Geographically Dispersed Clustering with Clariion

re: Geographically Dispersed Clustering with Clariion

Oliver Simpson — Fri, 05 Oct 2007 07:54:51 GMT

Hello John,

I've found your blog very useful but I want to understand one of your points a little better.

I want to understand the details surrounding the quorum abitration issue that you highlight with MirrorView. Can you elaborate?

What does SRDF/CE do to get round this issue that MirrorView cannot?

Any further information you can give would be very much appreciated.

re: Geographically Dispersed Clustering with Clariion

Ira Pfeifer — Wed, 16 May 2007 16:38:48 GMT

Great stuff - thanks for the column, John. Now I just have to talk management into letting me experiment with MV scripts...

re: Geographically Dispersed Clustering with Clariion

Edwin vMierlo — Tue, 15 May 2007 12:45:48 GMT

Very interesting topic !

I am a big fan of geo-clustering, and have indeed seen this. There are indeed people out there who are running this (this = scripting and MV).

some tips if you are planning of testing this:

1) if you use MNS cluster, ensure you install a file-share-witnes as your 3rd node (to maintain majority in your cluster)

2) if you are scripting your MV commands, ensure your physical disk resource is dependent on the script, this way your script executes first when coming online (after a failover) and does all the MV commands prior to the disk itself coming online.

if you do not do 2, then cluster is trying to online your disk while the MV commands have not executed yet. Your Physical disk resource will fail, and (depending on settings) this might cause a failback.

MV/CE... good name for it John, I am definitely going to name it that way !