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Why is used space less on NetApp CIFS after data migration from another storage?

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ontap-9
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Applies to

  • ONTAP 9
  • CIFS

Answer

After migrating CIFS data from a third-party storage system to NetApp ONTAP, users may observe that the used space reported on NetApp CIFS shares appears lower than what was shown on the source storage. This difference is expected and does not indicate missing data.
 
NetApp ONTAP uses storage efficiency technologies such as:
These features significantly reduce the physical space required to store the same logical data. As a result, ONTAP may report lower used capacity even though the actual data content remains intact and accessible.
 
To verify data integrity, users can compare file counts, perform checksums, or validate application-level access post-migration.

Additional Information

After migrating data to a NetApp volume, use the following ONTAP CLI commands to verify space usage and efficiency:

volume show-space -vserver <svm name> -volume <vol name> -instance

volume efficiency show -volume <vol name> -instance

volume show -volume <vol name> -fields size,used,available,dedupe-space-saved,dedupe-space-saved-percent,compression-space-saved,compression-space-saved-percent,snapshot-space-used

NetApp provides no representations or warranties regarding the accuracy or reliability or serviceability of any information or recommendations provided in this publication or with respect to any results that may be obtained by the use of the information or observance of any recommendations provided herein. The information in this document is distributed AS IS and the use of this information or the implementation of any recommendations or techniques herein is a customer's responsibility and depends on the customer's ability to evaluate and integrate them into the customer's operational environment. This document and the information contained herein may be used solely in connection with the NetApp products discussed in this document.