Tacit combines WAFS and WAN optimization

Posted on May 01, 2006

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By Ann Silverthorn

Tacit Networks has added WAN optimization to wide area file services (WAFS) with the 3.0 release of its Ishared software for enterprise branch and remote office locations. In addition to WAFS and WAN optimization, the Windows-based solution includes Exchange e-mail services and Windows-based branch-office IT services.

The new capabilities are available as either a software-based solution that runs on industry-standard servers or on Tacit’s Ishared appliance platforms.

“Until now, we allowed users to consolidate multiple servers, such as file, print, and authentication servers, onto the Ishared product,” says Noah Breslow, vice president of marketing and product management at Tacit. “The major new feature for 3.0 is WAN optimization. We took some of the technologies we already developed for WAFS and extended them to support all TCP-based apps. The optimizations for TCP accelerate Web traffic, FTP, or replication applications, and collaboration applications such as Microsoft SharePoint and Lotus Notes.”

Tacit joins other vendors combining WAFS and WAN optimization (sometimes referred to as WAN acceleration), including Cisco, Expand Networks, Juniper, Riverbed, McData (a Riverbed OEM), and Signiant. Expand Networks OEMs its WAFS product from DiskSites. Incidentally, Brocade invested heavily in Tacit last year to add Tacit’s WAFS product to the Brocade portfolio.

Tacit has dubbed its WAN optimization technology Acceleration, Reduction, and Compression (ARC). It reduces WAN latency and bandwidth consumption to accelerate TCP-based applications by providing local acknowledgements and WAN re-transmissions to reduce the impact of network latency and packet loss. For the data reduction piece, it eliminates redundant transfers over the WAN by analyzing traffic flow and transmitting references to repeated data patterns rather than the data itself. Tacit claims compression ratios of up to 100:1 and applies data aggregation techniques to compress data.

Breslow says that one of Tacit’s differentiators is its Windows compatibility: “We introduced the Windows product a year after our Linux product and now the Windows version comprises the vast majority of our sales. This compatibility is beneficial as protocols change and evolve, and it facilitates integration of end-to-end security and management schemes.”

Other features of Ishared 3.0 include remote-device fail-over and support for Microsoft Windows Server 2003 R2. If a device fails at a remote office, it can fail-over to a remote device. Also, a network of remote offices can be flipped over to a secondary data center. Breslow notes that Microsoft Server 2003 R2 has an improved replication engine and file and print management schemes.

Customers who currently have a standard maintenance agreement with Tacit will receive version 3.0 with their next software upgrade. An entry-level appliance for fewer than five users is priced from about $4,500. An appliance designed for larger branch offices is priced from approximately $7,500.


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