If you have not assigned a FlexShare priority to a volume, then that volume is given the default priority for your storage system. The default value for the default priority is Medium. You can change the value of the default priority.
The default priority is also used for all aggregate operations. Changing the default priority to be very high or very low may have unintended consequences.
option is either level or system, and the possible values for these options are the same as for assigning priorities for a specific volume.
The following command sets the default priority level for volumes to Medium, while setting the default system operations priority to Low.