NFS Client Mount Parameter Description

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最終更新日: 2026-04-08 15:13:54

This article describes common NFS client mount options to help you better understand different NFS mount option parameters and applicable scenarios. This document focuses on describing the meaning of the parameters and parameters that may require additional adjustments to meet access requirements in specific scenarios.
Note:
On the file system mount parameters page and the client assistant interface, Tencent Cloud recommended mount parameters have been provided. You can perform the mount operation based on the recommended configuration.
Description of Common Mount Parameters
Parameter
Parameter Description
vers
Indicates the version of the NFS protocol used.
3: indicates that NFS version 3 is used for mounting.
4.0: indicates that NFS version 4 is used for mounting.
Note:
It is recommended to pass vers=3 to use the NFS V3 protocol to obtain better metadata performance. If multiple clients need to edit the same file, vers=4/ can be passed.
hard/soft
hard: When CFS is unavailable, the client will automatically retry.
soft: When CFS is unavailable, the client will directly return an EIO error.
Note:
This parameter defaults to hard.
It is recommended to use the default configuration. When a primary/secondary switchover occurs in the CFS backend, the client can automatically reconnect to ensure service availability.
noresvport
Using a new TCP port during network reconnection ensures that the connection is not interrupted when network failure recovery occurs.
Note:
It is recommended to configure this. When a primary/secondary switchover occurs in the CFS backend, internal ports are replaced. This parameter must be added to ensure normal service recovery after the switchover.
ac/noac
ac: metadata information of cached files.
noac: does not cache file metadata.
Note:
This parameter defaults to ac.
It is recommended to use the default configuration for better performance.
If high consistency level is required for multi-client data reading, which is common in various workflow scenarios, it can be set to noac.
sync
After configuration, data writes will switch to synchronous writes.
Note:
It is recommended not to add this parameter to ensure better performance. If a high consistency level is required, which is common in various workflow scenarios, this parameter can be configured.
lock/nolock
nolock: switches file locking semantics to local lock without throwing errors.
lock: enable file lock semantics. If the server does not support file locks, the lock request will throw an error.
Note:
Defaults to lock. It is recommended to configure nolock when you mount with the NFS V3 protocol to ensure file locks function properly when invoked by the application.
Note:
For a more complete set of NFS client mount parameters, please refer to the official link MAN NFS.

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NFS Client Mount Parameter Description

Description of Common Mount Parameters

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Parameter	Parameter Description
vers	Indicates the version of the NFS protocol used. 3: indicates that NFS version 3 is used for mounting. 4.0: indicates that NFS version 4 is used for mounting. Note: It is recommended to pass vers=3 to use the NFS V3 protocol to obtain better metadata performance. If multiple clients need to edit the same file, vers=4/ can be passed.
hard/soft	hard: When CFS is unavailable, the client will automatically retry. soft: When CFS is unavailable, the client will directly return an EIO error. Note: This parameter defaults to hard. It is recommended to use the default configuration. When a primary/secondary switchover occurs in the CFS backend, the client can automatically reconnect to ensure service availability.
noresvport	Using a new TCP port during network reconnection ensures that the connection is not interrupted when network failure recovery occurs. Note: It is recommended to configure this. When a primary/secondary switchover occurs in the CFS backend, internal ports are replaced. This parameter must be added to ensure normal service recovery after the switchover.
ac/noac	ac: metadata information of cached files. noac: does not cache file metadata. Note: This parameter defaults to ac. It is recommended to use the default configuration for better performance. If high consistency level is required for multi-client data reading, which is common in various workflow scenarios, it can be set to noac.
sync	After configuration, data writes will switch to synchronous writes. Note: It is recommended not to add this parameter to ensure better performance. If a high consistency level is required, which is common in various workflow scenarios, this parameter can be configured.
lock/nolock	nolock: switches file locking semantics to local lock without throwing errors. lock: enable file lock semantics. If the server does not support file locks, the lock request will throw an error. Note: Defaults to lock. It is recommended to configure nolock when you mount with the NFS V3 protocol to ensure file locks function properly when invoked by the application.