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Dell DX Object Storage – File Gateway Architectural Reference

Page ii

Release

Version Date Details Modifie

Released By

0.01 12/8/2010 Initial draft Ron Stefani

Not Released

0.02 12/14/2010 Sizing Guidelines added

Ron Stefani

Not Released

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ERRORS AND TECHNICAL INACCURACIES. THE CONTENT IS PROVIDED AS IS, WITHOUT EXPRESS OR

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Linux is a trademark of Red Hat, Inc., registered in the U.S. and other countries. Linux is the registered

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used in this document to refer to either the entities claiming the marks and names or their products.

Dell Inc. disclaims any proprietary interest in trademarks and trade names other than its own.

December 2010

Dell DX Object Storage – File Gateway Architectural Reference

Page 2

Contents

Scope of this Document................................................................................................ 3

Overview ................................................................................................................. 3

Standard hardware...................................................................................................... 3

Specific CFS Configurations............................................................................................ 4

Single-server Configuration......................................................................................... 4

Hardware............................................................................................................ 4

Network ............................................................................................................. 4

Failover Configuration............................................................................................... 5

Hardware............................................................................................................ 5

Network ............................................................................................................. 6

Gateway Protocols ................................................................................................... 6

Other hardware....................................................................................................... 7

Software ............................................................................................................... 7

DX Object CFS Processes............................................................................................... 8

Standard DX Object Storage Cluster............................................................................... 8

DX Object Storage File Gateway (single-server) ................................................................ 9

DX Object Storage File Gateway (Failover) ..................................................................... 10

Sizing Guidelines .......................................................................................................11

Availability ...........................................................................................................11

Number of Clients...................................................................................................11

Amount of External Storage .......................................................................................11

Dell DX Object Storage – File Gateway Architectural Reference

Page 3

Scope of this Document

This document provides an overview of the Dell DX Object Storage CFS Gateway solution and lists the

hardware and software components that are used in the solution.

For more detailed information about deploying this solution or any of its components, see

support.dell.com.

Overview

The Dell DX Object Storage platform, initially released in May 2010, integrates applications via native

HTTP writes. The DX Object Storage Gateway solution extends access to DX Object Storage by adding a

file system interface that supports Windows & UNIX clients.

The interface is provided by CIFS/NFS software that runs on a PowerEdge R410 server. In the Gateway

solution this is called the Cluster File Server (CFS), and it provides a file system interface that enables

customers to write files to DX Object Storage as they would any other file system. The write to the DX

Object Storage system is indirect, however, as the files temporarily reside in spool cache on the CFS

server or on a shared storage device.

In a single-server Gateway solution, data objects are written to a spool that is on the CFS and then

moved to a storage node in the DX Object Storage cluster once the write is complete; in a failover

configuration, the files are written to a Dell PowerVault MD3200i storage system, which persists the

data in the event that a CFS fails. See “Specific CFS Configurations” for more details.

Standard hardware

The following briefly describes the standard hardware components of DX Object Storage Gateway

solutions. In most cases, none of these components are yet installed at the customer site.

Cluster File Server (CFS) – This server hosts the file server software that presents the Dell DX

Object Storage system as a standard file system. In single-server solutions, this server also

provides a spool cache on local disk.

Cluster Services Node (CSN) – This node is the head of the DX Object Storage systems and

hosts the services that run on the cluster, such as cluster services, storage services, and

content router (if applicable). It is not used for data storage.

Storage Nodes – These nodes host data that is indirectly written to them by application servers

(via the spool cache). A minimum of two nodes is required, and each data object has at least

one replica.

Shared Storage System – Shared storage is a cache where files are stored before they get

written to the DX Object Storage and also where they can be accessed on subsequent reads, if

locally available. A separate shared storage system, such as the MD3200i is required for failover

solutions. In these types of solutions, if the gateway server fails over to another gateway

server, the common spool cache is still available to either write its data to the storage nodes,

or serve data to clients.

Dell DX Object Storage – File Gateway Architectural Reference

Page 4

Specific CFS Configurations

CFS configurations front-end a DX Object Storage cluster that has a CSN and at least two storage nodes.

There are two types of CFS configurations offered – single server (no failover) and high availability

(failover). A failover solution is recommended in environments that require high performance and/or

have large file system configurations.

Single-server Configuration

The minimal CFS configuration is a single CFS server the uses internal storage for storing the spooled

data and namespace. This configuration is recommended when CFS failover is not required and when

the spooled data and namespace capacity requirements are less than 1TB.

Hardware

(1) PowerEdge R410 server

oChassis: Up to four Hot-Plug Hard Drives, LCD diagnostics

oProcessor(s): 2 x E5620, 2.4GHz 12M Cache, Turbo, HT, 1066MHz Max Mem

oMemory Configuration: 24GB Memory (6x4GB), 1066MHz Dual Ranked RDIMMs for

Processors, Optimized

oHDD Configuration: RAID1/RAID1 hard drive configuration

oHard Drives:

(2) 500GB 7.2K RPM Near-Line SAS 3.5in HDD for OS and application

(2) 1TB 7.2K RPM Near-Line SAS 3.5in HDD for spooled data and namespace

oPrimary Controller: SAS 6.iR SAS internal RAID adapter for Hot Plug Configuration, PCI-

Express

oPSU: 500Watt Redundant power supplies

oEmbedded Management: iDRAC6 Enterprise

oNetwork Adapter: Broadcom NetXtreme II 5709 Gigabit NIC w/TOE & iSOE, Quad Port,

Copper, PCIe-4

oDVD-ROM Drive

oOperating System: RHEL 6 X64 Basic with 3 Year Subscription

Network

The CFS server is configured with one Broadcom dual port BCM 5716 controller and one Broadcom quad

port NetExtreme II 5709 GbE controller for a total of six GbE ports. The recommended network port

allocation for a single CFS configuration is:

Connect NIC ports 0 and 1 to the CIFS/NFS network.

Connect NIC ports 3 thru 5 to the DX Storage Cluster network.

Dell DX Object Storage – File Gateway Architectural Reference

Page 5

Failover Configuration

The failover configuration allows CFS servers to be deployed in pairs so that if one server fails, the

share can be recovered by the other CFS server to minimize recovery time. In this configuration, the

CFS servers utilize iSCSI storage to store spooled data.

Hardware

This configuration consists of the following hardware:

(2) PowerEdge R410 servers

oChassis: Up to four Hot-Plug Hard Drives, LCD diagnostics

oProcessor(s): 2 x E5620, 2.4GHz 12M Cache, Turbo, HT, 1066MHz Max Mem

oMemory Configuration: 24GB Memory (6x4GB), 1066MHz Dual Ranked RDIMMs for

Processors, Optimized

oHDD Configuration: RAID 1 configuration; internal drives in RAID 1 for OS and

application; spooled data and namespace stored on iSCSI

oPrimary Controller: SAS 6.iR SAS internal RAID adapter for Hot Plug Configuration, PCI-

Express

oHard Drives: (2) 500GB 7.2K RPM Near-Line SAS 3.5in HDD

oPSU: 500Watt Redundant power supplies

oEmbedded Management: iDRAC6 Enterprise

oNetwork Adapter: Broadcom NetXtreme II 5709 Gigabit NIC w/TOE & iSOE, Quad Port,

Copper, PCIe-4

oDVD-ROM Drive

oOperating System: RHEL 6 X64 Basic with 3 Year Subscription

(1) iSCSI Storage: MD3200i

o Controllers: Single or Dual controller options

o Hard Drives: Up to 12 3.5in HDD with the following HDD options

-500GB near-line SAS 6GB, 7.2K, 3.5in HDD

-300GB SAS 6GB, 15K, 3.5in HDD

-450GB SAS 6GB, 15K, 3.5in HDD

-600GB SAS 6GB, 15K, 3.5in HDD

-2TB near-line SAS 6GB, 7.2K, 3.5in HDD

o HDD Configuration: RAID5

Dell DX Object Storage – File Gateway Architectural Reference

Page 6

Network

For a failover CFS configuration, the iSCSI storage can be on its own switch isolated from the DX

Storage Cluster or it can be attached to the DX Cluster network. In cases where iSCSI storage is

attached to the DX Cluster network, then ports 2 thru 5 can be shared between the iSCSI storage and

DX Storage Cluster. In this configuration, it is recommended to configure network ports for adaptive

load balancing. Sites that have suitable competence may prefer configuration and management of link

aggregation control protocol in place of adaptive load balancing.

The preferred failover network configuration is identical to that shown for a single-server CFS

configuration (above), except that iSCSI traffic will share the four NIC ports that go to the private DX

Storage network. If a site wishes to use pre-existing iSCSI storage that is available on its own VLAN,

then the recommended network port allocation is:

Connect NIC ports 0 and 1 to the CIFS/NFS network.

Connect NIC ports 2 and 3 to the DX Storage Cluster network.

Connect NIC ports 4 and 5 to the iSCSI Storage network.

Gateway Protocols

The CFS can be configured for NFS or SMB/CIFS gateways. For SMB/CIFS, users and groups can access

the system through standalone authentication, or if Active Directory Services exists, users and groups

can be authenticated through the existing ADS structure. For NFS, Dell supports version 3 only; it does

not support version 4.

Dell DX Object Storage – File Gateway Architectural Reference

Page 7

Other hardware

The following briefly describes the hardware components that are required to work as part of DX

Object Storage Gateway solutions. They may already be present in the customer environment, or

ordered as part of the solution.

Network Switch(es) – Configuring the solution requires extensive knowledge of how the

customer uses switches to segment VLANs. Some customers may run each VLAN through a

separate switch, and some may segment a switch for multiple VLANs.

Application Server(s) – These servers write data to the spool cache storage in the Gateway

solution. In a non-gateway DX Object Storage solution, they write directly to the storage nodes.

Domain Controller – This server manages logins, authentication, groups and permissions.

Domain controller information is an essential part of setting up a gateway solution.

Software

The following briefly describes the standard software components for DX Object Storage Gateway

solutions.

Red Hat Enterprise Linux – This is the operating system that resides on the Cluster Services

Node and the CFS Server. Different versions may run on the CFS Server and the CSN. See the

interoperability matrix for information about versions.

CFS – This is the software on the CFS Server that presents Dell DX Object Storage to clients as a

common file system.

Cluster Services – These services reside on the CSN and enable you to configure the CSN,

define user access, set parameters for backup and restore, and define SCSP Proxy settings.

Content Storage – These services reside on the CSN and enable you to define properties,

licensing, and user access for the whole cluster.

Content Router – These services provide replication of content between remote clusters and

enumeration of DX Object Storage content for other purposes like search indexing or virus

scanning. Content Router is not required if the cluster is not replicating to a remote cluster.

Dell DX Object Storage – File Gateway Architectural Reference

Page 8

DX Object CFS Processes

The data flow in a DX Object Storage File Gateway depends on the type of configuration. The following

examples show, a standard DX Object Storage cluster (for reference purposes), a DX Object Storage

cluster with a single-server gateway, and a DX Object Storage cluster with a failover gateway.

Standard DX Object Storage Cluster

In a basic, standalone DX Object Storage cluster (see Figure 1), an application server writes a data

object directly to a storage node, and the Cluster Services on the CSN refers to its configuration

settings and then tells the object how many times it must replicate.

Figure 1. Standalone DX Object Storage Cluster

Storage Node

Application Server

Write

Replicate

Storage Node

Cluster Services Node

Cluster Services

Storage Services

Dell DX Object Storage – File Gateway Architectural Reference

Page 9

DX Object Storage File Gateway (single-server)

In a DX Object Storage File Gateway, data objects are written to a CFS server before being written to a

Storage Node. In this configuration, the application server and clients are actually viewing objects as

they reside in the spool cache of the CFS server. These objects are presented to the end user as part of

a file system.

Figure 2. DX Object Storage File Gateway (single-server)

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