we have a two node AFF400 cluster, plan to expand it with another two nodes of AFF800. we know we can expand the existing cluster to have four nodes with two HA pairs or optionally to have two clusters, one for AFF400, another one for AFF800.
Since the AFF800 will be used dedicatedly for Exchange servers only. is there any suggestion which one is better for us?
for a single cluster, we know it is a better idea if we have data moving around between two pairs, but if any cluster maintenance, will all four nodes be affected?
thanks in advance.