Concurrent
maintenance is the capability
to perform I/O operations to an HP MA or EMA system while simultaneously
performing 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 perform 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 SAN Volume Controller 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