The goal is to increase the size of both eqiad and codfw clusters to 36 nodes. We want to keep the specs as close as possible to the current server to ensure uniform load.
CPU: Dual Intel(R) Xeon(R) CPU E5-2640 v3
Disk: 800GB raw raided space (2x 800GB SSD RAID1 or similar, software RAID is fine)
Number of servers:
eqiad: 36-31 = 5
codfw: 36-24 = 12
numbers are: [desired size of cluster] - [current size of cluster] = [number of servers to add]