HP-UX System Administrator's Guide: Logical Volume Management (5900-3028, March 2013)

Max PXs per PV 16777216
Max Extent Size (Mbytes) 256
Min Unshare unit (Kbytes) 512
Max Unshare unit (Kbytes) 4096
Max Snapshots per LV 255
Determining LVM’s Maximum Limits on a System 153