Apple said today that it will miss the deadline for shipping its Xsan storage management software. Xsan, which will sell for US$999, was scheduled to be released before today. “Xsan will not ship this year; it will ship early next year,” Apple said in a statement. The company did not provide the reason for the delay. Xsan is “designed to further Apple’s position in the clustering market,” according to CNET “Xsan allows multiple computers to concurrently access terabytes worth of storage housed on Xserve RAID disks, Apple’s rack-mounted storage system.”