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Configuring Services
Minimum supported version - Use this drop-down list to control which versions of NFS
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the appliance supports.
Maximum supported version - Use this drop-down list to control which versions of NFS
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the appliance supports.
Note -
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.
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 NFS v4 clients (NFS v3 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 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
without incurring the grace period delay.
Custom NFSv4 identity domain - Use this property to define the domain for mapping
■
NFSv4 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.
Use NFSv4 numeric id strings - Use this property to allow NFSv4 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.
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 mounts.
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Oracle ZFS Storage Appliance Administration Guide, Release OS8.6.x • September 2016
Setting the NFS minimum and maximum versions to the same value causes the
. For planned outages, the NFS service processes all requests for service
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