1-Bbu Cache Enable Mode; 1-Cnt Cache Enable Mode - NEC Storage S1300 User Manual

1-BBU Cache Enable Mode

When only a single battery backup unit is installed, the write cache operation mode can
be set using the management software (NEC Storage Manager). In this state, remember
that if a fault occurs in the battery backup unit, the failed battery backup unit must be
replaced with a new one immediately to avoid data loss. Ask your service representative
to replace the battery backup unit. Note also that data retention time is reduced to half
the normal time ( i.e. when two BBUs are installed).
OFF : The write cache is disabled in the single-BBU condition.
ON : The write cache is enabled even in the single-BBU condition. (factory-set)
Note:
only one battery backup unit is mounted to the disk array unit, or only
one of the two battery backup units is available due to a failure.

1-CNT Cache Enable Mode

When only a single controller is installed, the write cache operation mode can be set
using the management software (NEC Storage Manager). However, it is recommended
to disable this mode to avoid any loss of data should a fault occurs in the controller.
OFF : The write cache is disabled in the single-controller condition. (factory-set)
ON : The write cache is enabled even in the single-controller condition.
Note:
which only one controller is mounted to the disk array unit, or only
one of the two controllers is available due to a failure.
The single-BBU condition refers to the state in which
The single-controller condition refers to the state in
System Overview 1-21