IBM Storwize V5020 User Manual

508 Implementing the IBM Storwize V5000 Gen2 with IBM Spectrum Virtualize V8.1
10.3.12 Thin provisioned FlashCopy
FlashCopy source and target volumes can be thin-provisioned.
Source or target thin-provisioned
The most common configuration is a fully allocated source and a thin-provisioned target. By
using this configuration, the target uses a smaller amount of real storage than the source.
With this configuration, use the NOCOPY (background copy rate = 0%) option only. Although the
COPY option is supported, this option creates a fully allocated target, which defeats the
purpose of thin provisioning.
Source and target thin-provisioned
When the source and target volumes are thin-provisioned, only the data that is allocated to
the source is copied to the target. In this configuration, the background copy option has
no effect.
Thin-provisioned incremental FlashCopy
The implementation of thin-provisioned volumes does not preclude the use of incremental
FlashCopy on the same volumes. It does not make sense to have a fully allocated source
volume and then use incremental FlashCopy (which is always a full copy the first time) to copy
this fully allocated source volume to a thin-provisioned target volume. However, this action is
not prohibited.
Consider the following optional configurations:
򐂰 A thin-provisioned source volume can be copied incrementally by using FlashCopy to a
thin-provisioned target volume. Whenever the FlashCopy is performed, only data that was
modified is recopied to the target. If space is allocated on the target because of I/O to the
target volume, this space is not reclaimed with subsequent FlashCopy operations.
򐂰 A fully allocated source volume can be copied incrementally by using FlashCopy to
another fully allocated volume at the same time as it is being copied to multiple
thin-provisioned targets (taken at separate points in time). By using this combination, a
single full backup can be kept for recovery purposes, and the backup workload is
separated from the production workload. At the same time, older thin-provisioned backups
can be retained.
10.3.13 Background copy
With FlashCopy background copy enabled, the source volume data is copied to the
corresponding target volume. With the FlashCopy background copy disabled, only data that
changed on the source volume is copied to the target volume.
The benefit of using a FlashCopy mapping with background copy enabled is that the target
volume becomes a real clone (independent from the source volume) of the FlashCopy
mapping source volume after the copy is complete. When the background copy function is not
performed, the target volume remains a valid copy of the source data only while the
FlashCopy mapping remains in place.
Performance: The best performance is obtained when the grain size of the
thin-provisioned volume is the same as the grain size of the FlashCopy mapping.

IBM Storwize V5020 Specifications

General

Model	Storwize V5020
Category	Storage
Maximum Number of Drives	240
Form Factor	2U
Supported Protocols	iSCSI
Drive Types Supported	SSD, SAS, NL-SAS
Expansion Units	Up to 9
RAID Levels Supported	0, 1, 5, 6, 10
Host Interface	16 Gb FC, 10 Gb iSCSI
Interface Types	Fibre Channel, Ethernet, SAS
Power Supply	Dual redundant power supplies

Summary

Overview of the IBM Storwize V5000 Gen2 system

IBM Storwize V5000 Gen2 overview

Provides an overview of the Gen2 system, its models, and benefits.

IBM Storwize V5000 Gen2 models

Compares the features and specifications of different Storwize V5000 Gen2 models.

IBM Storwize V5000 Gen2 hardware

Describes the hardware components of the Storwize V5000 Gen2 solution.

Initial configuration

Hardware installation planning

Outlines requirements and checklist for planning hardware installation.

SAN configuration planning

Discusses planning for Fibre Channel SAN connectivity.

First-time setup

Guides through the initial setup process for a first-time IBM Storwize V5000 Gen2 service.

Initial configuration

Details how to complete the initial configuration, including component verification.

Storage pools

Working with internal drives

Describes configuring internal storage disk drives and actions on them.

Working with storage pools

Explains how storage pools are managed and created.

Working with managed disks

Details how to manage MDisks, including their modes and assignments.

Host configuration

Preparing the host operating system

Details steps to prepare Windows and VMware ESXi hosts for attachment.

Creating hosts by using the GUI

Guides on creating Fibre Channel, iSCSI, and SAS hosts.

Volume configuration

Creating volumes using the Volume Creation

Details creating basic, mirrored, custom, and HyperSwap volumes.

Mapping a volume to the host

Guides on mapping created volumes to hosts.

Storage migration

Storage migration wizard overview

Storage migration wizard

Details the steps involved in the storage migration wizard.

Advanced host and volume administration

Advanced host administration

Covers host modification, mappings, and deletion.

Advanced volume administration

Details volume modification and copy creation.

Advanced features for storage efficiency

Easy Tier

Describes the Easy Tier disk performance optimization function.

Thin provisioning

Real-time Compression software

Details the Real-time Compression software for storage efficiency.

Copy services

IBM FlashCopy

Describes the FlashCopy function for point-in-time copies.

Implementing FlashCopy

Remote Copy

Troubleshooting remote copy

HyperSwap

Explains HyperSwap functionality for high availability.

External storage virtualization

Planning for external storage virtualization

Describes planning steps for virtualizing external storage.

Working with external storage

RAS, monitoring, and troubleshooting

Reliability, availability, and serviceability features

Describes RAS features and monitoring.

Configuration backup

Explains how to back up system configuration.

System update

Describes updating node canister software and drive firmware.

Support Assistance

Describes local and remote support assistance.

Collecting support information

Details how to collect support data using GUI and CLI.

Powering off the system and shutting down the infrastructure

Encryption

Planning for encryption

Discusses planning for data-at-rest encryption.

Defining encryption of data at-rest

Activating encryption

Guides on activating encryption licenses.

Enabling encryption

Details enabling encryption using key servers or USB flash drives.

Rekeying an encryption-enabled system

CLI setup and SAN Boot

Command-line interface