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
$102.13
Apple Inc.
+1.24
MSFT
$44.87
Microsoft Corpora
-0.14
GOOG
$571.00
Google Inc.
-6.86

MacTech Search:
Community Search:

Software Updates via MacUpdate

Cocktail 7.6 - General maintenance and o...
Cocktail is a general purpose utility for OS X that lets you clean, repair and optimize your Mac. It is a powerful digital toolset that helps hundreds of thousands of Mac users around the world get... Read more
LaunchBar 6.1 - Powerful file/URL/email...
LaunchBar is an award-winning productivity utility that offers an amazingly intuitive and efficient way to search and access any kind of information stored on your computer or on the Web. It provides... Read more
Maya 2015 - Professional 3D modeling and...
Maya is an award-winning software and powerful, integrated 3D modeling, animation, visual effects, and rendering solution. Because Maya is based on an open architecture, all your work can be scripted... Read more
BBEdit 10.5.12 - Powerful text and HTML...
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
Microsoft Office 2011 14.4.4 - Popular p...
Microsoft Office 2011 helps you create professional documents and presentations. And since Office for Mac 2011 is compatible with Office for Windows, you can work on documents with virtually anyone... Read more
TextWrangler 4.5.10 - Free general purpo...
TextWrangler is the powerful general purpose text editor, and Unix and server administrator's tool. Oh, and also, like the best things in life, it's free. TextWrangler is the "little brother" to... Read more
BitTorrent Sync 1.4.72 - Sync files secu...
BitTorrent Sync allows you to sync unlimited files between your own devices, or share a folder with friends and family to automatically sync anything. File transfers are encrypted. Your information... Read more
Cyberduck 4.5.2 - FTP and SFTP browser....
Cyberduck is a robust FTP/FTP-TLS/SFTP browser for the Mac whose lack of visual clutter and cleverly intuitive features make it easy to use. Support for external editors and system technologies such... Read more
Tinderbox 6.0.3 - Store and organize you...
Tinderbox is a personal content management assistant. It stores your notes, ideas, and plans. It can help you organize and understand them. And Tinderbox helps you share ideas through Web journals... Read more
Adobe Photoshop CC 2014 15.1.0 - Profess...
Photoshop CC 2014 is available as part of Adobe Creative Cloud for as little as $19.99/month (or $9.99/month if you're a previous Photoshop customer). Photoshop CS6 is still available for purchase (... Read more

Latest Forum Discussions

See All

Invaders! From Outer Space Review
Invaders! From Outer Space Review By Rob Thomas on August 27th, 2014 Our Rating: :: RETRO NOSTALGIAUniversal App - Designed for iPhone and iPad It’s a shame that Invaders! doesn’t offer deeper gameplay, as this retro-inspired... | Read more »
Spooklands Review
Spooklands Review By Jennifer Allen on August 27th, 2014 Our Rating: :: ONE-TOUCH SHOOTERUniversal App - Designed for iPhone and iPad One-touch simultaneously controls your direction and your weapon in this unique arena shooter.   | Read more »
Heroes of Order & Chaos Add Twitch I...
Heroes of Order & Chaos Add Twitch Integration, New Heroes, and More Posted by Ellis Spice on August 27th, 2014 [ permalink ] | Read more »
Foodie Yama Review
Foodie Yama Review By Jennifer Allen on August 27th, 2014 Our Rating: :: BRIEFLY HOOKSUniversal App - Designed for iPhone and iPad Foodie Yama will draw you in for a brief while, and you’ll never be entirely sure why.   | Read more »
Spotify Connect Turns One, Now Supports...
Spotify Connect Turns One, Now Supports New Devices Posted by Ellis Spice on August 27th, 2014 [ permalink ] Universal App - Designed for iPhone and iPad | Read more »
The Rise of PicsaStock and How You Can M...
We all take plenty of photos, right? That’s the joy of having a reasonably powerful camera in your pocket, thanks to your trusty iPhone and a bevy of similarly useful apps. Wouldn’t it be great to make some money out of those snaps? While your... | Read more »
Appointment With F.E.A.R Review
Appointment With F.E.A.R Review By Jennifer Allen on August 27th, 2014 Our Rating: :: CAMP DELIGHTUniversal App - Designed for iPhone and iPad Ever wanted to be a superhero? Appointment With F.E.A.R is a fine way to live that dream... | Read more »
Ultra Drift Review
Ultra Drift Review By Rob Thomas on August 27th, 2014 Our Rating: :: ULTRA DULLUniversal App - Designed for iPhone and iPad Ultra Drift is fine in concept, but the execution runs head-first into the wall. And so will you. Over and... | Read more »
Star Walk 2 is Like Stargazing with Neil...
Star Walk 2 is Like Stargazing with Neil DeGrasse Tyson in Your Pocket Posted by Jessica Fisher on August 27th, 2014 [ permalink ] | Read more »
Watch the World Go By Really Fast with I...
Watch the World Go By Really Fast with Instagram’s New Hyperlapse Posted by Jessica Fisher on August 27th, 2014 [ permalink ] Universal App - Designed for iPhone and iPad | Read more »

Price Scanner via MacPrices.net

The iPad’s Real Competitive Challenger (Not S...
It’s been my contention for some time that the iPad is suffering from something of an identity crisis, and I suspect that may be a factor in slackening sales this year. Apple can’t seem to decide... Read more
13-inch 2.6GHz/256GB Retina MacBook Pro on sa...
B&H Photo has the 13″ 2.6GHz/256GB Retina MacBook Pro on sale for $1379 including free shipping plus NY sales tax only. Their price is $120 off MSRP. Read more
Life Inventory iOS Apps – Learn to Know Thyse...
James Hollender’s Life Inventory apps s are now on sale with 20% off thru Labor Day, 09/01/2014. This is a great opportunity to get started on that Moral Inventory you’ve been putting off doing for... Read more
Pocket Watch, LLC. Reveals Cloud Server For P...
Beaumont, Texas based Pocket Watch, LLC. has announced the availability of its new ActivePrint Cloud Server Powered by Raspberry Pi. With this small standalone box almost any USB printer or available... Read more
902it Simplifies Area Code Changes For Nova S...
The east coast Canadian provinces of Nova Scotia and Prince Edward Island are phasing in 10 digit telephone dialing, to be fully in place by November, in order to accommodate a second area code to... Read more
Boomerang iPad Stand Mounts Your iPad Anywher...
Boomerang, a Mountable Stand with Multiple Viewing Angles, is now available for iPad Air. Boomerang combines several functions that aim to expand your iPad’s potential in one, elegant product. The... Read more
Retina MacBook Pros available starting at $10...
The Apple Store has Apple Certified Refurbished 13″ and 15″ MacBook Pros available starting at $929. Apple’s one-year warranty is standard, and shipping is free: - 13″ 2.5GHz MacBook Pros (4GB RAM/... Read more
Apple 27-inch Thunderbolt Display (refurbishe...
The Apple Store has Apple Certified Refurbished 27″ Thunderbolt Displays available for $799 including free shipping. That’s $200 off the cost of new models. Read more
Apple offers free $25 iTunes gift card with p...
The Apple Store is offering a free $25 iTunes Gift Card with the purchase of a $99 Apple TV for a limited time. Shipping is free. Read more
Apple’s 2014 Back to School promotion: $100 g...
 Apple’s 2014 Back to School promotion includes a free $100 App Store Gift Card with the purchase of any new Mac (Mac mini excluded), or a $50 Gift Card with the purchase of an iPad or iPhone,... Read more

Jobs Board

*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
Senior Event Manager, *Apple* Retail Market...
…This senior level position is responsible for leading and imagining the Apple Retail Team's global event strategy. Delivering an overarching brand story; in-store, Read more
*Apple* Solutions Consultant (ASC) - Apple (...
**Job Summary** The ASC is an Apple employee who serves as an Apple brand ambassador and influencer in a Reseller's store. The ASC's role is to grow Apple Read more
Project Manager / Business Analyst, WW *Appl...
…a senior project manager / business analyst to work within our Worldwide Apple Fulfillment Operations and the Business Process Re-engineering team. This role will work Read more
Position Opening at *Apple* - Apple (United...
…customers purchase our products, you're the one who helps them get more out of their new Apple technology. Your day in the Apple Store is filled with a range of Read more
All contents are Copyright 1984-2011 by Xplain Corporation. All rights reserved. Theme designed by Icreon.