Extended address volumes
z/OS V1R10 introduced extended address volume (EAV), which allowed direct access storage devices (DASD) storage volumes to be larger than 65,520 cylinders. The increased volume capacity relieves a major system constraint, which is the maximum number of units you can define to a system at any single time.
This chapter introduces you to EAV, and brief you about its architecture, usage, and restrictions. It includes the following ...

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