Supported ONTAP SMB versions and functionality
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Server Message Block (SMB) is a remote file-sharing protocol used by Microsoft Windows clients and servers. ONTAP supports all SMB versions. You should verify that the ONTAP SMB server supports the clients and functionality required in your environment.
The latest information about which SMB clients and domain controllers ONTAP supports is available in the Interoperability Matrix Tool.
SMB 2.0 and later versions are enabled by default for ONTAP SMB servers and can be enabled or disabled as needed. Similarly, SMB 1.0 can be enabled or disabled as needed.
Beginning with ONTAP 9.20.1, ONTAP supports SMB normalized name queries for open files and directories. Windows clients can retrieve canonical file and directory names in a single request.
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Default settings for SMB 1.0 and 2.0 connections to domain controllers also depend on the ONTAP version. Learn more about the |
The following table shows which SMB features are supported in each SMB version. Some SMB features are enabled by default and some require additional configuration.
| This functionality: | Requires enablement: | Is supported in ONTAP 9 for these SMB versions: | |
|---|---|---|---|
3.0 |
3.1.1 |
||
Legacy SMB 1.0 functionality |
X |
X |
|
Durable handles |
X |
X |
|
Compounded operations |
X |
X |
|
Asynchronous operations |
X |
X |
|
Increased read and write buffer sizes |
X |
X |
|
Increased scalability |
X |
X |
|
SMB signing |
X |
X |
X |
Alternate Data Stream (ADS) file format |
X |
X |
X |
Large MTU (enabled by default beginning with ONTAP 9.7) |
X |
X |
X |
Lease oplocks |
X |
X |
|
Continuously available shares |
X |
X |
X |
Persistent handles |
X |
X |
|
Witness |
X |
X |
|
SMB encryption: AES-128-CCM |
X |
X |
X |
Scale out (required by CA shares) |
X |
X |
|
Transparent failover |
X |
X |
|
SMB Multichannel (beginning with ONTAP 9.4) |
X |
X |
X |
Preauthentication integrity |
X |
||
Cluster client failover v.2 (CCFv2) |
X |
||
SMB encryption: AES-128-GCM |
X |
X |
|
Normalized name query support for Windows clients (beginning with ONTAP 9.20.1) |
X |
X |
|