NEC Express5800 series User Manual page 41

Properties
Choose [Properties] to display the properties of the selected logical drive. Each logical
drive can be displayed by selecting the [Previous] or [Next] buttons. Indications on the
screen may not be aligned, however, it will not affect on other operation.
Change Config
You can change Cache Policy, change Read Policy, change Write Policy, and change the
RAID level via this sub-menu.
Change Cache Policy
–
You can choose Direct or Cached.
Change Read Policy
–
You can choose Normal, Read Ahead, or Adaptive Read Ahead.
Read Policy
Normal
Read Ahead
Adaptive Read Ahead
Change Write Policy
Description
The controller does not use read-ahead for the selected
logical drive. This is the default setting.
The controller uses read-ahead for the selected logical drive.
The controller uses read-ahead if the two continuous disk
accesses occurred in sequential sectors. If all read requests
are random, the controller does not use read-ahead.
However, all requests are still evaluated for possible
sequential operation.
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