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  1. Online monitoring nodes - These nodes get the detector data 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.
  2. Fast feedback nodes - These nodes read the detector data from disk. By using the live option in psana, it's possible to read the data quasi real time as they are written to the FFB storage layer by the DAQ without the need to wait for the run to end. There is a farm of FFB nodes for each experimental hall.
  3. Offline nodes - These nodes read the detector data from disk. These nodes, made of both interactive nodes (psana pool) and batch farms (psanaq queue), are the main resource for doing data analysis and are shared across all LCLS instruments.

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