When a native root volume group (rootvg) is enabled for DMP, and contains multiple SAN disks, you can reduce the rootvg. Use this procedure to remove a SAN disk from a rootvg that includes multiple SAN disks. This procedure can be done online, without requiring a reboot.
To remove a SAN disk from a DMP-enabled rootvg
# lsvg -p rootvg PV_NAME PV STATE TOTAL PPs FREE PPs FREE DISTRIBUTION hdisk1 active 73 8 00..00..00..00..08 hdisk21 active 15 15 03..03..03..03..03
# lspv | grep -w rootvg hdisk1 00c398edf9fae077 rootvg active hdisk21 00c398ed00008e79 rootvg active hdisk22 00c398ed00008e79 rootvg active hdisk24 00c398edf9fae077 rootvg active
# vxdmpadm native acquire
# lspv | grep -w rootvg emc0_0039 00c398ed00008e79 rootvg active emc0_00a7 00c398edf9fae077 rootvg active
# reducevg rootvg emc0_00a7
# lsvg -p rootvg PV_NAME PV STATE TOTAL PPs FREE PPs FREE DISTRIBUTION emc0_0039 active 73 8 00..00..00..00..08
# lspv | grep -w rootvg emc0_0039 00c398ed00008e79 rootvg active
# vxdmpadm native release
# lspv | grep -w rootvg hdisk22 00c398ed00008e79 rootvg active hdisk21 00c398ed00008e79 rootvg active