EMC in a cluster /SRDF CE 1

[oracleSQLdba]

We are planning on deploying an Active/Active cluster with EMC SRDF CE across two data storage devices. We'll use SRDF to keep the two data stores in sync.

What I'm unclear on is how / whether the quorum is split across two data stores with SRDF CE.

Please advise....

 

[xmsre]

You'd probably want to do an MNS cluster in this case so that both actives have access to a live copy of the quorum; otherwise I don't see how you could accomplish this. This will of course introduce a new problem; if one side goes down, the service goes offline on the survivor because you have an even number of nodes split across two sites and a majority can never bee reached. This means site failover will be a manual process.

Looking deeper into the design, I would think that you need to reevalute it. It's deeply flawed. Performance will be subpar, you'll be operating outside the MS support boundaries, and the system will be a constant source of support issues due to the IO loading of SRDF and the resource constrains of an A/A design.


Good luck

 

[JohnToner]

The Quorum is a single SRDF volume that is replicated between the sites. You should designate a small RDF volume for the quorum device. As needed, SRDF/CE will make the device RW enabled to the appropriate host. This works the same way with your data volumes.

As xmsre stated, you could also explore using a MNS quorum. Personally, I would recommend sticking with the standard shared quorum disk for a geographically dispersed cluster.

Regards,
John