Users Guide

Table Of Contents
Controllers
This chapter provides information about the supported controllers and controller features in Storage Management.
Topics:
Controller
RAID Controller Technology - SATA And SAS
RAID Controller Features
Controller Supported RAID Levels
Controller Supported Stripe Sizes
RAID Controller Read, Write, and Disk Cache Policy
Background Initialization On PERC Controllers
Non-RAID Controller Description
Firmware Or Driver Versions
Controller Health
Controllers Properties And Tasks
Controller Tasks
System Configuration Lock Down Mode
Viewing Available Reports
Controller
Most operating systems do not read and write data directly from the disks, but instead send read and write instructions to
a controller. The controller is the hardware in your system that interacts directly with the disks to write and retrieve data.
A controller has connectors (channels or ports) which are attached to one or more physical disks or an enclosure containing
physical disks. RAID controllers can span the boundaries of the disks to create an extended amount of storage space or a
virtual disk using the capacity of more than one disk.
Controllers also perform other tasks, such as initiating rebuilds, initializing disks, and more. To complete their tasks, controllers
require special software known as firmware and drivers. In order to function properly, the controller must have the minimum
required version of the firmware and drivers installed.
Storage Management supports different types of controllers. If your system has a supported controller, the controller is
displayed by expanding the Storage object in the System tree view in the GUI. You can select the controller to display tabs for
executing controller tasks and viewing controller properties.
Different controllers have different characteristics in the way they read and write data and execute tasks. It is helpful to
understand these features to most efficiently manage the storage. The following sections describe the supported controllers
and their features.
RAID Controller Technology - SATA And SAS
Storage Management supports RAID controllers using SATA and SAS technology. This section indicates which technology the
supported RAID controllers use. For more information on these controllers, see Supported Features and the controller hardware
documentation.
SAS RAID Controllers
The following RAID controllers use Serial Attached SCSI (SAS) or SATA technology.
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48 Controllers