Originally posted by: ostost
You can do it through C-SPOC. Often diskspace in HA environments are mirrored. Therefore make sure you extend using hdisks from different storage subsystems/locations or even better configure Cross-Site LVM Mirroring.
smitty hacmp --> System Management (C-SPOC) --> Storage --> Logical Volumes
smitty hacmp --> System Management (C-SPOC) --> Storage --> File Systems