By default in AIX, when one creates a Logical Volume it will use the default type, if unspecified. This is typically jfs. There are some cases whereby one will want to use RAW LVs. This is especially useful in the case of DB volumes.
To create a Raw LV, see the example below:
mklv -y db001.v01a -t raw dbvg01 640
-y = Specify the name of the Logical Volume
-t = Type of LV (only a label until it is formatted)
640 = The number of PPs to use for this LV
In the example above, to determine the size of this LV, simple do a lsvg dbvg01 |grep "PP SIZE" and multiple 640 x <PP SIZE> to determine the LV size.
If the volume is to be used by an application / DB, then you will “most likely” need to change the ownership of the raw device as well.
example:
chown oracle:dba /dev/rdb001.v01a
The LV will remain as Closed/synced until the LV is actually utilized.