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NetApp Knowledge Base

What is the NFSv3 mount "noac" option?

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Category:
ontap-9
Specialty:
nfs
Last Updated:

Applies to

ONTAP 9

Answer

The noac option is a client side option available that disables attribute caching.  This option is disabled by default.  Unless there's a very specific reason to enable the noac option, NetApp Technical Support does not recommend enabling this option.  The NFS attribute cache is a local cache of file and directory permissions.  By disabling this cache, a new lookup has to occur each time to validate file and directory permissions.  Expect an increase in IO operations and a decrease in performance if this option is enabled.

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