What is Ultra3 SCSI and some of its advantages? - KB Article - 163022

What is Ultra3 SCSI and some of its advantages? - KB Article - 163022

The definition and advantages of Ultra3 SCSI.

Ultra3 SCSI is the next generation of SCSI development. Ultra3 SCSI allows for bandwidth of 160 Mbytes/sec. This is done by doubling the number of data signals sent per clock cycle compared to Ultra2 SCSI.

Why is that speed necessary?

As applications and data become larger, the demands on servers also increase. To be able to retrieve data and send it to users efficiently, requires faster hard drive access with lower CPU utilization. Just three Ultra2 SCSI drives can saturate an Ultra2 SCSI channel, leaving no bandwidth for other SCSI devices. With Ultra3 SCSI, there is enough bandwidth for future expansion without loss of performance.

Will I be able to use my older SCSI drives with an Ultra3 SCSI drive?

Ultra3 SCSI maintains full backwards compatibility with legacy SCSI devices. Since Ultra3 SCSI is a modified Ultra2 SCSI solution, it uses Ultra2 SCSI cables, insuring ease of installation.

What is the maximum cable length?

With the use of LVD (low voltage differential) technology, Ultra3 SCSI provides for cable lengths of up to 12 meters, allowing for multiple drive configurations and hassle-free external device setup. In a single-device channel, cable length can actually be 25 meters.


Quick Tips content is self-published by the Dell Support Professionals who resolve issues daily. In order to achieve a speedy publication, Quick Tips may represent only partial solutions or work-arounds that are still in development or pending further proof of successfully resolving an issue. As such Quick Tips have not been reviewed, validated or approved by Dell and should be used with appropriate caution. Dell shall not be liable for any loss, including but not limited to loss of data, loss of profit or loss of revenue, which customers may incur by following any procedure or advice set out in the Quick Tips.

Article ID: SLN99536

Last Date Modified: 11/14/2010 12:00 AM

Rate this article

Easy to understand
Was this article helpful?
Yes No
Send us feedback
Comments cannot contain these special characters: <>()\
Sorry, our feedback system is currently down. Please try again later.

Thank you for your feedback.