We have a 3 node DAG, NODE01 + 02 are in our Primary DC and NODE03 is in our DR DC, we have 15 mail databases currently holding about 1200 mailboxes although a good 200 of these at least are not live.
The current setup has all live copies of the databases on NODE01
NODEs 02 + 03 just hold passive copies.
On node01 we are constantly at 0% or 1% memory available, each server has 72GB RAM,
My question is would we be better to split the databases over NODE01 + 02 in our PDC.
We have 3rd party support on this and they said it wouldn't make any difference to memory usage as it has to copy the mail to the passive databases anyway but i'm not sure that's correct, I would have thought that hosting a passive copy of the DB would be less resource intensive than running the live databases
Any help would be appreciated