NetApp SAN 或 IP SAN 企业环境中的自动精简配置精品.pdf

Thin Provisioning in a NetApp SAN or IP SAN Enterprise Environment Richard Jooss, Network Appliance, Inc. June 2006, TR-3483 Abstract Traditional disk arrays force the IT storage specialist to allocate and dedicate storage space to a particular volume or LUN at creation time. The problem is that at creation time the true requirements are often not known, which forces overprovisioning and higher costs. Network Appliance™ storage systems offer powerful, flexible provisioning capabilities that give IT storage specialists the flexibility to lower cost while meeting capacity and performance requirements. This document describes the configurations and recommendations for efficiently provisioning NetApp SANiSAN storage. Table of Contents 1. Introduction 3 2. Intended Audience and Assumptions 3 3. Thin Provisioning 3 3.1 Definition 3 3.2 WAFL—The Enabling Technology 3 4. LUN Space Usage 4 4.1 Host versus Storage View 4 4.2 LUN Capacity Used over Time 6 5. Data ONTAP Configuration Parameters 7 5.1 LUN Reservation 7 5.2 Guarantees 7 5.3 Fractional_reserve 9 5.4 Snap Reserve 10 5.5 Volume Filling Example 10 5.6 Autosize 14 5.7 Autodelete 15 6. Thin Provisioning of LUNs 16 6.1 The Two Different Types of Thin Provisioning 16 6.2 Monitoring of Available Space 16 6.3 Thin Provisioning of LUNs 16 6.4 Thin Provisioning through LUN Growing 17 7. Thin Provisioning of Snapshot Space 18 7.1 Thin Provisioning of Snapshot Space 18 7.2 Thin Provisioning of Snapshot Space Configuratio