one node and many node SG clusters

[Shivkumar]

Hi,

I have some confusion in ServiceGaurd cluster. I read some document where it was mentioned that in a 2 node cluster only one node is involved in the data transaction and other node is available in case of failure of the first node.

How about 8 node clusters ? In such case how many nodes participate in accessing data at the same time ?

If many nodes access data at the same time then does it mean that they work on the kind of parallelism ?

Thanks,
Shiv

[Samir Pujara_1]

Hi,

Please check this:
http://docs.hp.com/en/ha.html#Serviceguard

[Steven E. Protter · Accepted solution]

Shalom Shiv,

The real limit you'll run into is the back end I/O on the data.

It is quite possible to set up an 8 node quorum with all eight nodes accessing the data at the same time, IF the application accessing the data is cluster aware and the volume group is mounted in shared mode.

This would be typical of an Eary Oracle RAC configuration prior to later releases in which Oracle released their own clusterware and negated the need for Serviceguard.

A far more typical configuration is active passive. A two node cluster is set up, with say Orace server on both. One node is running Oracle server in a package which is configured in case of failure to fail over to a second node. When it fails over to the second node, it activates the volume group in exclusive mode (-e) and starts the database application.

This provides high availability with an acceptable delay.

Regards,

Shmuel

[jitendra_8]

Hello Shiv
Here if you are running two kinds of applications and for that if you have configured two packages, You can run one pkg on one node utilizing your both node's resources.In case of one node failure,either of your pkg shall move on healthy node.But for these kind of configuration you must keep your both capable to run both pkg on one node.
Like wise you can increase no of nodes also with more applications requrements...

Thnx
jitendra

[Shivkumar]

Actually, i am working in a team on recommeding cluster solution to achieve faster processing by putting more nodes in cluster.

Other than High Availability faster processing is another goal.

Thanks,
Shiv