Version 1.5 aggregates

For a version 1.5 aggregate, the architected maximum size for compatibility mode aggregates is approximately 16 TB (4 KB x 4 GB). If you use 3390 DASD that has 262,668 cylinders per volume, you can create a compatibility mode aggregate of about 11,425,931,919,360 bytes.

262668 cylinders per volume
x 90 blocks per cylinder
x 8KB per block
x 59 volumes
--------------------------
10641 GB or 10.39 TB

Version 1.5 aggregates have a larger architected maximum size than version 1.4 aggregates (approximately 16 TB versus approximately 4 TB). Also, extended (v5) directories can support more subdirectories than v4 directories (4G-1 versus 64K-1).