1,A disk drive must be dedicated exclusively to LVM. Using any section other than section 0 is not supported.
2,A disk drive can be a member of only one volume group.
3,The maximum number of logical volumes in a volume group is 255.(Range is 1-255; default is 255; set using vgcreate -l)
4,The maximum number of physical extents allowed per physical volume is 65535.(Range is 1-65535; default is 1016; set using vgcreate -e)
5,Maximum number of physical volumes per volume group is 255.(Range is 1-255; Default is 16; set using vgcreate -p)
Maximum number of volume groups is set in the kernel by the maxvgs parameter to default of 10. In order to change this, a new kernel must be generated with the desired value and can be increased to as high as 256 if necessary.
6,More than half of the configured LVM disks in a volume group must be present to change or activate that volume group. Quorum is checked both during configuration changes(for example, when creating a logical volume)and at state change(for example, if a disk fails). If quorum is not maintained, LVM will not acknowledge the change. To override quorum check use vgchange with the -q n option. If quorum is not met on the root volume group, the system will not boot.
Use "ISL> hpux -lq" to boot the system when quorum isn't present
7,Any time a change is made to the root volume group(i.e,root, swap, dump, or file system)the Boot Data Reserved Area(BDRA) must be updated using the lvlvboot command.
Failure to do this may result in an unbootable system.
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