Unfortunately this variable must be set per volume, it cannot be 'unlimited' and it cannot be downsized.
According to the man page:
DESCRIPTION
maxfiles increases the number of files that a volume can
hold, as close as possible to max. File inodes are stored
in blocks, and the filer may round the requested max num-
ber of files to the nearest block.
Once increased, the value of max can never be lowered, so
the new value must be larger than the current value.
Further increasing this value to be an unlimited-like variable consumes filer RAM and will result in less usable filer RAM after a Data ONTAP OS upgrade.
Moral of the story - also monitor inode usage as well as disk usage on Netapp volumes!
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