Product manual

77 A1 69UP Rev00 3-1
3. CDA 7 Input/Output Operations
This chapter describes input/output operations between the CDA 7 and a host
system.
• Integrated Cached Disk Array Operation
• Elements of a CDA 7 I/O Operation
3.1 ICDA Operation
Integrated Cached Disk Array operation is based on the principle that the currently
active data at any given time is relatively small when compared to the total
subsystem storage capacity. If this data is in cache, there is a significant
improvement in performance. The success of an Integrated Cached Disk Array
subsystem is based upon satisfaction of the following two characteristics:
Locality of Reference
If a given piece of information is used, there is a high probability that a nearby
piece of information will be used shortly thereafter.