AIX 最大PP 每VG？

AIX 6.1 扩展VG时报错
0516-1714 /usr/sbin/extendvg: The total number of partitions on the disks for this

    volume group would be 71982, which exceeds the current maxpps
    value of 65536.  Increase the maxpps value to 131072 using
    the chvg -P command, then retry.

0516-792 /usr/sbin/extendvg: Unable to extend volume group.

lsvg vnx5500vg
VOLUME GROUP: vnx5500vg VG IDENTIFIER: 00f66f1d00004c000000015fe361572b
VG STATE: active PP SIZE: 128 megabyte(s)
VG PERMISSION: read/write TOTAL PPs: 47988 (6142464 megabytes)
MAX LVs: 256 FREE PPs: 11 (1408 megabytes)
LVs: 2 USED PPs: 47977 (6141056 megabytes)
OPEN LVs: 2 QUORUM: 7 (Enabled)
TOTAL PVs: 12 VG DESCRIPTORS: 12
STALE PVs: 0 STALE PPs: 0
ACTIVE PVs: 12 AUTO ON: yes
MAX PPs per VG: 65536 MAX PVs: 1024
LTG size (Dynamic): 1024 kilobyte(s) AUTO SYNC: no
HOT SPARE: no BB POLICY: relocatable
PV RESTRICTION: none

问：如何修改MAX PPs per VG?