Dell PowerVault NX3500 Guide de démarrage rapide

DELL POWERVAULT NX3500

A Dell Technical Guide

Version 1.0

DELL PowerVault NX3500, A Dell Technical Guide

THIS TRANSITION GUIDE IS FOR INFORMATIONAL PURPOSES ONLY, AND

MAY CONTAIN TYPOGRAPHICAL ERRORS AND TECHNICAL INACCURACIES.

THE CONTENT IS PROVIDED AS IS, WITHOUT EXPRESS OR IMPLIED

WARRANTIES OF ANY KIND.

any manner whatsoever without the express written permission of Dell

Inc. is strictly forbidden. For more information, contact Dell.

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PowerVault are trademarks of Dell Inc. Microsoft, Windows, Windows

Server and Hyper-V are either trademarks or registered trademarks of

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Other trademarks and trade names may be used in this document to

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Apr. 2011

DELL PowerVault NX3500, A Dell Technical Guide

Contents

1. Product Overview ..........................................................................................2

2. PowerVault NX3500 Clustered Solution........................................................3

3. PowerVault NX3500 Solution Architecture....................................................4

4. PowerVault NX3500 NAS Volumes...............................................................4

5. PowerVault NX3500 Physical Configuration .................................................5

6. Controllers......................................................................................................6

7. Cache.............................................................................................................6

8. Backup Power Supply....................................................................................6

9. PowerVault NX3500 Software Tools .............................................................6

10. NAS Replication.............................................................................................8

11. PowerVault NX3500 hardware, environmental, and technical specifications9

12. Networking.....................................................................................................11

13. Configuration Overview .................................................................................12

14. PowerVault NX3500 system glossary ...........................................................13

DELL PowerVault NX3500, A Dell Technical Guide

1. Product Overview

The PowerVault NX3500 adds scale-up NAS capability to PowerVault

MD32x0iand MD36x0i storage to create a scale-up Unified Storage

solution. It is an easy-to-use solution for smaller-scale deployments

with increasing iSCSI, NFS and CIFS-based data storage needs. With the

PowerVault MD backend, you can scale storage of CIFS, NFS and iSCSI-

based data up to 192 TB of capacity. As your storage needs increase,

you can add or modify block and file capacity dynamically as needed

without disrupting your existing applications and storage systems.

The PowerVault NX3500 incorporates Dell Scalable File System, a high

performance, high availability file system based on proven technology.

The PowerVault NX3500 also offers affordable data protection features,

including user-restorable snapshots, asynchronous replication, and

NDMP backup capabilities.

The PowerVault NX3500 Difference

Today, a majority of organizations store and manage block and file

data on separate, non-integrated storage systems. Both SAN (Storage

Area Network, primarily Fibre Channel, and iSCSI) and NAS (Network

Attached Storage, primarily CIFS and NFS) can be used to store

unstructured data, but traditionally IT environments have selected NAS

for unstructured data. NAS storage provides a consistent file system

that allows the same storage space to be accessed by multiple

heterogeneous clients.

Unified Storage combines SAN and NAS protocols in the same physical

hardware chassis and typically has a single management interface. As

unstructured (file) data continues to grow, several challenges with this

approach have emerged. Spikes in NAS storage demand can cause SAN

performance bottlenecks. Unified Storage typically is priced like SAN,

which costs much more in $/GB than traditional NAS. Also, traditional

Unified Storage typically has rigid architectural boundaries that limit

file size, number of files, and size of the file system. Forklift upgrades

to the next generation of Unified Storage require tedious data

migration and often weeks of application and storage network

downtime.

A file system is a software layer running on the controller that manages

how the data is stored and accessed. Because the file system manages

data access, and functions like an operating system for the controller,

its architecture and design directly impact storage system scalability

and performance.

Dell Scalable File System (DSFS), incorporated in PowerVault NX3500, is

uniquely scalable. Based on a scale-out architecture with full

redundancy and no single point of failure, it is designed to present a

storage pool as a single file system with a single IP address to the

client(s) in a flat network topology, or with multiple IP addresses to

clients in a routed network.

Transition Guide for PowerVault MD3200i and MD3220i Series Arrays

Dell Scalable File System is essentially a distributed file system, with

volume management, cluster management for transparent failover, and

non-disruptive scalability. Its interconnect technology delivers virtually

unlimited scalability for both performance and capacity, independent

of each other. DSFS uses cache efficiently to provide fast, highly

reliable reads and writes. Overall, DSFS is designed to optimize file

access performance and hardware utilization while eliminating the

capacity constraints of Windows-based file systems.

Because it can store block, CIFS, and NFS protocol data on the same

hardware without the constraints of traditional Unified Storage, the

PowerVault NX3500 is a flexible and practical alternative to Windows

file servers. And, it features a comprehensive and intuitive file

management system that can help you reduce the time it takes to

create and manage multiple volumes and shares.

2. PowerVault NX3500 Clustered Solution

The PowerVault NX3500 is deployed as a clustered NAS solution that

aggregates multiple storage controllers and presents a NAS storage pool

to UNIX, Linux and Windows clients as one virtual file server. This is an

enterprise-class storage solution, optimal for a wide range of

applications and deployment environments.

PowerVault Unified Storage Solution –High Level Logical Diagram

Transition Guide for PowerVault MD3200i and MD3220i Series Arrays

3. PowerVault NX3500 Solution Architecture

The PowerVault NX3500 system is based on a NAS gateway architecture

with the hardware residing on three physically separate components:

•PowerVault NX3500 controller0

•PowerVault NX3500 controller1

•Backup power supply

oA unified storage system based on the PowerVault NX3500 and

MD3xx0i hardware would include:

•Two PowerVault NX3500 controllers with 12 GB cache per controller

•Backup power supply

•iSCSI-based storage, the NX3500 system currently supports 1 MD3xx0i array

and multiple MD120x0 expansion shelves

•iSCSI connections

•Two internal networks

•Client network

4. PowerVault NX3500 NAS Volumes

A NAS volume is a subset of the file system and comprises a virtual unit

of storage capacity that is less than or equal to the total available

space. The minimum size of a NAS volume is 20 MB and the maximum

size is the total amount of available space on the backend storage

system. You can increase the capacity of a NAS volume without

impacting data access or bringing down your SAN.

You may choose to create one large NAS volume or, alternatively, you

can use multiple NAS volumes (creating, growing, and deleting them as

required). The PowerVault NX3500 supports up to 512 NAS volumes per

solution. The size of a file system can be increased at any time but may

not be decreased in the initial release of the product. However, NAS

volume size may be increased or decreased anytime. To make NAS

volumes available to users, each volume must be shared (CIFS) or

exported (NFS) separately. Users need to specifically map or mount

each share.

Transition Guide for PowerVault MD3200i and MD3220i Series Arrays

NAS System Diagram

NAS Shares

NAS file shares are the final export of the NAS storage to the user. One

NAS volume can have multiple file shares and shares can be either CIFS,

NFS or mixed-protocol (CIFS and NFS). File share access can be fully

managed to enable default or controlled access based on user name or

by defining trusted users and client machines that can access NFS

export directories.

5. PowerVault NX3500 Physical Configuration

The NX3500 is available in a 3U rack mount configuration:

•1U PowerVault NX3500 controller0

•1U PowerVault NX3500 controller1

•1U Backup power supply shelf (with two backup power supplies)

PowerVault NX3500

Transition Guide for PowerVault MD3200i and MD3220i Series Arrays

6. Controllers

In the clustered solution, each PowerVault NX3500 controller has two

connections to the client network: two connections to the storage area

network and two controller back-to-back connections for the cluster's

internal network. Each controller is protected by a backup power

supply (BPS), which protects data during power failure.

PowerVault NX3500 software, installed on each of the controllers,

consists of an operating system, volume management, Dell Scalable

File System, and Dell’s advanced clustering technology. A virtual IP

address provides access to the PowerVault NX3500 system.

The PowerVault NX3500 is equipped with a built-in traffic load

balancing mechanism. Read/write operations are handled through

mirrored Non-Volatile RAM (NVRAM). Cache data is mirrored between

the paired NAS controllers. This assures a quick response to clients'

requests while maintaining data integrity. Data from the cache to

permanent storage is transferred asynchronously according to a variety

of optimized data-placement schemes.

7. Cache

Each controller is equipped with 12 GB of RAM, most of which is used

for caching to boost performance. Writing or modifying files occurs first

in the cache. Data is then mirrored to the peer controller’s cache. This

feature ensures that all transactions are duplicated and secured.

8. Backup Power Supply

Each controller receives its power from a dedicated BPS and from the

power grid. The BPS has sufficient battery power to allow the

controller to execute orderly shutdown, thus enabling the cache to be

used as NVRAM. Each controller regularly monitors the BPS battery

status and requires the BPS to maintain a minimum level of charge for

normal operation.

9. PowerVault NX3500 Software Tools

The PowerVault NX3500 solution includes configuration and

management tools, as well as snapshot and replication software.

Configuration and management of the PowerVault NX3500 solution uses

the following three tools:

PowerVault Modular Disk Storage Manager (MDSM) handles block

storage configuration and management, including the provisioning of

MD3xx0i storage for NAS.

PowerVault NAS Configuration Utility (NASCU) guides you through

network configuration and pairing the PowerVault NX3500 NAS

controllers together. It will also start the process of pairing the system

Transition Guide for PowerVault MD3200i and MD3220i Series Arrays

to the PowerVault MD3xx0i storage appliance. It is recommended that

administrators determine their network configuration and IP allocation

for their NAS controllers before executing NASCU.

PowerVault NX3500 NAS Manager lets you configure NAS network IP

addresses and create and manage volumes and shares. You also use the

NAS Manager to set up snapshots and replication, engage NDMP backup,

and monitor NAS file system performance.

PowerVault NX3500 NAS Manager

Dell Scalable File System (DSFS) Snapshots

You can use snapshots to restore files or volumes back to a previous

state. Snapshots are also used with data protection features such as

backup and replication to provide consistent copies of a production file

system without stopping access to the production file system. Snapshot

policies are applied at the NAS volume level. When the first snapshot of

a NAS volume is created, all snapshots created after the baseline

snapshot will be a delta from the previous snapshot. DSFS uses a

Redirect-on-Write Snapshot design: Each snapshot creates a thin copy

by saving only the differences rather that a full copy of the file system.

Transition Guide for PowerVault MD3200i and MD3220i Series Arrays

DSFS Snapshots

10.NAS Replication

Block-based NAS replication is a feature that uses snapshot technology

in the PowerVault NX3500 file system. Replication is volume-level and

can be used to replicate volumes on the same or another PowerVault

NX3500 system. After the initial replication, changes to the stored data

are recorded to the target volume.

When replicating a volume to another PowerVault NX3500 system, you

must set up the other system as a replication partner. Once a partner

relationship is established, replication is bi-directional: one system can

hold target volumes for the other system as well as source volumes that

are replicated to the other system. You can set up replication policies

to run on various schedules as well as on demand.

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