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The Write Policy has the following modes depending on combination with WrtThru for BAD BBU.
Select a mode suitable for your environment.
WrtThru for BAD BBU
Checked
Write
WBack
Normal write back mode
Policy
(recommended)
This mode is available only when
N8103-108F additional battery
backup is installed.
The controller uses cache memory
for writing.
However, if the battery is being
charged or failed, the controller
operates in WThru (write through)
mode automatically. Thus, this mode
can provide higher data security.
WThru
Write through mode
This mode is recommended when
N8103-108F additional battery
backup is not installed.
The controller does not use cache
memory for writing data.
You can change parameters for VD definition except for RAID level and Stripe Size. On the
WebBIOS Top Menu, click [Virtual Disks] and specify parameters in "Policies" frame, then click
[Change].
Configuring Your Server 4-79
Unchecked
Constant write back mode
This mode is available even if
N8103-108F additional battery backup
is not installed.
The controller always uses cache
memory for writing. In this mode, the
data in cache memory may not be
protected from being damaged if the
power failure occurs due to
charge/discharge or defect of the
battery. Be sure to use UPS when
specifying this mode for write policy.
* This mode is unavailable.
If you do not check "WrtThru for BAD
BBU" at creation of VD, this item is
automatically checked after the VD has
been created.
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