Hitachi Lighting 9900 Series Architecture Manual page 79

Hitachi Data Systems
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WAN
Wide Area Networks or WANs are networks of computers that are geographically
dispersed and connected by radio waves, telephone lines, satellites, or high-speed fibre
optic backbones.
Warm site
An alternate-processing site that is only partially equipped (as compared to Hot site
which is fully equipped). See also Hot site and Cold site.
Workload
I/O workload refers to the pattern of I/Os presented to the Lightning 9900
system or to a disk drive.
XRC
Extended Remote Copy. IBM's implementation of a software asynchronous Remote
Copy technique that preserves data integrity. See also HXRC and Hitachi TrueCopy.
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