During backup processing, the server could not allocate sufficient mount points for the volumes required.
The indicated backup process ends.
If necessary, make more mount points available. To prevent sessions or processes from having to wait for a mount point, increase the value of the MOUNTLIMIT parameter in the device-class definition. Set the value of the MOUNTLIMIT parameter high enough to allow all server processes using deduplicated storage pools to open the number of volumes specified by the NUMOPENVOLSALLOWED option.