Help on Protocols > UNIX Sharing (NFS)

Current Access Zone:

From this drop-down list, select the access zone in which you want to manage NFS export settings.

Root User Mapping

Displays whether you have selected the default root user or a custom root user.

If you selected Use default, the default settings display in the field. The default settings establish a root-squashing rule for this export, which prevents users -- regardless of their credentials on the NFS client -- from gaining root privileges on the NFS server. The default settings are:

User: nobody 
Primary Group:  No primary group 
Secondary Group: No secondary groups

If you selected Use custom, the field expands and custom root user options display. If you select the Do not map failed user lookups radio button, no map root user is specified. If you select the Map failed user lookups to a specified user radio button:

User: Enter the name of the map root user, or click Browse to access a search window.

Primary Group: Enter the name of the primary group for the map root user, or click Browse to access a search window.

Secondary Groups: Click Add a group to access the Select a Group popup window, in which you can manually enter group names or search for them. You may specify multiple secondary groups.

Non-Root User Mapping

Displays whether you have specified a non-root user for the export. User mapping is disabled by default. Specify this setting on a per-export basis, when appropriate. If you select Use Custom, this field expands and the same fields used in the Map Root User custom screen display.

Failed User Mapping

Displays whether you have specified a non-root user for the export. User mapping is disabled by default. Specify this setting on a per-export basis, when appropriate. If you select Use Custom, this field expands and the same fields used in the Map Root User custom screen display.

Security Flavors

UNIX system security is the default. If you select Use Custom, you can also select Kerberos5, Kerberos5 Integrity and Kerberos5 Privacy.

Advanced Default Export Settings

To display advanced export settings, click Show Advanced Settings. We recommend that you do not change advanced settings unless it is necessary and you fully understand the consequences of these changes.

Block Size: The block size used to calculate block counts for NFSv3 FSSTAT and NFSv4 GETATTR requests. The default value is 8 KB.

Commit Asynchronous: If set to Yes, allows NFSv3 and NFSv4 COMMIT operations to be asynchronous. The default value is No.

Directory Transfer Size: The preferred directory read transfer size reported to NFSv3 and NFSv4 clients. The default value is 128 KB.

Read Transfer Max Size: The maximum read transfer size reported to NFSv3 and NFSv4 clients. The default value is 1 MB.

Read Transfer Multiple: The recommended read transfer size multiple reported to NFSv3 and NFSv4 clients. The default value is 512 bytes.

Read Transfer Preferred Size: The preferred read transfer size reported to NFSv3 and NFSv4 clients. The default value is 128 KB.

Readdirplus Prefetch: Do not use.

Setattr Asynchronous: If set to Yes, performs set attribute operations asynchronously. The default value is No.

Write Datasync Action: The action to perform for DATASYNC writes. The default value is DATASYNC.

Write Datasync Reply: The reply to send for DATASYNC writes. The default value is DATASYNC.

Write Filesync Action: The action to perform for FILESYNC writes. The default value is FILESYNC.

Write Filesync Reply: The reply to send for DATASYNC writes. The default value is FILESYNC.

Write Transfer Max Size: The maximum write transfer size reported to NFSv3 and NFSv4 clients. The default value is 1048576 bytes.

Write Transfer Multiple: The recommended write transfer size multiple reported to NFSv3 and NFSv4 clients. The default value is 512 bytes.

Write Transfer Preferred: The preferred write transfer size reported to NFSv3 and NFSv4 clients. The default value is 524288 bytes.

Write Unstable Action: The action to perform for unstable writes. The default value is UNSTABLE.

Write Unstable Reply: The reply to send for unstable writes. The default value is UNSTABLE.

Max File Size: Specifies the maximum file size to allow. This setting is advisory in nature and is returned to the client in a reply to an NFSv3 FSINFO or NFSv4 GETATTR request. The default value is 8 EB.

Readdirplus Enable: Enables the use of the NFSv3 readdirplus service, whereby a client can send a request and receive extended information about the directory and files in the export. The default is Yes.

Return 32 bit File IDs: Specifies return 32 bit file IDs to the client. The default is No.

Can Set Time: When this setting is enabled, OneFS allows the NFS client to set various time attributes on the NFS server. The default value is Yes.

Encoding: Overrides the general encoding settings the cluster has for the export. The default value is DEFAULT.

Map Lookup UID: Looks up incoming user identifiers (UIDs) in the local authentication database. The default value is No.

Symlinks: Informs the NFS client that the file system supports symbolic link file types. The default value is Yes.

Time Delta: Sets the server clock granularity. The default value is 1 nanosecond.