Iomega STORCENTER px12-350r Guide de référence rapide

IOMEGA®STORCENTER™px12-350r

STORAGE PROVISIONING AND RAID MIGRATION

CONFIGURATION GUIDE

WHITE PAPER

JUNE 2010

INTRODUCTION 1

AUDIENCE 1

TERMINOLOGY 1

STORAGE PROVISIONING 3

Listing Storage Pools 4

Managing Storage Pools 6

Adding Storage Pools 7

Adding folders 12

Adding iSCSI drives 14

RAID MIGRATION 15

RAID migration by adding more drives 16

RAID 1 migration to RAID 5 17

RAID 5 migration to RAID 6 18

CONCLUSION 19

This white paper describes the flexible and advanced

storage provisioning capabilities available on an

Iomega®StorCenter™px12-350r network storage array.

The paper includes detailed instructions to help users

provision storage and plan for RAID migration.

IOMEGA STORAGE PROVISIONING AND RAID MIGRATION CONFIGURATION GUIDE

INTRODUCTION

The Iomega®StorCenter™px12-350r network storage array offers versatile storage provisioning, advanced

protocol capabilities, expandability and affordability in an easy-to-use product ideal for small business,

workgroups and departments. Based on enterprise-class EMC®storage technology, the StorCenter px12-350r

provides quad gigabit Ethernet connections, direct or network attach, easy file sharing, iSCSI block access,

multiple RAID configurations for optimized data protection, Storage Pools for application flexibility and

expandability to match your budget. Business users will appreciate the robust data protection features such as

UPS support, print serving, Rsync device-to-device replication, and user replaceable hot swap fans, power supplies,

and drives for business continuity and disaster recovery. The easy-to-use interface, Active Directory support, and

remote access provide no-hassle management. The StorCenter px12-350r supports PC, Mac®, Linux®and UNIX

clients and is VMware®certified for NFS and iSCSI and Microsoft Windows Server 2008 R2 (Hyper-V) certified

for iSCSI.

The Iomega px12-350r allows flexible storage provisioning to offer users configuration options based on data

protection, storage utilization, and performance considerations, as well as application requirements. Disks can

be grouped into Storage Pools with or without a RAID protection level. The supported RAID data protection

types include 0, 1, 10, 5, and 6.

An existing Storage Pool with certain RAID protection types can be migrated by adding more disks while data is

online. Moreover, a Storage Pool with certain RAID types can be migrated to some other RAID types while data is

online. During the migration, the RAID group will be reconstructed but data will be continuously available,

although I/O to the Storage Pool could be significantly slowed down during the reconstruction.

This document describes the supported RAID types and storage provisioning options available on an Iomega

px12-350r, and the RAID migration paths that are permitted. The paper includes detailed instructions to help

users provision storage and plan for RAID migration.

AUDIENCE

Information contained in this white paper is intended for Iomega customers, partners, and service personnel

involved in provisioning storage on an Iomega StorCenter px12-350r network storage array.

TERMINOLOGY

RAID: Redundant Array of Independent Disks. RAID is a technology that allows high levels of storage reliability

from low-cost and less reliable disks via the technique of arranging the disks into arrays for redundancy.

JBOD: Just a Bunch Of Disks. In this mode, all disks are addressed independently with no collective properties

and the disks are concatenated to be presented as a single logical disk.

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RAID 0: this RAID level distributes data across multiple disks in a way that gives improved speed at any given

instance. If one disk fails, however, all the data on the array will be lost, as there is neither parity nor mirroring.

RAID 0 is non-redundant. A RAID 0 array requires a minimum of two drives.

RAID 1: this RAID level mirrors the contents of the disks, making a form of 1:1 ratio real-time backup. The contents

of each disk in the array are identical to that of every other disk in the array. A RAID 1 array requires a minimum of

two drives.

RAID 5: this RAID level combines three or more disks in a way that protects data against loss of any one disk.

Fault tolerance is achieved by calculating parity and distributing parity to all disks. Distributed parity requires all

drives but one to be present to operate; drive failure requires replacement, but the array is not destroyed by a

single drive failure. Upon drive failure, any subsequent reads can be calculated from the distributed parity, such

that the drive failure is masked from the end user. The array will have data loss in the event of a second drive

failure and is vulnerable until the data that was on the failed drive is rebuilt onto a replacement drive. A single

drive failure in the set will result in reduced performance of the entire set, until the failed drive has been replaced

and rebuilt.

RAID 6: this RAID level combines four or more disks in a way that protects data against loss of any two disks.

Fault tolerance is achieved by calculating dual parity and distributing them to all disks. Distributed dual parity

requires all drives but two to be present to operate.

RAID 10 (or 1+0): this RAID type is a mirrored data set (RAID 1) which is then striped (RAID 0), hence the “10”

name. RAID 10 normally requires a minimum of four drives: two mirrored drives to hold half of the striped data,

plus another two mirrored for the other half of the data.

CIFS: Common Internet File System, also known as Server Message Block (SMB). It operates as an application-

layer network protocol mainly used to provide shared access to files, printers, serial ports, and miscellaneous

communications between nodes on a network. It also provides an authenticated inter-process communication

mechanism. Most usage of CIFS involves computers running Microsoft Windows.

Network File System (NFS): A distributed file system providing transparent access to remote file systems.

NFS allows all network systems to share a single copy of a directory.

iSCSI: Internet Small Computer System Interface. This is a protocol for sending SCSI packets over a TCP/IP

network.

SCSI: Small Computer System Interface. Standard set of protocols for host computers communicating with

attached peripherals.

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IOMEGA STORAGE PROVISIONING AND RAID MIGRATION CONFIGURATION GUIDE

LUN: Logical Unit Number. Identifying number of a SCSI or iSCSI object that processes SCSI commands. The LUN

is the last part of the SCSI address for a SCSI object. The LUN is an ID for the logical unit, but the term is often

used to refer to the logical unit itself.

Storage Pool: a unit of provisioning. A Storage Pool contains a set of disk drives using a common data protection type.

Folder: on an Iomega px12-350r, a folder is a file system directory that can be accessed by hosts using file sharing

protocols, including NFS and CIFS. A folder resides in a single Storage Pool.

iSCSI Drive: on an Iomega px12-350r, an iSCSI drive is an iSCSI LUN that resides in a single Storage Pool.

SATA: Serial Advanced Technology Attachment. This is a storage interface for connecting host bus adapters to

mass storage devices, such as hard disk drives and optical drives.

STORAGE PROVISIONING

An Iomega px12-350r network storage array contains a maximum of twelve drives which can be grouped into one

or more Storage Pools. At least one Storage Pool must exist before any folders or iSCSI drives can be created.

A Storage Pool can be configured in the JBOD mode without any data protection, or be configured in one of the

supported RAID protection types. The RAID types available on an Iomega px12-350r are RAID 0, RAID 1, RAID

10, RAID 5, and RAID 6.

The Iomega px12-350r provides a graphical representation of the device enclosure, the drives, and their layout in

the enclosure. This graphical representation makes complex storage provisioning jobs much more intuitive and

easier to understand. When mousing over either a Storage Pool listed in the pool table or one of the drives

belonging to a pool, all drives in the same Storage Pool are highlighted in the graphical representation to clearly

illustrate how the Storage Pool is constructed. Faulted disks or Storage Pools are displayed with an alert icon or

with an error icon. When a Storage Pool is degraded or faulted, the Storage Pool is grayed out to prevent

modification.

In this white paper, an Iomega px12-350r device with twelve 1TB drives is used for illustration purpose.

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IOMEGA STORAGE PROVISIONING AND RAID MIGRATION CONFIGURATION GUIDE

Listing Storage Pools

1. To view Storage Pools, go to Settings > Storage Pools.

2. The Iomega px12-350r supports up to 12 SATA disks. The drives and their layout inside the device enclosure

are shown in a graphical representation. Each drive is numbered.

Figure 1 Storage Pools UI

3. Click Details to view drive information.

Figure 2 Detailed drive information

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4. Each hard drive contains a small amount of on-disk write cache. Using the write cache can help improve write

performance in some cases. However, data integrity may be at risk when the device loses power in the middle

of I/O, yet cached data has not been committed to the drive. Therefore, the best practice is to enable write

caching only when the Iomega device is protected by UPS. This is a global setting that applies to all drives.

Figure 3 Configure write caching

5. If a drive slot has no drive inserted, the slot is shown empty.

Figure 4 Drive slot without a drive

IOMEGA STORAGE PROVISIONING AND RAID MIGRATION CONFIGURATION GUIDE

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Managing Storage Pools

The StorCenter px12-350r is ordered and shipped with four drives. By default, one Storage Pool is created using

all four drives in the RAID 5 protection mode as shown below. Additional drives can be ordered in expansion

packs but will not be constructed in any Storage Pool.

Figure 5 Array initial provisioning

Characteristics of the Storage Pool and the drives in the enclosure are displayed in the table and the graphical

representation of the enclosure.

Name – the name of the Storage Pool; by default it is called “SP1” during initial provisioning. A Storage Pool is

assigned a letter starting from capital “A”. The letter is associated with all the drives that belong to the pool.

Protection – the RAID protection level of the Storage Pool.

Capacity – total capacity of the Storage Pool; it is the sum of allocated storage and free storage.

clicking the information icon will display information relevant to the pool: space allocation and usage,

data protection, name, and a list of folders and iSCSI drives that are created in the pool.

clicking the edit icon will allow modification of the pool properties: name, data protection, and RAID migration.

clicking the garbage icon will remove the Storage Pool. The drives are released and all data in the pool

is deleted.

IOMEGA STORAGE PROVISIONING AND RAID MIGRATION CONFIGURATION GUIDE

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Adding Storage Pools

For illustration purpose, the default initial Storage Pool is removed so that all twelve drives are available for

Storage Pool creation to demonstrate the flexible provisioning options.

1. Go to Settings > Storage Pools and click the icon to create a new Storage Pool. By default all drives that do

not belong to any existing Storage Pool are checked for use.

Figure 6 Add a Storage Pool

2. Select drives to include in the new Storage Pool, then name the pool.

Figure 7 Select drives for the new Storage Pool

IOMEGA STORAGE PROVISIONING AND RAID MIGRATION CONFIGURATION GUIDE

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3. Choose a RAID level for the Protection type. On the Iomega px12-350r, the following data protection types are

available in the Protection selection box.

Figure 8 Choose data protection type

tDouble Parity (RAID 6) – the pool must contain at least 4 drives.

tParity (RAID 5) – the pool must contain at least 3 drives.

tMirror (RAID 10) – the pool must contain at least 2 drives.

tNone (RAID 0) – the pool must contain at least 2 drives.

tNone – the pool can contain one or more drives, and the drives are in a JBOD mode without data protection.

Note: the Protection dropdown box does not list RAID 1 explicitly. However, when only two drives are selected and

the RAID 10 option is chosen, the Storage Pool is effectively built into the RAID 1 mode.

IOMEGA STORAGE PROVISIONING AND RAID MIGRATION CONFIGURATION GUIDE

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Level

RAID 0

RAID 1

RAID 10

Description

Striped set without parity or Striping. Provides improved

performance and additional storage but no redundancy

or fault tolerance. Because there is no redundancy, this

level is not actually a Redundant Array of Inexpensive

Disks, i.e. not true RAID. However, because of the

similarities to RAID (especially the need for a

controller to distribute data across multiple disks),

simple stripe sets are normally referred to as RAID 0.

Any disk failure destroys the array, which has greater

consequences with more disks in the array (at a

minimum, catastrophic data loss is twice as severe

compared to single drives without RAID). A single disk

failure destroys the entire array because when data is

written to a RAID 0 drive, the data is broken into

fragments. The number of fragments is dictated by the

number of disks in the array. The fragments are written to

their respective disks simultaneously on the same sector.

This allows smaller sections of the entire chunk of data to

be read off the drive in parallel, increasing bandwidth.

RAID 0 does not implement error checking so any error

is unrecoverable. More disks in the array means higher

bandwidth, but greater risk of data loss.

Mirrored set without parity or Mirroring. Provides fault

tolerance from disk errors and failure of all but one of

the drives. Increased read performance occurs when

using a multi-threaded operating system that supports

split seeks, as well as a very small performance reduction

when writing. Array continues to operate so long as at

least one drive is functioning. Using RAID 1 with a

separate controller for each disk is sometimes called

duplexing.

Striped set of mirrors. Provides both disk replication

and data sharing by combining the benefits of RAID 0

and RAID 1.

Min. #

of Disks

Space

Efficiency

(size of the

smallest disk)

n/2

Fault

Tolerance

0 (none)

n-1 disks

n/2 disks,

one from

each mirror

set

DISK 0

RAID 0

DISK 1

DISK 0

RAID 1

DISK 1

RAID 1

RAID 10

RAID 0

RAID 1

The following table compares the different RAID levels. For more details, refer to http://en.wikipedia.org/wiki/RAID.

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