Pro+ Content/Storage magazine

Thank you for joining!
Access your Pro+ Content below.
Vol. 2 No. 4 June 2003

Whys and Wherefores of SAS

For more than 20 years, disk drives and systems have connected across a parallel bus interface, which is now giving way to a serial architecture--Serial ATA (SATA) drives are case in point. And then there are Serial-Attached SCSI (SAS) drives. Version 1.0 of the SAS spec was just completed by the SCSI Trade Association. SAS, due out in less than a year's time, should present a host of improvements over parallel SCSI, including: Thinner cables. Serial cables are only 5/16," compared to a 1 3/4" parallel SCSI ribbon, for better air flow. Better connectivity. SAS calls for up to 4,000 devices per port, and 128 drives per channel. Practically speaking, it will be possible to connect hundreds of SAS drives together. Improved performance. First generation SAS drives will have a 3Gb connection, about the same as Ultra320 drives. But because SAS drives are connected point-to-point, there's no bandwidth contention across a shared bus. Dual connectors. Data travels full-duplex at 3Gb/s. Compatibility with SATA drives. When behind a SAS ...

Access this Pro+ Content for Free!

By submitting you agree to recieve email from TechTarget and its partners. If you reside outside of the United States you consent to having your personal data transferred and processed in the United States. Privacy Policy

Features in this issue

  • Inverse multiplexing

    Inverse multiplexing

  • Copy basics

    by  David Braue

    Snapshot and replication are important tools in building a foolproof disaster recovery plan. This article helps you pick the optimal solution that fits within your budget and is best suited for your company's individual backup needs.

  • The case for network smarts

    Let's face it: SANs as they currently exist only deliver about half of what you might hope for in the way of efficiency and optimal utilization. The best bet to deliver the other 50% is network-based storage intelligence. You'll have to get past the magic-wand claims for this latest pancea from storage vendors, though. And not every incarnation of smart switches or appliances is going to be right for you.

Columns in this issue

SearchSolidStateStorage

SearchVirtualStorage

SearchCloudStorage

SearchDisasterRecovery

SearchDataBackup

-ADS BY GOOGLE

Close