Oracle ZFS Storage Appliance: DNS caching behavior on the Oracle ZFS Storage Appliance

Asset ID:	1-71-1954282.1
Update Date:	2018-05-02
Keywords:

Solution Type Technical Instruction Sure

Solution 1954282.1 : Oracle ZFS Storage Appliance: DNS caching behavior on the Oracle ZFS Storage Appliance

Related Items


Sun ZFS Storage 7320
 Oracle ZFS Storage ZS3-BA
 Sun Storage 7210 Unified Storage System
 Oracle ZFS Storage ZS3-2
 Sun Storage 7410 Unified Storage System
 Oracle ZFS Storage ZS3-4
 Sun ZFS Storage 7420
 Sun Storage 7310 Unified Storage System
 Sun ZFS Storage 7120
 Sun Storage 7110 Unified Storage System

Related Categories


PLA-Support>Sun Systems>DISK>ZFS Storage>SN-DK: 7xxx NAS

In this Document

Goal

Solution

Created from <SR 3-9990364281>

Applies to:

Oracle ZFS Storage ZS3-BA - Version All Versions to All Versions [Release All Releases]
Sun Storage 7410 Unified Storage System - Version All Versions to All Versions [Release All Releases]
Oracle ZFS Storage ZS3-2 - Version All Versions to All Versions [Release All Releases]
Oracle ZFS Storage ZS3-4 - Version All Versions to All Versions [Release All Releases]
Sun ZFS Storage 7320 - Version All Versions to All Versions [Release All Releases]
7000 Appliance OS (Fishworks)

Goal

This document describes DNS caching behavior on the Oracle ZFS Storage Appliance.

Solution

The DNS name service cache daemon (nscd) starts by default when the appliance boots.

As with the DNS service itself, there is no supported method of disabling nscd, nor can it be configured; therefore, running without it is not supported.

Successful DNS lookups are cached on the appliance for an hour. 'No' results are not cached and in such cases, lookup requests will always be made to the DNS nameserver.

Including reverse DNS entries in addition to forward (normal) DNS entries on the nameserver could reduce the number of unnecessary lookups, but is beyond the scope and subject of this document.

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