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Vol. 7 No. 2 April 2008

Ask the Expert: RAID performance issues

Q: How does the performance of SATA in RAID compare to SCSI in RAID? A: Over the past several years there have been many improvements to SATA and RAID, including RAID on a chip (ROC) embedded on server motherboards, as well as adapters. Some of the improvements beyond performance, lower cost and reduced power consumption include acceleration of RAID 6, more cache memory, and support for SAS and SATA intermix. Generally speaking, the SAS disk drives will perform better than the SATA disk drives. Keep in mind that from a performance standpoint you may be comparing apples to oranges with SATA vs. parallel SCSI, as well as different adapters. Also, some ROCs or adapters are tuned for high-throughput reads or writes, while others may be tuned for lots of small I/O operations. For performance numbers, check out the Web sites of AMD, Applied Micro Circuits, Atto Technology, Intel and LSI, among others. --Greg Schulz, founder and senior analyst, StorageIO Group

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Features in this issue

  • Is iSCSI good enough?

    by  Deni Connor

    Organizations of all sizes have adopted iSCSI because it's easy to install, inexpensive, behaves just like Ethernet and doesn't require specialized skill sets like Fibre Channel does. But do analyst claims that iSCSI performance falls short of that for Fiber Channel hold up?

  • Survey: Fibre Channel rules planned purchases

  • Automate application recovery

    by  Eric Burgener

    Today's application continuity computing (ACC) products are best suited for small- and medium-sized businesses, and are focused exclusively on Exchange, which most companies now consider a business-critical application. But the concentration on Exchange will likely change over the next few years, as several ACC vendors plan support for SQL Server and SharePoint in the future.

Columns in this issue

  • Best Practices: High hopes for thin provisioning

    Thin provisioning is a promising way to address allocation and performance. One of the biggest challenges when using the technology is knowing where your data lives, and whether it can be tracked or recovered if there's a catastrophic component failure.

  • Storage Bin 2.0: Winds of change push storage into a new era

    The transactional computing era is over. The Internet computing era is dragging data into the "cloud," and this new era will rain more files--and bigger files--down on you than you can ever imagine.

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