Exadata Celldisk Allocation

Have an Exadata x6-2 quarter rack with 288T RAW storage with normal redundancy and ~228TB allocated.

Is there a recommended/require % of free space that should be left on the celldisks?

Output from one of the three cell servers:

CellCLI> list celldisk attributes name,size,freespace,freespacemap

         CD_00_exr1celadmin01    7.1192474365234375T     1.082977294921875T      ((offset=12.03125G,size=7.96875G),(offset=20.015625G,size=94.03125G),(offset=1.258834838867                            1875T,size=102G),(offset=1.7900848388671875T,size=102G),(offset=5.6504364013671875T,size=102G),(offset=6.4347076416015625T,size=700.96875G))

         CD_01_exr1celadmin01    7.1192474365234375T     1.082977294921875T      ((offset=12.03125G,size=7.96875G),(offset=20.015625G,size=94.03125G),(offset=1.258834838867                            1875T,size=102G),(offset=1.7900848388671875T,size=102G),(offset=5.6504364013671875T,size=102G),(offset=6.4347076416015625T,size=700.96875G))