Replication Scheduling

Hi,

I am trying to setup replication on 2 PS4000.

I have 4 volumes which are part of a volume collection.

Enabling replication fails when I try to create a replica of the collection. The main SAN is running really old firmware which I believe is the issue. I will upgrade this, but want a backup first.

The volumes replicate fine individually. My question is when setting up replication scheduling. Is it ok to schedule all 4 volume's to replicate at the same time or is it best practice to schedule them separate?

Many thanks