Modifying an NFS Share Client

Prerequisites

You have created an NFS share client.

Procedure

1. Choose Resources > Resources > Share > NFS Share.
2. Select a desired account from the Account drop-down list in the upper left corner.
3. Click the path of a desired NFS share to enter its details page.
4. In the Permission area, click More on the right of a desired client and select Modify.

   The Modify Client page is displayed.

5. Set client properties.

   Table 1 describes related parameters.

   Table 1 Client parameters

   Parameter	Description
   UNIX Permission Level	Permission level for the UNIX client to access the NFS share, including: Read-only: The client can only read files in the share. Read/Write: The client can read and write files in the share. None: No operation is allowed on the share. NOTE: The permission for an audit log namespace share cannot be set to Read/Write.
   Kerberos5 Permission	Permission level for the Kerberos5 client to access the NFS share, including: Read-only: The client can only read files in the share. Read/Write: The client can read and write files in the share. None: No operation is allowed on the share. This parameter applies only to the scenario where the NFS Kerberos service is configured. NOTE: The permission for an audit log namespace share cannot be set to Read/Write.
   Kerberos5i Permission	Permission level for the Kerberos5i client to access the NFS share, including: Read-only: The client can only read files in the share. Read/Write: The client can read and write files in the share. None: No operation is allowed on the share. This parameter applies only to the scenario where the NFS Kerberos service is configured. NOTE: The permission for an audit log namespace share cannot be set to Read/Write.
   Kerberos5p Permission	Permission level for the Kerberos5p client to access the NFS share, including: Read-only: The client can only read files in the share. Read/Write: The client can read and write files in the share. None: No operation is allowed on the share. This parameter applies only to the scenario where the NFS Kerberos service is configured. NOTE: The permission for an audit log namespace share cannot be set to Read/Write.

6. Modify advanced client parameters. Click Advanced.
   Table 2 describes related parameters.

   Table 2 Advanced client parameters

   Parameter	Description
   Write Mode	Set the mode in which the system writes data to disks. Sync: The system writes data onto disks instantly. Async: The system writes data to the cache first. The asynchronous write mode delivers higher write performance. However, if the client and a mount node fail at the same time, data may be lost. NOTE: This parameter is available only when at least one of UNIX Permission Level, Kerberos5 Permission, Kerberos5i Permission, and Kerberos5p Permission is set to Read/Write.
   Permission Constraint	Determine whether to retain the user ID (UID) and group ID (GID) of a shared directory. all_squash: The UID and GID of a shared directory are mapped to user nobody, which is applicable to public directories. no_all_squash: The UID and GID of a shared directory are retained.
   root Permission Constraint	Determine whether to allow the root permission of the client. root_squash: does not allow the client to access the share as user root. Otherwise, the client will be mapped as an anonymous user. no_root_squash: allows the client to access the share as user root that has full control and access permissions for shared directories. NOTE: If a VM needs to be created in the NFS share, set root Permission Constraint to no_root_squash. Otherwise, the VM may run abnormally.
   Source Port Verification Constraint	Determine whether to enable source port verification. secure: allows the clients to access the NFS share using ports 1 to 1023. insecure: allows the clients to access the NFS share using any port.
   High-Performance Write Mode	High-performance NFS asynchronous write mode of a Windows client. When NFS shares are mounted on a Windows client, if the high-performance write mode is enabled, the storage system forcibly writes data to the cache to improve write performance. The default value is Disable. NOTE: This parameter is available only when UNIX Permission Level is set to Read/Write and Write Mode is set to Async. When the high-performance NFS asynchronous write mode of the Windows client is enabled, data in the cache may be lost if the storage system is faulty. Before enabling the high-performance write mode, ensure that: The NFS share permission is configured for the Windows client. Services on the Windows client have high requirements on performance.

7. Click OK.