ATTO EPCI-PWRC-000 Informations techniques télécharger pdf (Page 5)

ATTO Technology Inc. ATTO Express Power Center Installation and Operation Manual

2.0 RAID Level 0 Overview

Originally Redundant Array of Inexpensive Disks, now Redundant Array of Independent Drives, RAID is a storage

system using multiple disk drives. ATTO Express Power Center Utility creates a virtual disk using two or more

physical drives to increase capacity and performance.

Large amounts of data can be supported over many

smaller drives when the drives are combined into one

large “virtual” drive. Management is easier because,

instead of several drives to consider when deploying

data as in a JBOD (Just a Bunch of Disks)

configuration, the system only has one address or

LUN on a storage bus or network.

RAID overlaps disk seeks, minimizing aggregate seek

time delays for the storage group as a whole. Data is

written in equal, short operations to each member of

the RAID group in turn so that when the first member

of a group begins writing to disk, the second member

is available to take data. This continues until the last

member of a group is writing to disk, and the first

member of a group is ready for data.

RAID Level 0 is commonly used when performance is

more important than data protection. RAID Level 0, or

striping, achieves higher I/O performance by breaking

data into smaller units (volumes), then writing the data

to separate physical drives. These striped volumes

can then be read from the separate, physical drives,

and re-assembled into the actual data. You must have

at least two physical drives to create a striped volume.

ATTO recommendations

• Although RAID Level 0 volumes can be created

among different types and models of drives, use

similar types/models to ensure access time will

be equal to the average access time of a single

drive rather than the access time of the slowest

drive.

• For maximum performance, use a multi channel

host adapter with drives equally distributed

across busses.

• Use RAID 0 in environments that demand high

I/O rates such as video production and editing,

image editing and prepress.

• Since RAID 0 does not provide fault tolerance,

establish a backup policy to protect data stored

on RAID 0 volumes.

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ATTO EPCI-PWRC-000 Informations techniques Page 5

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