This parameter indicates that OAM needs to start another optical drive to manage additional write requests for a specific Object or Object Backup storage group. When the number of requests to write objects to this Object or Object Backup storage group divided by the number of drives processing write requests for this storage group exceeds this threshold, OAM starts using an additional optical disk drive for writing to this storage group if one is available.
While your planning is typically oriented toward the OSMC storage management cycle, other OSMC functions (for example, Volume Recovery, Move Volume utility, and others) cause objects to be written into specific Object or Object Backup storage groups as well. If you plan to use these other types of OSMC functions, you need to consider and account for the drives these other types of OSMC functions require in addition to the drives required by the OSMC storage management cycle when determining the appropriate value for the threshold.