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 Lenovo Storage V series 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