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Storage

By Bhanu Prakash Dixit

Joe H. Trickey III

tial for organizations seeking to simplify their IT

environments while increasing controller and stor-

age reliability and server uptime. The Dell PowerEdge

Expandable RAID Controller (PERC) line of storage

controllers has evolved to address these data stor-

age requirements, providing innovative features to

Related Categories:

help support complex server-based storage environ-

ments, increase server uptime, and reduce adminis-

Dell PowerEdge RAID

Controller (PERC)

trative burdens.

PERC 6

RAID controllers supports SAS devices and Dell-

RAID

qualified Serial ATA (SATA) devices. It consists of

Serial Attached SCSI (SAS)

three PCI Express (PCIe)–based, 3 Gbps SAS RAID

Storage

controllers: the PERC 6/E adapter (which fits in a

Visit

DELL.COM/PowerSolutions

standard x8 PCIe slot supporting Dell PowerVault

for the complete category index.

direct attach storage), the PERC 6/i adapter

(which fits in a standard x8 PCIe slot supporting

internal storage for Dell PowerEdge servers and

Dell Precision

grated card (which supports internal storage for

Dell PowerEdge servers).

data rate 2 (DDR2) cache memory, with the

PERC 6/E supporting upgrades to 512 MB to allow

DELL POWER SOLUTIONS | May 2008

IntroducIng the

dell Perc 6 FamIly

oF SaS raId

controllerS

The Dell

Sanjay Tiwari

(PERC) 6 family of enterprise-class Serial Attached

Kedar Vaze

SCSI (SAS) RAID controllers is designed for enhanced

performance, increased reliability and fault tolerance,

and simplified management—providing a powerful,

easy-to-manage way to create a robust infrastructure

and help maximize server uptime.

s enterprise data requirements continue

to increase, deploying powerful, easy-to-

manage RAID solutions can become essen-

The PERC 6 family of Serial Attached SCSI (SAS)

workstations), and the PERC 6/i inte-

™

Each PERC 6 controller offers a 256 MB double

PowerEdge

Expandable RAID Controller

™

quick access to additional data and help increase

performance. PERC 6 controllers also include a bat-

tery backup unit to help maintain data consistency

and protect data in the controller cache during a

system power and/or controller failure. PERC 6 con-

trollers support RAID levels 0, 1, 5, 6, 10, 50, and 60.

The evolution of the PERC 6 from the PERC 5

reflects the Dell focus on simplifying IT, advancing

green technology, and designing total data solutions.

PERC 6 controllers take advantage of the PCIe archi-

tecture and include an enhanced controller chip

design to help substantially increase throughput and

remove the controller as a performance bottleneck

(see Figure 1). The optimization of the RAID design,

which incorporates the I/O processor and I/O control-

ler on a single RAID-on-a-chip (ROC) solution, enables

a significant reduction in power consumption for

PERC 6 controllers compared with equivalent

™

PERC 5 controllers. In addition, using a true PCIe solu-

tion by removing the PCI Extended (PCI-X) bridge

helps significantly increase performance under

sequential workloads. Figure 2 provides a compre-

hensive comparison of PERC 5 and PERC 6 features

and specifications.

PERC 6 controllers are designed to provide

enhanced performance, simplified management,

increased reliability and fault tolerance, optimized