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SAS technology allows for scaling significantly beyond Parallel SCSI, as indicated in Figure 1. Even though

U320 SCSI technology has a higher nominal throughput vs. SAS on a single drive basis, the shared bus

limitation imposes a bottleneck on system performance. The performance scalability of SAS when adding

hard disk drives to a system far exceeds the minimal bandwidth advantage of Parallel SCSI. SAS is therefore

the logical choice if scalability is a key requirement.

AIC and Fujitsu are among the first manufacturers to exploit these new capabilities to their fullest, starting

with the Fujitsu 3 rd generation 3Gb/sec SAS enterprise hard disk drive in a SFF 2.5" canister, model #

XC-28-SA1-2, which can host eight SFF hard disk drives in two standard 5.25" size bays. AIC also has 1U

10x and 2U 24x SFF bay server (Model # RSC-1A-SA1-2 and RSC-2A-SA1-2) while its Xtore business unit

offers the JBOD version (Model #XJ-SA26-110R and XJ-SA26-224R). With smaller form-factor hard disk

drives, a greater number of SAS hard disk drives can be installed in lieu of conventional 3.5" hard disk

drives, thus increasing total capacity and spindle density in the same physical area as well as improving I/O

performance. Everything becomes smaller! The smaller form factor also reduces power consumption and

heat dissipation.

Proven Performance

The current generation of Fujitsu 2.5" SFF SAS hard

disk drives have capacities of 36GB to 147GB,

offered at either 10K (MBB series) or 15K (MBC

series) RPM. They log a mean-time-between-failure

(MTBF) of 1,400,000 power-on hours. The hard disk

drives are hot pluggable, so they can be inserted or

removed without harming the data or the system

while the entire system is still powered on. The

vastly simplified SAS four-wire interconnect also

makes hot plugging easier. The 3Gb/sec SAS

interface of the Fujitsu hard disk drives allows

customers to take advantage of the increased

performance associated with Serial Attached SCSI,

while at the same time providing lower heat

dissipation, lower acoustics and lower power.

As a leader in storage technology globally, Fujitsu has been a leader in development of the SAS standard

and is a member of the SCSI Trade Association.

AIC has been focusing on storage enclosures for the past five years and was one of the first vendors to team

up with Fujitsu to develop 2.5" SFF SAS HD D enclosures. AIC's BR-SAS28 canister enables anyone wishing

to quickly transition to SAS to simply drop this canister into existing deployed servers that have at least two

open 5.25" bays. Self-contained cooling is completely server independent. For anyone with a bigger

appetite, AIC also offers 1U 10xSFF bays as well as 2U 24xSFF bay server enclosures. The JBOD lines with

identical configuration are offered through the Xtore business unit. RAID versions will also be available by

Q2 of 2006. AIC is also a member of SCSI Trade Association.

Advanced Industrial Computer, Inc.

Xtore Extreme Storage

Figure 1