NFS Service Properties
The following NFS Service properties are available in Configuration > Services. Note that NFSv4 is also known as NFSv4.0.
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Minimum supported version - Use this drop-down list to control which versions of NFS the appliance supports.
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Maximum supported version - Use this drop-down list to control which versions of NFS the appliance supports.
Note - Setting the NFS minimum and maximum versions to the same value causes the appliance to only communicate with clients using that version. This may be useful if you find an issue with one NFS version or the other (such as the performance characteristics of an NFS version with your workload), and you want to force clients to only use the version that works best. -
Maximum # of server threads - Define the maximum number of concurrent NFS requests (from 20 to 1000). This should at least cover the number of concurrent NFS clients that you anticipate. The default value is 500.
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Grace period - Define the number of seconds that all clients have to recover locking state after an appliance reboot (from 15 to 600 seconds) from an unplanned outage. This property affects only NFSv4.0 and NFSv4.1 clients (NFSv3 is stateless so there is no state to reclaim). During this period, the NFS service only processes reclaims of the old locking state. No other requests for service are processed until the grace period is over. The default grace period is 90 seconds. Reducing the grace period lets NFS clients resume operation more quickly after a server reboot, but increases the probability that a client cannot recover all of its locking state. The Oracle ZFS Storage Appliance provides grace-less recovery of the locking state for NFSv4.0 and NFSv4.1 clients during planned outages. Planned outages occur during events such as updates and appliance reboot using the CLI maintenance system reboot command or the BUI power icon
. For planned outages, the NFS service processes all
requests for service without incurring the grace period delay. -
Custom NFSv4 identity domain - Use this property to define the domain for mapping NFSv4.0 and NFSv4.1 users and group identities. If you do not set this property, the appliances uses DNS to obtain the identity domain, first by checking for a _nfsv4idmapdomain DNS resource record, and then by falling back to the DNS domain itself.
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Use NFSv4 numeric id strings - Use this property to allow NFSv4.0 and NFSv4.1 clients to use numeric strings for user and group IDs. If you do not set this property, user and group IDs are exchanged in the form of user@domain, the default. This property applies only when the authentication type is AUTH_SYS. The CLI property is use_numeric_ids.
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Enable NFSv4 delegation - Select this property to allow clients to cache files locally and make modifications without contacting the server. This option is enabled by default and typically results in better performance; but in rare circumstances it can cause problems. You should only disable this setting after careful performance measurements of your particular workload and after validating that the setting has a measurable performance benefit. This option only affects NFSv4.0 and NFSv4.1 mounts.
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Mount visibility - This property lets you limit the availability of information about share access lists and remote mounts from NFS clients. Full allows full access. Restricted restricts access such that a client can see only the shares which it is allowed to access. A client cannot see access lists for shares defined at the server or remote mounts from the server done by other clients. The property is set to Full by default.
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Oracle Intelligent Storage Protocol - The NFSv4.0 and NFSv4.1 services include support for the Oracle Intelligent Storage Protocol, which lets Oracle Database NFSv4.0 and NFSv4.1 clients pass optimization information to the ZFS Storage Appliance NFSv4.0 and NFSv4.1 server. For more information, see Oracle Intelligent Storage Protocol.
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