Dividing up site system roles
It is likely that most installations of CM consist of a single primary site with all roles loaded locally on the same server. Depending on the hardware used (RAM and disk IO chief among them), this will suffice for many organizations. As companies grow and the workload of CM starts to stress the hardware of a single server, administrators need to offload roles to other servers.
Note
Note that while it was a best practice to offload SQL in CM07, we now advise keeping SQL on box in CM12 as SQL replication has replaced much of the file based replication of CM07. CM12 is native x64 code so there is no performance hit for a WOW64 translation like there was with CM07 on x64 servers. Underpowered VMs, however, might benefit ...
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