Users Guide

NOTE: The default setting for Disk Cache Policy for virtual disks based on SATA drives is Enabled, and for virtual disks based on

SAS drives is Disabled.

NOTE: For SAS 6i/R and PERC H200 family of controllers, the Disk Cache Policy setting is available only after creating the

virtual disk.

Related Task

• Changing The Virtual Disk Policy

Background Initialization On PERC Controllers

On PERC controllers, background initialization of a redundant virtual disk begins automatically within 0 to 5 minutes after the virtual disk is

created. The background initialization of a redundant virtual disk prepares the virtual disk to maintain redundant data and improve write

performance. For example, after the background initialization of a RAID 5 virtual disk completes, the parity information is initialized. After

the background initialization of a RAID 1 virtual disk completes, the physical disks are mirrored.

The background initialization process helps the controller identify and correct problems that may occur with the redundant data later. In this

regard, the background initialization process is similar to a check consistency.

The background initialization should be allowed to run to completion. If canceled, the background initialization automatically restarts within

0 to 5 minutes. Some processes such as read and write operations are possible while the background initialization is running. However,

other processes such as creating a virtual disk, cannot be run concurrently with background initialization. These processes cause the

background initialization to cancel.

Non-RAID Controller Description

The non-RAID SCSI and SAS controllers are non-RAID controllers that support SCSI and SAS devices. Because these controllers are non-

RAID, they do not support virtual disks. You can manage these non-RAID controllers and their attached SCSI and SAS devices with Storage

Management.

NOTE

: Supported features may vary from controller to controller.

Non-RAID SAS Controllers

The following non-RAID controllers use Serial Attached SCSI (SAS) technology:

• HBA 330 MX

• HBA 330 MMZ

Firmware Or Driver Versions

Use the rmware or driver versions window to view information about the controller rmware and drivers. For more information on

rmware and drivers, see Before Installing Storage Management.