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Access "Whys and Wherefores of SAS "

Published: 16 Oct 2012

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 controller chip, a single disk ... Access >>>

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Features
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      StorageTek's EchoView shows promise.

    • Whys and Wherefores of SAS

      Version 1.0 of the SAS spec was just completed by the SCSI Trade Association.

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      With long feature checklists, astonishing ROIs and seamless integration, storage management suites can seem like storage paradise. But look closely, and you may find that what you get isn't what you wanted to see.

    • Consolidation: The hard truth

      Every large enterprise can benefit from some kind of consolidation. But the benefits come at a price. Despite the hype, consolidation is a long process that can be complicated. Bottom line: You may have to wait to cash in on the benefits, but they will come.

    • Europe Better Equipped for Distributed SANs

      Europe is burning with SAN fever.

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      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.

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