NBU upgrade to 7.6.0.3 in cluster environment.

Hi Team,

We are planning to upgrade the NBU ina VCS clustered infra from 7.6.0.1 to 7.6.0.3

I am aware that its advised to perform this on secondary node first then to upgrade secondary node.

My concern is can I only upgrade the binaries in secondary node and then upgrade the primary volume which hosts the catalog in a drive (Replicated using SRDF)

Has anybody pefromed the upgrade in such infra, 

Kindly advice.