Dell 3 - Manual (Page 174)

172 PERC 3 BIOS Configuration Utility
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– No-Read-Ahead specifies that the controller does not use read-
ahead for the current logical drive.
– Read-ahead specifies that the controller uses read-ahead for the
current logical drive.
– Adaptive specifies that the controller begins using read-ahead if
the two most recent disk accesses occurred in sequential sectors. If
all read requests are random, the algorithm reverts to No-Read-
Ahead, however, all requests are still evaluated for possible
sequential operation. This is the default setting.
19 Set the Cache Policy.
Cache Policy applies to reads on a specific logical drive. It does not
affect the read ahead cache.
– Cached I/O specifies that all reads are buffered in cache memory.
– Direct I/O specifies that reads are not buffered in cache memory.
This is the default setting. Direct I/O does not override the cache
policy settings. Data is transferred to cache and the host
concurrently. If the same data block is read again, it comes from
cache memory.
20 Press <Esc> to exit the Advanced Menu.
21 After you define the current logical drive, choose Accept and press
<Enter>.
If space remains in the arrays, the next logical drive to be configured
appears.
22 Repeat steps 3 to 22 to create an array and configure another logical
drive.
If the array space has been used, a list of the existing logical drives
appears.
23 Press any key to continue and respond to the Save prompt.
24 Initialize the logical drives you have just configured.