Re: DG for nologging
- From: Mladen Gogala <gogala.mladen@xxxxxxxxx>
- To: Jeff Chirco <backseatdba@xxxxxxxxx>
- Date: Tue, 6 Mar 2018 22:20:00 -0500
Replies in line:
On 03/06/2018 07:56 PM, Jeff Chirco wrote:
When you say " Continuous Disk Replication" you must not be talking
about storage based snapshots right?
Yes, I'm not talking about snapshots. Snapshots are discrete, not
continuous.
It replicates the disk on the fly?
It replicates disk synchronously. Every write request to the local disk
is also sent to remote disk. It is like DG, only for physical devices.
And is this a database consistent replication?
It guarantees disk consistency, if your network is wide enough.
I question if the database will actually startup in a fail over
situation.
It will. I was present during DR test for one of my clients which
performed fail-over with Hitachi HDS replication. It went flawlessly.
Maybe I am miss understanding.
As long as you don't misunderstimate things, you're OK.
--
Mladen Gogala
Database Consultant
Tel: (347) 321-1217
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