24 Chapter 24. Extended address volume z/OS V1R10 introduced the extended address volume (EAV), which allowed DASD storage volumes to be larger than 65,520 cylinders. The space above the first 65,520 cylinders is referred to as cylinder-managed space. Tracks in cylinder-managed space use extended addressing space (EAS) techniques to access these tracks. Data sets that are able to use cylinder-managed space are referred to as being EAS-eligible. EAV support has been enhanced for both z/OS V1R11, z/OS V1R12, and z/OS V1R13. This chapter describes the following features, which are available with each of the releases. It also explains the changes that are specifically for z/OS V1R13: Basic EAV functionality Enhancements to EAV in z/OS V1R13 New functions in DFSMSdfp to better cope with the huge spaces opened up by EAV capabilities, including: ­ Catalog PARMLIB member ­ Alias number constraint relief ­ Catalog VVDS expansion Enhanced FTP support for EAVs © Copyright IBM Corp. 2012. All rights reserved. 539