Dell Compellent Series 30 Manual de usuario descargar pdf (Pagina 122)

114 Storage Center 5.5 System Manager User Guide

Disks

Introduction

This chapter describes how to view and manage disks and disk folders. Only Administrators

can manage disks and disk folders. Some commands, indicated in the command

description, are available only when specifically included in Administrative privileges.

System Manager displays disks both physically and logically. Physically, disks are grouped

by the enclosure in which they reside as shown in the Enclosures folder icon.

• Logically, the System Manager groups disks by type, such as a 7K, 10K, 15K, and Solid

State Disk (SSD). Disks types are grouped without regard to IO speed. For example, 7K

disks in a SAS enclosure will be in the same RAID level as 7K drives in an SBOD

enclosure. A disk folder contains both managed and spare drives. Managed drives are

used for data storage; spare drives are held in reserve to automatically replace a drive

if a managed drive fails.

• The ability of Storage Center to optimize data storage is hampered by systems using

Advanced Options. Before using Advance Options, consult with Dell Support Services

so that you understand the impact changes would have on your system.

Storage Types and Storage Classes

A storage type describes a pool of storage with one datapage size (512KB, 2MB, or 4MB)

and either redundancy or no redundancy. Because Data Progression (an automatic

process that moves old data to slower disks) cannot move data between storage types, a

second storage type is a less efficient use of storage. Create a non-standard storage type

only when an application requires a datapage size smaller or larger than the default 2-MB

datapage. Only an Administrator can create a storage type, and only if his or her User

Volume Defaults permit changes.

Storage classes exist within each storage type for which a disk folder has been prepared.

Each storage class represents allocated RAID space within a tier of disks in the disk folder.

For redundant storage types, RAID levels of storage classes within each tier depend on the

redundancy level selected for that tier.

• Single redundant tiers can contain storage classes of RAID 10, RAID 5-5, or RAID 5-9.

• Dual redundant tiers can contain storage classes of RAID 10-Dual Mirror, RAID 6-6, or

RAID 6-10.

• Non-redundant storage types use RAID 0 in all classes, in all tiers.

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Dell Compellent Series 30 Manual de usuario Pagina 122