NEC Express5800 Series User Manual page 34

Settings tab
Assigned Name
Write Cache Mode
Write Cache Status
The Write Cache Mode allows you to set the write cache mode of the logical drive.
Write Through If this mode is selected, cache is not used in writing.
Write Back If this mode is selected, cache is always used in writing. It is expected that
the setting improves writing performance. However, if the battery power is
insufficient, the data integrity at power-off is rather low. Thus, it cannot be
recommended to use this mode.
Auto Switch If an additional battery is connected and charged enough, the operation takes
place in the write back mode. The improvement of the writing performance
can be expected. When the battery power is insufficient, the operation takes
place in the write through mode. The data integrity at power-off can be kept.
If the battery state is other than Fully Charged and a voltage or temperature
error occurs (the voltage is less than 3.9 VDC or the temperature is lower
than 10 °C or higher than 60 °C) under the selection of "AutoSwitch," the
mode is automatically changed to "Write Through." In addition, the
following log is registered.
AutoCache write mode of logical drive "%s" is changed to %s
When the mode is changed, click [Submit] to enable the change.
Drive Mapping tab
Attention: This feature is supported only with N8103-89.
The Drive Mapping tab indicates how HDDs are mapped to a logical drive of RAID10 if any.
Expansion tab
Attention: This feature is supported only with N8103-89.
See "3.14 Expanding Logical Drive."
Name of logical drive
Selected write cache mode
Current write cache status
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