Avago Technologies MegaRAID SATA 150-4 (523) - Manual (Page 120)

5-18 Start the Power Console Plus Utility
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5.4.4.1 Read Policy Menu
Table 5.9 describes the Power Console Plus read policy menu.
5.4.4.2 Write Policy Menu
Table 5.10 describes the Power Console Plus write policy menu.
5.4.5 Progress Menu
The Progress menu displays a progress bar for a task. Progress bars are
available for rebuilds, initializations, diagnostics tests, consistency
checks, or drive reconstructions. The Progress menu also provides a
performance monitor that displays the MegaRAID system performance.
Table 5.9 Power Console Plus Read Policy Menu
Option Description
Normal The MegaRAID controller does not use read-ahead caching for the selected logical drive.
Read Ahead The MegaRAID controller uses read-ahead caching for the selected logical drive. This
is the default setting.
Adaptive Read
Ahead The MegaRAID controller uses read-ahead caching if the two most recent disk
accesses occurred in sequential sectors. If all read requests are random, the algorithm
reverts to Normal. All requests are evaluated for possible sequential operation.
Table 5.10 Power Console Plus Write Policy Menu
Option Description
Write-back The MegaRAID controller sends a data transfer completion signal to the host when the
controller cache receives all the data in a transaction.
Write-through The MegaRAID controller sends a data transfer completion signal to the host when the
disk array receives all the data in a transaction. This is the default setting.