TweetFollow Us on Twitter

ATTO ExpressPCI UL4S and ExpressPCI UL4D SCSI Adapters

Volume Number: 22 (2006)
Issue Number: 04
Column Tag: Review

ATTO ExpressPCI UL4S and ExpressPCI UL4D SCSI Adapters

Subhead

by MacTech Staff

SCSI on Mac OS X

For those of you who have been around to remember SCSI on early Mac OS X, you'll likely recall that SCSI on Mac OS X 10.0 and 10.1, and even to some extent 10.2, was a nightmare: troublesome, error prone, and unreliable. Ultimately, Apple re-wrote the SCSI implementation, and SCSI on Panther and beyond has worked as it should. It would be a mistake to judge SCSI today by those early experiences.

Today's SCSI Experience

When it comes to SCSI on the Mac, the first name that comes to mind is ATTO. ATTO has a variety of technologies, SCSI and others, and a variety of form factors. In our case, we looked at the single connector ExpressPCI UL4S, and the dual connector ExpressPCI UL4D SCSI adapters.

Simply put, these products provided a very pleasurable experience -- we installed the cards, and they worked. No drivers. No hassles. It just worked, and it worked well.

To be fair, many people may prefer FibreChannel. It all comes down to what you want to connect to, what is available to you, and what you want the future path to be. If you do choose FibreChannel, you should also take a look at what ATTO has to offer as they are strong there as well.

The Details of SCSI

ATTO ExpressPCI UL4S and ExpressPCI UL4D SCSI adapters are part of the Ultra320 SCSI host adapter series for data intensive enterprise servers and high-end workstations running applications such as high-end video editing, database engines, messaging, and web servers. UL4S and UL4D support up to 30 SCSI bus IDs and Low Voltage Differential (LVD) for cabling up to 12.5 meters per bus. Both products are compatible with single-ended SCSI devices, providing cable distances up to 3 meters. UL4S is a single channel Ultra320SCSI, PCI-X host adapter with data transfer rate of 320 MB/sec, whereas UL4D is a dual channel Ultra320SCSI, PCI-X host adapter with data transfer rate of up to 640 MB/sec. UL4S and UL4D are compatible with Mac OS X, Windows Server 2003, Windows XP, Windows 2000, and Linux. Dynamic bus rescan is available for Mac OS X only.

While 3 meters of cable is recommended for most applications, when we did our install, the drive was in the rack, and the PowerMac wasn't. We reached out to see what cables were available in longer lengths. We found the folks at 9 To 5 Computer Supply <www.9to5computer.com> had a 10m (yes, 30 feet) cable, and they sent it over for us to take a look at. 9to5 also has a range of other "toys", new and refurbished, with a focus on mass storage solutions.

We plugged the long cable in, and the throughput was spectacular between the ATTO card and the Quantum SDLT II. Be careful when you order cables as there's a variety of connectors for the SCSI 3. In our case, we needed a VHDCI male to HD68.

UL4D is equipped with two external VHDCI, and two internal high-density 68-pin connectors. It is 6.521 inches in length and 4.450 inches in height. UL4S features one external high-density 68-pin connector, and one internal high-density 68-pin connector. It is 6.521 inches in length and 4.2 inches in height. UL4D is Mac G5 compatible, and it is available as a standalone or part of an ExpressRAID Kit that includes ExpressRAID Software.


ExpressPCI UL4D


ExpressPCI UL4S

The UL4S and UL4D both feature a 64-bit/133 MHz PCI-X bus with compatibility to PCI-X 1.0a and PCI 2.2. Accelerated PCI bus management enables PCI Bus Master rate of 1-GB/sec. UL4S and UL4D can operate in temperature range of 0-45 degrees C, humidity 10-90% non-condensing, and airflow 100 LFM (min). Power rating of both SCSI adapters is 0.75 typical/2.0 max. Amps @ + 5.0 /VDC, and 0.05 Amps @ + 12.0 VDC with PCI signal compatibility of 3.3 Volts/5 Volts. In terms of reliability of these products, MTBF (mean time between failures) is 150,000 hours, and MTTR (mean time to repair) is less than 15 minutes.

Backward Compatibility and Advanced Streaming

While we were focused on SCSI-3 and newer technologies, there are times you want to be able to use older items. ATTO's proprietary Vpath Technology enables the UL4S, and UL4D to offer users the flexibility of connecting high-speed Ultra320 devices externally, and slower legacy devices internally, or vice versa, without compromising on the performance of the high-speed device. Backward compatibility is supported for Ultra 160, Ultra2, Ultra/WIDE, Fast/WIDE and Narrow SCSI devices. The UL4S and UL4D are ASPI (Windows) compatible, RAID ready, PC 99 compliant, plug and play compatible, feature Flash ROM for easy field upgrades, and supports automatic and upper-byte termination for narrow devices.

The Advance Data Streaming (ADS) feature provides controlled acceleration of data transfers utilizing optimized SCSI-3 algorithms, embedded RISC I/O processors for low overhead, and optimized gather/scatter of lists. ADS, facilitates bus mastering eliminating CPU processing time as bottleneck. Tagged command queuing in ADS allows efficient processing of threads, and disconnect/reconnect reduces wait time between transfers.

The UL4S and UL4D also support Ultra320 specific features such as packetized SCSI, read/write data streaming, training patterns, pre-compensation, double transition clocking, Quick Arbitration Select (QAS), Cyclical Redundancy Checking (CRC), Domain Validation (DV), Asynchronous Information Protection (AIP), free-running clock, and flow control. They also support multiple block sizes, and are bootable from attached disks.

UL4S and UL4D come with ATTO ExpressPro-Tools and ATTO Configuration Tool formatting, and utility software. UL4S and UL4D are priced at $349 and $499 respectively. Both products are RoHS compliant (2002/95/EC).

Avalable at http://www.attostore.com


MacTech Staff

 
AAPL
$112.94
Apple Inc.
+1.16
MSFT
$47.98
Microsoft Corpora
+0.32
GOOG
$524.87
Google Inc.
+8.52

MacTech Search:
Community Search:

Software Updates via MacUpdate

NeoOffice 2014.6 - Mac-tailored, OpenOff...
NeoOffice is a complete office suite for OS X. With NeoOffice, users can view, edit, and save OpenOffice documents, PDF files, and most Microsoft Word, Excel, and PowerPoint documents. NeoOffice 3.x... Read more
LibreOffice 4.3.5.2 - Free Open Source o...
LibreOffice is an office suite (word processor, spreadsheet, presentations, drawing tool) compatible with other major office suites. The Document Foundation is coordinating development and... Read more
CleanApp 5.0.0 Beta 5 - Application dein...
CleanApp is an application deinstaller and archiver.... Your hard drive gets fuller day by day, but do you know why? CleanApp 5 provides you with insights how to reclaim disk space. There are... Read more
Monolingual 1.6.2 - Remove unwanted OS X...
Monolingual is a program for removing unnecesary language resources from OS X, in order to reclaim several hundred megabytes of disk space. It requires a 64-bit capable Intel-based Mac and at least... Read more
NetShade 6.1 - Browse privately using an...
NetShade is an Internet security tool that conceals your IP address on the web. NetShade routes your Web connection through either a public anonymous proxy server, or one of NetShade's own dedicated... Read more
calibre 2.13 - Complete e-library manage...
Calibre is a complete e-book library manager. Organize your collection, convert your books to multiple formats, and sync with all of your devices. Let Calibre be your multi-tasking digital librarian... Read more
Mellel 3.3.7 - Powerful word processor w...
Mellel is the leading word processor for OS X and has been widely considered the industry standard since its inception. Mellel focuses on writers and scholars for technical writing and multilingual... Read more
ScreenFlow 5.0.1 - Create screen recordi...
Save 10% with the exclusive MacUpdate coupon code: AFMacUpdate10 Buy now! ScreenFlow is powerful, easy-to-use screencasting software for the Mac. With ScreenFlow you can record the contents of your... Read more
Simon 4.0 - Monitor changes and crashes...
Simon monitors websites and alerts you of crashes and changes. Select pages to monitor, choose your alert options, and customize your settings. Simon does the rest. Keep a watchful eye on your... Read more
BBEdit 11.0.2 - Powerful text and HTML e...
BBEdit is the leading professional HTML and text editor for the Mac. Specifically crafted in response to the needs of Web authors and software developers, this award-winning product provides a... Read more

Latest Forum Discussions

See All

This Week at 148Apps: December 15-19, 20...
Happy Holidays from 148Apps!   How do you know what apps are worth your time and money? Just look to the review team at 148Apps. We sort through the chaos and find the apps you’re looking for. The ones we love become Editor’s Choice, standing out... | Read more »
New Version of Tempo Smart Calendar Help...
New Version of Tempo Smart Calendar Helps You Plan Your Day Without Opening the App Posted by Jessica Fisher on December 22nd, 2014 [ permalink ] | Read more »
Sparkle - Advanced Cross-Synthesis (Mus...
Sparkle - Advanced Cross-Synthesis 1.0 Device: iOS Universal Category: Music Price: $6.99, Version: 1.0 (iTunes) Description: Sparkle is a tool for advanced spectral hybridizations made of several algorithms that operate on frequency... | Read more »
DICETINY is coming to iOS in 2015
DICETINY is coming to iOS in 2015 Posted by Jessica Fisher on December 22nd, 2014 [ permalink ] Fakedice has announced that they’re bringing their digital board game DICETINY to iOS. | Read more »
It Came From Canada: The Witcher Battle...
The Witcher 3: Wild Hunt may still be a few months away, but very soon players will be able to get a new taste of the acclaimed Polish RPG on their mobile devices with The Witcher Battle Arena. While it trades open-world exploration for compact... | Read more »
The Babies Get Lost Again in the New Azt...
The Babies Get Lost Again in the New Aztec Ruins Update for Light in the Dark Posted by Jessica Fisher on December 22nd, 2014 [ permalink ] | Read more »
Living Room 3D for IKEA Makes All In-App...
Living Room 3D for IKEA Makes All In-App Purchases Free Until 2015 Posted by Jessica Fisher on December 22nd, 2014 [ permalink ] | Read more »
Crossbow Warrior – The Legend of William...
Crossbow Warrior – The Legend of William Tell Review By Lee Hamlet on December 22nd, 2014 Our Rating: :: MISSES THE MARKUniversal App - Designed for iPhone and iPad Crossbow Warrior details the entertaining adventures of legendary... | Read more »
A New Update Races onto Asphalt 8: Airbo...
A New Update Races onto Asphalt 8: Airborne Posted by Jessica Fisher on December 22nd, 2014 [ permalink ] Universal App - Designed for iPhone and iPad | Read more »
Workflow: Powerful Automation Made Simpl...
Workflow: Powerful Automation Made Simple Review By Campbell Bird on December 22nd, 2014 Our Rating: :: GO WITH THE FLOWUniversal App - Designed for iPhone and iPad This powerful app lets users accomplish multiple tasks at touch of... | Read more »

Price Scanner via MacPrices.net

13-inch 2.4GHz Retina MacBook Pro (Apple refu...
The Apple Store has previous-generation Apple Certified Refurbished 13″ 2.4GHz/128GB Retina MacBook Pros available for $999. Apple’s one-year warranty is standard, and shipping is free: - 13″ 2.4GHz/... Read more
Apple resellers offer free overnight shipping
The Apple Store is now offering free next-day shipping on all in stock items if ordered before 12/23/14 at 10:00am PT. Local store pickup is also available within an hour of ordering for any in stock... Read more
Holiday sales continue: MacBook Airs for up t...
 B&H Photo has 2014 MacBook Airs on sale for up to $120 off MSRP, for a limited time, for the Thanksgiving/Christmas Holiday shopping season. Shipping is free, and B&H charges NY sales tax... Read more
Holiday sale continues: 13-inch Retina MacBoo...
 B&H Photo has new 13″ MacBook Pros on sale for up to $150 off MSRP as part of their Holiday pricing. Shipping is free, and B&H charges NY sales tax only: - 13″ 2.5GHz MacBook Pro: $979 save... Read more
Holiday sale continues: 15-inch Retina MacBoo...
 B&H Photo has the new 2014 15″ Retina MacBook Pros on sale for up to $300 off MSRP for a limited time. Shipping is free, and B&H charges NY sales tax only: - 15″ 2.2GHz Retina MacBook Pro: $... Read more
Holiday sale: 13-inch 128GB MacBook Air for $...
 Best Buy has the 2014 13-inch 1.4GHz 128GB MacBook Air on sale for $849.99, or $150 off MSRP, on their online store. Choose free home shipping or free local store pickup (if available). Price valid... Read more
13-inch 2.6GHz Retina MacBook Pro on sale for...
Best Buy has lowered their price on the 2014 13″ 2.6GHz/128GB Retina MacBook Pro to $1149.99 on their online store for a limited time. That’s $150 off MSRP and the lowest price available for this... Read more
Kodak Returns to CES With New Consumer Produ...
Former photography colossus Kodak is returning to CES for the first time in three years where the Kodak booth (#21818 South Hall 1) will showcase a wide range of innovative, imaging-related products... Read more
Invaluable Launches New Eponymously -Named A...
Invaluable, the world’s largest online live auction marketplace, hhas announced the official launch of the Invaluable app for iPad, now available for download in the iTunes App Store. Invaluable... Read more
IDC Reveals Worldwide Mobile Enterprise Appli...
International Data Corporation (IDC) last week hosted the IDC FutureScape: Worldwide Mobile Enterprise Applications and Solutions 2015 Predictions Web conference. The session provided organizations... Read more

Jobs Board

*Apple* Store Leader Program (US) - Apple, I...
…Summary Learn and grow as you explore the art of leadership at the Apple Store. You'll master our retail business inside and out through training, hands-on experience, Read more
Project Manager, *Apple* Financial Services...
**Job Summary** Apple Financial Services (AFS) offers consumers, businesses and educational institutions ways to finance Apple purchases. We work with national and Read more
*Apple* Retail - Multiple Positions (US) - A...
Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, you're also the Read more
*Apple* Retail - Multiple Positions (US) - A...
Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, you're also the Read more
*Apple* Retail - Multiple Positions (US) - A...
Job Description: Sales Specialist - Retail Customer Service and Sales Transform Apple Store visitors into loyal Apple customers. When customers enter the store, Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.