• Set PCTL_EXT_FSNAME to the name of the file system to be extended.
• If your request is to allocate space on a new volume, set the PCTL_EXT_NEW_VOL flag on.
• Set PCTL_EXT_UNIT to one of the following units to extend:
  1. ExtendFS_UNIT_MB to indicate that the amount to extend is in megabytes (MB).
  2. ExtendFS_UNIT_TRK to indicate that the amount to extend is in tracks.
  3. ExtendFS_UNIT_CYL to indicate that the amount to extend is in cylinders.
• Set PCTL_EXT_AMT to the amount to be extended.
• The caller must be a superuser.
• If the flag PCTL_EXT_NEW_VOL = off, an attempt to obtain additional space is only made on the last volume of the HFS. The HFS will not be extended to a new volume.
• If the flag PCTL_EXT_NEW_VOL = on, an attempt to obtain additional space is only made on a new volume. In this case, candidate volumes must exist for the HFS, and the candidate volumes must have existed at the time of the current mount of the HFS.
• If a secondary space amount exists for the HFS, it is ignored.
• If the entire amount requested cannot be obtained, the operation fails.

   confighfs -x size pathname         To extend on the same volume

   confighfs -xn size pathname        To extend to a new volume

where size is the amount to be extended suffixed by the extend unit of M (megabytes), T (tracks), or C (cylinders) and pathname is an absolute or relative pathname that identifies the HFS.