HP StorageWorks 8000 - NAS Guida all'installazione

HP Surestore NAS 8000 SAN High Availability Solution Integration Manual (SIM) 1

HP Surestore NAS 8000 SAN

High Availability Solution

Integration Manual (SIM)

Read Me First

This binder includes the details of the integration tasks that Hewlett-Packard or an authorized

reseller has performed. The first section, Solution Integration and Product Configuration

Overview, is intended to give you a detailed picture of the solution you ordered from Hewlett

Packard.

The remaining sections of this binder will be used by your installation specialist, who will work

with you to plan and install your HP Network Attached Storage (NAS) 8000 SAN High

Availability (HA) system according to your specific requirements.

Before installing the HP NAS 8000 SAN HA solution, you must first complete the items in the

“Network and Storage Planning” section of this binder. If your installation specialist has not

done so already, he or she will contact you to schedule a joint planning session.

After the planning is complete, your installation specialist will perform tasks included in this

binder’s “Installation Guide” section.

We sincerely hope that you will be delighted with our integration services and we are looking

forward to hearing from you.

Format Conventions

WARNING Identifies a hazard that can cause personal injury

Caution Identifies a hazard that can cause hardware or software damage

Note Identifies significant concepts or operating instructions

2 HP Surestore NAS 8000 SAN High Availability Solution Integration Manual (SIM)

Binder Contents

This binder contains the following sections:

Notice

Hewlett-Packard Company makes no warranty of any kind with regard to this material,

including, but not limited to, the implied warranties of merchantability and fitness for a

particular purpose. Hewlett-Packard shall not be liable for errors contained herein or for

incidental or consequential damages in connection with the furnishing, performance, or use of

this material.

This document contains proprietary information, which is protected by copyright. No part of

this document may be photocopied, reproduced, or translated into another language without

the prior written consent of Hewlett-Packard. The information contained in this document is

subject to change without notice.

Trademark Information

Java and all Java-based marks are trademarks or registered trademarks of Sun Microsystems,

Inc. in the U.S. and other countries.

Microsoft, Windows, and Windows NT are U.S. registered trademarks of Microsoft

Corporation.

UNIX is a registered trademark of The Open Group.

Section Audience Purpose

1. Read Me First Customer IT administrator Introduction

2. Solution Integration and

Product Configuration

Overview

Customer IT administrator Product information

3. Network and Storage

Planning

Installation specialist and

customer IT administrator

Pre-installation planning

session

4. Installation Guide Installation specialist Hardware installation and

software configuration

5. Safety Installation specialist and

customer IT administrator

Warnings and regulatory

information

6. Warranty and Support Customer IT administrator Warranty and technical

support contracts

Solution Integration and Product Configuration Overview 3

Solution Integration and

Product Configuration Overview

This section contains the following documents, which were customized and inserted by the

Integration Center:

■Deployment information

■Rack, server and component configurations

■Parts list

■Network, cabling, and power connection diagrams

4 Solution Integration and Product Configuration Overview

Network and Storage Planning 5

Network and Storage Planning

This section contains pre-planning materials that the installation specialist can review with the

customer before the NAS 8000 system arrives onsite. It includes:

■System Overview: a conceptual overview of the storage system of the HP NAS 8000 SAN

HA solution, including:

—Storage Overview and Terminology

—HA Storage Configuration

—Determining Available Disk Space

■Planning Worksheets to record network and storage settings. The information in the

planning worksheets is required to install and configure the system.

—Storage Planning

—High Availability Planning

—Network Planning

You need to construct an overall storage architecture by:

1. Determining the amount of total storage available

2. Deciding how to allocate it to different groups or functions

Storage space is spread across volume groups. In these volume groups, you must create file

volumes to divide your disk space. It is important that you plan storage space prior to creating

file volumes. Although the HP NAS 8000 lets you expand your volume groups later, you may

want to reserve extra space during setup to allow for the use of snapshots.

6 Network and Storage Planning

Storage Overview and Terminology

The HP NAS 8000 SAN HA is an easy-to-manage storage solution for heterogeneous

environments including Windows, UNIX, and Linux.

The storage space on the HP NAS 8000 SAN HA is made up of physical and logical storage:

■Physical storage refers to the hardware you use for data storage.

■Logical storage is created by software that organizes your physical storage into file

volumes and directories that are made accessible to users.

In addition, the HA configurations include high-availability features such as redundant

hardware and failover packages.

Physical Storage

The HP NAS 8000 SAN configurations can manage storage on a variety of devices within a

SAN including the HP Virtual Array 7100, HP Virtual Array 7400 series, and HP XP series disk

arrays using SecureManager VA or SecureManager XP.

Logical Storage

SAN

A SAN, or Storage Area Network, is a high-speed special-purpose network (or subnetwork)

that connects different kinds of storage devices with associated data servers on behalf of a

larger network of users. Typically, a SAN is part of the overall network of computing resources

in a company. SAN devices are usually close to other computing resources, but may also

extend to remote locations for backup and archival storage. HP NAS 8000 SAN solutions can

access storage on supported devices within the SAN.

Logical Unit Number

A logical unit number (LUN) is a logical aggregation of space on physical drives. LUNs are

unique identifiers that enable the controller to differentiate between separate devices (each of

which is a logical unit). Each LUN is a unique number that identifies a specific unit of storage.

The HP NAS 8000 SAN HA supports up to 127 LUNs.

Volume Groups

A volume group is the aggregation of one or more LUNs. Volume groups combine the space

from LUNs and make the space accessible to the file system for creating file volumes and

directories, which can then be made accessible to users.

File Volumes

A volume group is divided into one or more file volumes. File volumes are the basic unit of

logical storage for a file system on the HP NAS 8000 SAN HA. File volumes can be further

subdivided into individual directories.

Network and Storage Planning 7

Directories

Directories let you organize information. Directories contain files or other persistent data

structures in a file system that contains information about other files. Directories are usually

organized hierarchically and may contain both files and other directories, and are used to

organize collections of files for applications or convenience.

Snapshots

Snapshots are an important part of data-protection plans. A good data-protection plan should

include a backup strategy, storage redundancy provided by RAID levels, and snapshots.

Snapshots provide nearly instantaneous access to previous versions of a file stored on the HP

NAS 8000 HA solution.

A snapshot is a read-only picture of a file volume at a specific point in time. When you create

a snapshot of a file volume, the snapshot initially consumes zero physical space. However, as

users modify the file volume, the snapshot tracks changes between the original file volume and

the modified file volume. If an error occurs and a user needs to revert to the previous version,

the snapshot version of the file can be restored.

Snapshots consume storage space. When planning storage, consider how dynamic your data

will be. With file volumes in which data changes rapidly, snapshots will consume a larger

amount of space. At the extreme limit, a file volume can change so much from the original

information that the snapshot consumes the same amount of space as the original data.

Typically, data does not change so rapidly, and the usage and growth of snapshot space is

relatively slow.

Snapshots are optional and may be created at any time after the basic storage configuration is

complete. Users can add or resize a snapshot at a later time if there is enough free space

available in the volume group.

8 Network and Storage Planning

High Availability

The HP NAS 8000 high availability solution includes a

cluster

, or group, of two NAS servers

that function as a unified system. The cluster is managed by a Quorum server.

The main purpose of high-availability clusters is to provide a higher degree of storage

availability to client systems than is possible with a single server. This is accomplished by

eliminating single points of failure and providing functional redundancy. Uninterrupted service

is provided by failing over file serving capabilities (see “Failover Packages” on page 8) to a

secondary server in the event of a failure in the primary server in the cluster.

■The NAS servers provide failover services for each other.

■The Quorum server manages the NAS servers, or

cluster nodes

, and provides cluster

arbitration services that prevent data corruption.

Clusters

HA Clusters provide a higher degree of storage availability than is possible with a single

server. This is provided by:

■Hardware component redundancy designed to eliminate single points of failure. Each

cluster consists of two or more NAS servers (nodes) plus one Quorum server.

■Software failover capabilities. All storage is controlled by packages which are the smallest

units of failover in the cluster.

Failover Packages

When a package failure is detected, the package is halted and will fail over to another node,

provided that an eligible adoptive node is present. Each package and its associated resources

are monitored independently. This allows failures that are limited to a single package to be

handled without affecting the state of other packages.

The NAS solution supports two failover models:

■Active/Active (or “Dual Active”) means that all cluster nodes can be serving data

simultaneously. The nodes will provide failover services for each other, but can be fully

utilized at all times. This mode is achieved by configuring failover packages to run on both

cluster nodes – effectively dividing the storage between the nodes.

■Active/Passive (or “Single Active”) means that one server is actively serving data while the

other node is in full-time stand-by mode, becoming active only when the other node fails.

This mode can be realized by configuring all of the failover packages and storage to run on

only one node. Without any packages to run, the other node will wait and monitor the other

node for failure.

Network and Storage Planning 9

HA Storage Configuration

This section provides suggestions for organizing your storage for optimizing HA features.

On a direct-attach NAS system without HA features, the simplest way to configure the storage

is to create a single LUN for the entire array and create one volume group with multiple file

volumes beneath it. However, in an HA cluster with two NAS servers, each volume group can

be active on only one NAS server, or

node

, at a time. Therefore, if you are using active/active

failover packages (see “Failover Packages” on page 8), you must create at least two volume

groups so each node can access some of your storage.

In addition, with SAN configurations storage generally resides on several different storage

devices within the SAN. LUNs are created on each array using the SAN management

software. To ensure that a volume group does not become unavailable due to hardware

problems on a specific storage device, the safest configuration is to create a separate volume

group for each LUN.

Note When a volume group includes LUNs from multiple arrays, if any one array has

a hardware failure, the entire volume group will be unavailable. By creating a

separate volume group for each LUN, you are ensuring that only that portion of

the storage residing on the failed array will be unavailable until the array is

restored. All other storage will remain unaffected.

When determining how many LUNs and volume groups to create, consider the following:

■A volume group can be active on only one node at a time.

■A volume group can be assigned to only one failover package.

■File volumes can’t be split between packages or nodes.

■Multiple volume groups can be assigned to the same package.

■A package can only run on one node at a time.

■The HA cluster is limited to 30 packages total (both nodes combined).

■A package is the smallest unit of failover.

■A volume group is the smallest unit of storage that can be failed over.

■If a package contains multiple volume groups and a single volume group, file volume or

even share fails, the entire package will be failed over.

■More packages means a higher degree of granularity to balance the packages between the

nodes and detect failures.

■More packages also results in higher complexity in the cluster configuration and requires

more virtual IP addresses to keep track of.

■The packages should be divided between the cluster nodes such that the storage access

load (from client systems) will be balanced. This may or may not correspond to balanced

storage capacity between the nodes.

The illustrations on the following pages depict three common storage configurations:

■One LUN and one volume group (for active/passive failover).

■Multiple LUNs, volume groups and packages (most common for SAN configurations).

10 Network and Storage Planning

Figure 1 One LUN and One Volume Group for Active/Passive Failover

Figure 2 Multiple LUNs, Volume Groups and Packages

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