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Vol. 3 No. 2 April 2004

DWDM a Boon for the Few

Is dense wavelength division multiplexing (DWDM) a success or a failure as a transport for synchronous data replication applications? It depends on who you talk to. According to Todd Bundy, director of business development and alliances for ADVA Optical Networks, at least in the metro, DWDM is popular among customers that used to rely on ESCON channel extension to run data mirroring applications such as IBM's Geographically Dispersed Parallel Sysplex (GDPS). GDPS mirrors and load balances zSeries data across remote locations. But Jim Morin, vice president of strategic planning at CNT, says DWDM has failed to take off the way he thought it might. "Three years ago, I was much more bullish on optical because it offers so much more bandwidth," he says. "With an optical DWDM solution, you can get 2Gb/s bandwidth with a single wavelength," he explains. With SONET, the same bandwidth requires an OC-48, which "costs an arm and a leg." CNT, which resells ADVA DWDM equipment, says it sees about 50% of its sales going into Metropolitan ...

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Features in this issue

  • IP storage delivers

    by  Johanna Ambrosio

    Despite all the FUD surrounding IP SANs, early users say IP-based storage isn't all that difficult to manage and that performance is sufficient. The key is knowing what applications IP SANs should be used for.

  • Disaster recovery relief

    The cost of disaster recovery tools can be even more than the value of the data that these very tools are supposed to be protecting. Fortunately, newer approaches to DR are restoring sanity to this high-pressure task.

  • Wrestling with regulations

    by  Bill O'Brien

    In the health care industry, complicated regulations such as HIPAA, combined with new technologies that require enormous amounts of storage, are driving storage managers to the emergency room.

  • Extreme backup

    by  Arun Taneja

    Newsflash: Conventional data protection has reached its limits and will be dramatically changing in the next couple of years. But all roads don't lead to the same result. Here's how to analyze which route is best for you.

  • Get control of capacity

    Although storage resource management tools can be complicated to implement, they're a better alternative to breaking the bank and rushing out to purchase more storage. Get precise with your vendors on what you need and you'll wind up with better results.

Columns in this issue

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