Limitations of ONTAP support for NFSv4


You should be aware of several limitations of ONTAP support for NFSv4.

  • The delegation feature is not supported by every client type.

  • In ONTAP 9.4 and earlier releases, names with non-ASCII characters on volumes other than UTF8 volumes are rejected by the storage system.

    In ONTAP 9.5 and later releases, volumes created with the utf8mb4 language setting and mounted using NFS v4 are no longer subject to this restriction.

  • All file handles are persistent; the server does not give volatile file handles.

  • Migration and replication are not supported.

  • NFSv4 clients are not supported with read-only load-sharing mirrors.

    ONTAP routes NFSv4 clients to the source of the load-sharing mirror for direct read and write access.

  • Named attributes are not supported.

  • All recommended attributes are supported, except for the following:

    • archive

    • hidden

    • homogeneous

    • mimetype

    • quota_avail_hard

    • quota_avail_soft

    • quota_used

    • system

    • time_backup


    Although it does not support the quota* attributes, ONTAP does support user and group quotas through the RQUOTA side band protocol.