Concurrent maintenance on HP MA and EMA systems

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Concurrent maintenance is the capability to complete I/O operations to an HP MA or EMA system while simultaneously completing maintenance operations on it.

Note: HP MA and EMA maintenance documentation uses the phrase rolling upgrade in place of concurrent maintenance. See this documentation because in some instances you must reduce the level of I/O before you can complete the maintenance procedure.
The HP MA and EMA systems allow concurrent replacement of the following components:
  • Drive
  • EMU
  • Blower
  • Dual power supply (One unit can be removed and replaced. The fan speed increases when only one power supply unit is present.)

The controller component is hot-pluggable, but concurrent maintenance of system I/O is not supported.

The HP MA and EMA systems do not allow concurrent replacement of the following components:
  • Single power supply (in a single power-supply configuration, the enclosure is disabled when the power supply fails.)
  • SCSI bus cables
  • I/O module
  • Cache