Table 6-2. Virtual Disk Parameters and Descriptions (continued)

Parameter

Description

 

 

Read Policy

Read-ahead enables the Read-Ahead feature for the virtual

 

disk. You can set this parameter to Read-ahead,

 

No-read-ahead, or Adaptive. The default is No-read-ahead.

 

Read-ahead specifies that the controller uses Read-Ahead for

 

the current virtual disk. Read-ahead capability allows the

 

controller to read sequentially ahead of requested data and

 

store the additional data in cache memory, anticipating that

 

the data is required soon.

 

No-read-ahead specifies that the controller does not use

 

Read-Ahead for the current virtual disk.

 

NOTE: No-Read-Ahead shows higher performance results due to

 

the effectiveness of hard-drive caching algorithms.

 

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.

 

 

Virtual Disk Management

Creating Virtual Disks

NOTE: PERC 6 does not support creation of a virtual disk that combines SAS physical disks and SATA physical disks.

Perform the following steps to create virtual disks.

1During host system bootup, press <Ctrl><R> when the BIOS banner displays.

The Virtual Disk Management screen displays. If there is more than one controller, the main menu screen displays. Select a controller, and press <Enter>. The Virtual Disk Management screen displays for the selected controller.

NOTE: This procedure describes the BIOS Configuration Utility screens in Tree View.

2Use the arrow keys to highlight Controller # or Disk Group #.

Configuring and Managing RAID

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Dell UCC-60, UCP-61, UCP-60 manual Virtual Disk Management, Creating Virtual Disks

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