How many PE (Parsing Engine) can be configured in a Teradata Box -

Say, for a system with 8 nodes and 368 AMPS, what is the number of PE that should be configured? And how many sessions can each PE (default is 120)

Maximum of 10 PE per node is acceptable , But adding 2 PE nodes is better (this will give you optimum performance).

1 PE supports 128 sessions, where 8 are reserved for internal use SO 128-8 = 120 times per PE user is usable for use.