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https://library.netapp.com/ecmdocs/ECMP1401220/html/GUID-60AA85B1-D1C7-4CEE-9D82-666B18B95C50.html
When a CIFS client first accesses a directory, it triggers the Unicode conversion. If your storage environment already contains existing NFS directories with large numbers of subdirectories and files, the automatic on-first-access conversion can have a performance impact on the storage system. There are methods to prevent this performance impact.
https://kb.netapp.com/app/answers/answer_view/a_id/1029883/~/how-to-determine-if-volumes-contain-non-unicode-directories-
For alternative methods of moving directories to the Unicode format, see BUG 13131: Conversion of large directories to CIFS Unicode format can take a long time . This article describes the procedure for determining whether a volume contains non-Unicode directories, while ensuring that the Unicode conversion is not triggered during the process.
https://library.netapp.com/ecmdocs/ECMM1278400/html/filesag/GUID-E81D3992-5515-44EB-A15C-8BB8D91AF8D0.html
Search within this manual Search all Support content. Creating Unicode-formatted directories. You can use the vol options command to cause Data ONTAP to create all directories in Unicode format. Step. Enter the following command: vol options volume_name ... ©2016 NetApp Contact Us Environmental Compliance How to Buy Feedback Careers Sitemap ...
https://library.netapp.com/ecmdocs/ECMP1401220/html/GUID-4B657FB9-84BA-4C13-AFCB-AF23CE1E3105.html
You can optimize CIFS client access to an NFS directory by configuring Data ONTAP to convert non-Unicode directories to Unicode format when either CIFS clients or NFS clients access directories. You can also configure Data ONTAP to create only Unicode-formatted directories which eliminates the need for Unicode conversion.
https://kb.netapp.com/app/answers/answer_view/a_id/1001394/~/how-do-the-create_ucode-and-convert_ucode-options-control-unicode-conversion-in
If create_unicode is set to on, NFSv3 creates directories in unicode format, else creates them in non-unicode format. If convert_ucode is on, and if NFSv3 attempts to access a non-unicode directory, conversion happen before serving data. If convert_ucode is set to off, then no conversion happens when NFSv3 access non-unicode directory.
https://library.netapp.com/ecmdocs/ECMP1401220/html/GUID-E81D3992-5515-44EB-A15C-8BB8D91AF8D0.html
You can use the vol options command to configure Data ONTAP to create all new directories in Unicode format. This prevents the need for Unicode conversion later when a CIFS client first accesses the directory.
https://kb.netapp.com/app/answers/answer_view/a_id/1003648/~/what-are-the-data-ontap-limitations-on-files%2C-directories%2C-and-subdirectories%3F-
A directory is nothing else than a 'special' file that uses up an inode. The directory contains the inode number and one or more filenames in different formats (Unicode, NFS, 8.3). The number of files that can be stored in any one directory very much depends …
https://community.netapp.com/t5/Network-Storage-Protocols-Discussions/ONTAP-Language-Unicode-UTF-8-UTF-16-Questions/td-p/48827
ONTAP Language / Unicode (UTF-8/UTF-16) Questions markkulacz 2011-03-02 05:34 ... In the statement (which was found on the web) – “Data ONTAP converts a directory format from pre-Data ONTAP 4.0 to Unicode”, what is the “pre-Data ONTAP 4.0 format”? ... or files and directories? The NetApp documentation says that when an iSCSI ...
https://docs.netapp.com/ontap-9/topic/com.netapp.doc.cdot-famg-cifs/GUID-BE7224F5-57F3-4597-A73B-BB907D126A54.html
Beginning with ONTAP 9.5, support for 4-byte UTF-8 encoded names enables the creation and display of file, directory, and tree names that include Unicode supplementary characters outside the Basic Multilingual Plane (BMP). In earlier releases, these supplementary characters did not display correctly in multiprotocol environments.
https://library.netapp.com/ecmdocs/ECMP1196991/html/GUID-E9D7F737-241C-4F1E-9F7A-FB9721097FF2.html
Before copying a directory on a SnapMirror volume that supports CIFS clients, you should ensure that the directories are in the Unicode format. This ensures that the read-only directory copied on the destination is in the Unicode format. This also enables requests through CIFS to access the directory and its files on the destination, and prevents Access denied errors.
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