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1. Powervault™ 220S & 221S Storage Enclosure

A REFERENCE GUIDE FOR OPTIMIZING DELL™ SCSI SOLUTIONS

RAID 5

RAID 5 has good I/O performance, data protection and relative cost with excellent storage

capacity.

required along with a moderate amount of data protection.

RAID 50

A balance between RAID 5 and RAID 10, this solution offers good I/O performance,

availability and good storage capacity. This configuration offers slightly higher

performance than RAID 5, but at a slightly higher cost and reduced storage capacity. It

does however provide greater storage capacity than a RAID 10 solution with a decrease in

performance and data protection.

redundancy and data protection is required as well as reasonable storage capacity.

Note: For more details on RAID configurations refer to the Dell™ 'Getting Started with

RAID' document (http://support.dell.com/support/edocs/storage/RAID/RAIDbk0.pdf).

Concatenated Container

This solution is not recommended due to lack of data protection and redundancy and no

performance gain. However for non-critical implementations that require high scalability

this type of solution will provide more ease of use than other RAID configurations.

Application specific guidelines

E-Mail Servers

The storage requirements for e-mail servers can vary depending on the size, the amount,

and type of users. While small departmental e-mail servers may work well with a small

amount of storage and limited features; large corporate e-mail servers normally require

greater storage capacity, very high availability, performance and scalability. IO profiles will

vary depending on the number of users and type of mail and attachments sent.

I/O Profile

(Read/Write)

(Sequential/Random)

60/40

Application

E-Mail

Recommended:

PAGE 6

RAID 5 should be used in situations where maximum storage capacity is

• Table 2-3: Email Server General I/O profile

I/O Profile

Bandwidth

Random

Heavy

• Table 2-4: Email Sever RAID Guidelines

Concatenated

Recommended

This should be used in situations where greater

I/O

Latency

Size

Sensitivity

High

RAID Level

Not Recommended

VER A02

Growth

Critical

Rate

ity

High

Possible

11/17/2005