Concurrent maintenance is the ability to perform I/O operations
to a controller while simultaneously performing maintenance on it.
Important: An EMC Field Engineer must perform
all maintenance procedures.
The EMC CLARiiON FC series and
the SAN Volume Controller cluster
allow concurrent replacement of the following components:
- Disk drives
- Controller fans (fans must be replaced within 2 minutes or controllers
are shut down.)
- Disk enclosure fans (fans must be replaced within 2 minutes or
controllers are shut down.)
- Controller (service processor: you must first disable cache)
- Fibre Channel Bypass cards (LCC)
- Power supplies (you must first remove fans.)
- Uninterruptible power supply battery (SPS)
EMC CLARiiON FC devices require that the I/O is quiesced during
code upgrade. Consequently, the SAN Volume Controller cluster
does not support concurrent upgrade of the FC controller code.
The
EMC CLARiiON CX series and the SAN Volume Controller cluster
allow concurrent replacement of the following components:
- Disk drives
- Controller (service processor or drawer controller)
- Power/cooling modules (modules must be replaced within 2 minutes
or controllers are shut down.)
- Uninterruptible power supply battery (SPS)
The SAN Volume Controller cluster
and EMC CLARiiON CX devices support concurrent code upgrade of the
CX controllers.
Note: - EMC CLARiiON procedures for concurrent upgrade must be followed
in all cases.
- The CX Series also has a feature called Data In Place Upgrade
which allows you to upgrade from one model to another (for example,
from the CX200 to the CX600) with no data loss or migration required.
This is not a concurrent operation.