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PERC 5 architecture

3.2 GB/sec

1 GB/sec

peak

Bottleneck

throughput

Intel

LSISAS1068

DDR2-400

IOP333

controller IC

processor

PCI-X

x8 PCIe

2 GB/sec

peak

throughput

Figure 1.

Dell PERC 5 and PERC 6 controller architectures

deployment with Dell PowerVault storage,

and flexible RAID configuration and man-

agement tools. The controllers support

Microsoft® Windows Server® 2003 with

Service Pack 1 (SP1) (32-bit and 64-bit),

Microsoft Windows Server 2008 (32-bit

and 64-bit), Red Hat® Enterprise Linux® 4

Update 5 and Red Hat Enterprise Linux 5

(32-bit and 64-bit), Novell® SUSE® Linux

Enterprise Server 10 (64-bit), Microsoft

Windows® XP with SP2 (32-bit and 64-bit),

and Microsoft Windows Vista® (32-bit and

64-bit) operating systems.

enhanced performance

The PERC 6 is designed to increase per-

formance in each of the four key areas

that can affect controller performance:

hardware features, caching policies, read

and I/O policies, and software features.

Each is important and should be consid-

ered when evaluating a RAID controller in

a host server along with other server fea-

tures that may affect performance, such

as the OS and hard drives.

Organizations should also keep in

mind that different applications display

different workload characteristics, and

that these workload footprints can affect

server performance. However, many

applications can be categorized as having

a sequential read/write profile or a

random read/write profile. Sequential

read/write applications typically include

PERC 6 architecture

Over 4 GB/sec

peak

throughput

CPU

DDR2-667

3 Gbps

complex

SAS

x8 PCIe

2.4 GB/sec

2 GB/sec

peak throughput

Host

chipset

CPU

media streaming, backup and restore,

and network attached storage and near-

line storage applications. Workstation

and file servers also handle large data file

read/write requests, making sequential

data performance a critical performance

RAID levels

Enclosures per port

Ports

Write policies

Read policies

Virtual disks per controller

Cache memory size

PCIe link width

256 KB, 512 KB, and

1,024 KB stripe sizes

SATA NCQ support

Global, dedicated, and

affinity hot spares

Online capacity expansion

Hot-swappable drives

Mixed-capacity physical

disk support

Hardware exclusive OR

(XOR) assistance

Figure 2.

Feature comparison of Dell PERC 5 and PERC 6 controllers

requirement in enterprise environments.

For these applications, storage subsys-

tem performance is typically measured

Over 4 GB/sec

by sequential throughput, in megabytes

LSI 1078

peak

ROC

throughput

per second.

SAS

3 Gbps

cally include transaction processing

core

SAS

applications such as databases, Web-

2.4 GB/sec

based e-commerce applications, and

Bottleneck

peak throughput

other multitasking business solutions. For

these applications, storage subsystem

performance is typically measured in

I/Os per second.

CPU

hardware features

The PERC 6 continues the Dell focus on

designing RAID solutions based on the

latest interface technologies, from PCI to

PCIe, from parallel to serial. Employing a

ROC integrated circuit (IC) featuring a

high-speed, 64-bit, error-correcting code

(ECC)–protected DDR2 SDRAM interface;

a hardware RAID assist engine for parity

perc 5

0, 1, 5, 10, and 50

Up to three

2 x 4 wide ports

Write-through and write-back

Normal, read-ahead, and adaptive

Up to 64

256 MB

Global and dedicated

hot spares only

Random read/write applications typi-

perc 6

0, 1, 5, 6, 10, 50, and 60

Up to three

2 x 4 wide ports

Write-through and write-back

Normal, read-ahead, and adaptive

Up to 64

256 MB (up to 512 MB

for PERC 6/E)

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