After users start reporting the Inability to create new flies in a CIFS share, you...

 The wafl.dir.size.max event occurs when a directory has reached its maximum directory size (maxdirsize) limit, which prevents new file creation in that directory. The maxdirsize is a volume-level option that can be modified using the volume modify command. To solve this issue, you should increase the maximum directory size for the volume that contains the CIFS share, as long as it does not exceed 3% of the physical memory. Alternatively, you can reorganize the directory structure to avoid having too many files in one directory. References =

Max Directory size error - NetApp Knowledge Base

How to identify the target directory of wafl.dir.size.warning - NetApp Knowledge Base

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WAFL Max dirsize | uadmin