham15@xxxxxxxxxxx>
- To: <careljan@xxxxxxxxxx>
- Date: Wed, 12 Sep 2007 16:55:14 -0700
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@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx]
On Behalf Of Carel-Jan Engel
Sent: Wednesday, September 12, 2007 2:59 PM
To: binhpham15@xxxxxxxxxxx
Cc: oracle-l@xxxxxxxxxxxxx
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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