Avago Technologies MegaRAID SATA 150-4 (523) - Manual (Page 60)

3-12 BIOS Configuration Utility and MegaRAID Manager
Version 2.0 Copyright © 2003–2006 by LSI Logic Corporation. All rights reserved.
3.3.3.5 Physical Drive Submenu Description
Select this option from the Objects menu to select a physical drive and
to perform the operations listed in
Table 3.6 .
Cache Policy Use this option to enable read buffering in cache memory. Cache Policy applies to
reads on a specific logical drive. It does not affect the Read-Ahead cache. The default
setting is Direct I/O.
Cached I/O specifies that the controller buffers all reads in cache memory.
Direct I/O specifies that the controller does not buffer reads in cache memory. Data
is transferred to cache and the host concurrently. If the same data block is read again,
it comes from cache memory.
#Stripes Indicates the number of data segments striped across hard drives in a logical drive.
Drive State Indicates the drive state of a logical drive. The states are OPTIMAL, DEGRADED, and
OFFLINE.
1. The adapter must have a battery backup unit to support write-back caching.
Table 3.5 Configuration Utility View/Update Parameters Submenu (Cont.)
Option Description