NEC SigmaBlade AD106a Betriebsanweisung PDF herunterladen (Seite 92)

4-48 Configuring Your Storage and I/O Blade

The Disk Cache Policy has the following modes. Select a mode suitable for your environment.

Unchanged • The controller uses the default write cache policy of hard disk drive.

• The default value may not be identical to the factory-set value, therefore, do not

specify this mode.

Enabled • The controller always uses the write cache policy of hard disk drive.

• Be sure to use UPS when specifying this mode for disk cache policy.

Disabled • The controller does not use the write cache policy of the hard disk drive.

• This mode can provide the highest data security, however, the writing

performance is lower than that in Enabled mode.

• It is recommended to use this mode for the sake of data security.

IMPORTANT:

 If "Unchanged" is specified for Disk Cache Policy, the default value

may not be identical to the factory-set value, therefore, do not

specify this mode.

 If Enabled is specified for Disk Cache Policy, the controller uses the

write cache policy of the hard disk drive. Accordingly, the data in

cache memory of the hard disk drive may be lost at an occurrence of

power failure.

 Be sure to use UPS when using the cache memory of the hard disk

drive.

You can change parameters for VD definition except for RAID Level and Stripe Size. On the

WebBIOS Top Menu, click [Virtual Drives] and specify parameters in "Policies" frame, then click

[Change].

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NEC SigmaBlade AD106a Betriebsanweisung Seite 92