Event processing services
| Daemon | Instances | Memory (Small/Default) | Memory (Med) | Memory (Large) | Config Options |
| zenactiond | 2 | 1 GB | 1 GB | 1 GB | If Impact installed proactively set maintenance-window-batch-size to 10 in zenactiond.conf and if not, leave at default 200. |
| zeneventd | S - 2; M - 4; L- 8 | 1 GB | 1 GB | 1 GB | |
| zeneventserver | 1 | 4 GB | 6 GB | 8 GB | |
| zenimpactstate | 1 | 1 GB | 1GB | 1 GB | If additional instances of zenimpactstate are required, disable pre-fetching in zenimpactstate.conf by setting prefetch 1. Failure to do so may result in messages being processed out of order, leading to inconsistent service state information (i.e., a clear event can be processed before its associated fault event). |