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- Online monitoring nodes - These nodes get detector data over the network and place it in shared memory on each node. The detector data are received over the network by snooping the multicast traffic between the DAQ readout nodes and the data cache layer. There is a set of monitoring nodes allocated for each instrument.
- Fast feedback nodes - These nodes read the detector data from diskdedicated disks that each experimental hutch has. It is possible to read the data in quasi-real time as they are written to the fast feedback (FFB) storage layer by the DAQ without waiting for the run to end. There is a farm of FFB nodes for each experimental hall.
- Offline nodes - These nodes read the detector data from disk. These nodes include both interactive nodes (psana pool) and batch farms (psanaq queue, see below). These nodes are the main resource for doing data analysis and are shared across all LCLS instruments.
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