Apple has released an update to its Xsan software, to version 2.1. The update is
available for download from Apple's Web site, and is recommended for all Xsan 2 users.
Xsan is Apple's specially developed storage area network (SAN) file system for Mac OS X. It's aimed at computing environments that need a 64-bit cluster file system running over FibreChannel. Applications include video postproduction, for example, or storage consolidation for large networks, broadcast video, iCal server clustering and more.
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Source: Infoworld