Im following the directions from

Mirroring the Root File System and Primary Swap

#

Mirror the root logical volume to the above disk:

lvextend -m 1 /dev/vg00/lvol1 /dev/dsk/c0t3d0

#

Mirror the primary swap logical volume:

lvextend -m 1 /dev/vg00/prswaplv /dev/dsk/c0t3d0

#

Verify that the boot information contained in the BDRA of the boot disks in the root volume group has been automatically updated by lvlnboot(1M) with the locations of the mirror copies of root and primary swap:

lvlnboot -v


but when i run the command i get this error

lvextend -m l /dev/vg00/lvol2 /dev/dsk/c2t1d0
Usage: lvextend
[-A Autobackup]
{-l LogicalExtentsNumber |
-L LogicalVolumeSize}
LogicalVolumePath [ PhysicalVolumePath... | PhysicalVolumeGroupName... ]
"m": Illegal option.


any ideas

For one thing, you need a "one" not a "lower case l". But if are getting "m illegal option", it sounds like you don't have MirrorDisk/UX installed. The lvextend man page says "The -m option is only meaningful if the optional HP MirrorDisk/UX software has been installed on the system."