OnTap 9 file system limitations

The number of subfolders under a folder , Limited by availability inode Number , as well as maxdirsize.

The following are some messages that might be reported when one of the limits has been reached:

Size limitation/ filesystem full:
no space left on the device

Inodes:
file system is out of inodes

Directory size:
Mon Jan  1 18:25:46 CEST [wafl.dir.size.max:warning]: Directory XX reached the maxdirsize limit. Reduce the number of files or use the vol options command to increase this limit.

The message on the client is similar to the following:
There is not enough space on the disk.

Reference material

What are the ONTAP limitations on files, directories, and subdirectories? - NetApp Knowledge Base