Veritas Volume Manager 4.1 Administrator's Guide (HP-UX 11i v3, February 2007)

Chapter 4, Creating and Administering Disk Groups
Moving Disk Groups Between Systems
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limit on the number of DMP and volume devices that can be configured on such a system
are 65,536 and 1,048,576 respectively. However, in practice, the number of VxVM devices
that can be configured in a single disk group is limited by the size of the private region.
When a CDS-compatible disk group is imported on a Linux system with a pre-2.6 kernel,
VxVM attempts to reassign the minor numbers of the volumes, and fails if this is not
possible.
To help ensure that a CDS-compatible disk group is portable between operating systems,
including Linux with a pre-2.6 kernel, use the following command to set the maxdev
attribute on the disk group:
# vxdg -g diskgroup set maxdev=4079
Note Such a disk group may still not be importable by VxVM 4.0 on Linux with a pre-2.6
kernel if it would increase the number of minor numbers on the system that are
assigned to volumes to more than 4079, or if the number of available extended
major numbers is smaller than 15.
You can use the following command to discover the maximum number of volumes that
are supported by VxVM on a Linux host:
# cat /proc/sys/vxvm/vxio/vol_max_volumes
4079
See the vxdg(1M) manual page for more information.