NEC Express5800 Series User Manual page 42

5. Check the logical drive name, RAID level, and logical drive capacity in the [Name],
[RAID Level], and [Logical Drive Size] fields, respectively. Select other options if
necessary.
The options are described below.
Stripe Block Size
Write Cache
Gigabyte Boundary
Initialization
Write cache mode
The Write Cache Mode allows you to set the write cache mode of the logical drive. For
details, see the description of Write Cache Mode in "3.6.5 Logical Drive."
Auto Switch
(recommended)
Write Through
Write Back
Block size of logical drive. The default is 64 KB.
*Fixed to 64 KB in RAID 1.
Select any of AutoSwitch, WriteThrough, and WriteBack.
See "Write cache mode" described below.
Always set to "None."
Select any of None, Quick Initialization, and Full Initialization.
See "Types of initialization" described below.
* Grayed out in RAID0.
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 expected.
If this mode is selected, cache is not used in writing.
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.
- -
39