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Dell NetWorker 19.9 Administration Guide

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Multi-subnet cluster configuration support for SQL AAG

Backup and restore operations in a multi-subnet environment can be successfully run without manual intervention to select the active IP address of the cluster.

The following attributes have been added to the resource type, NSRLA, and can be updated using nsradmin command prompt:

Table 1. AttributesThis table contains descriptions about
Attribute Information
Multi-subnet state Specifies whether the multi-subnet state is enabled or disabled. Restart the NetWorker services after this attribute is updated. It is recommended to enable this attribute only from the server.
TCP Retry Specifies the number of attempts taken to connect to a particular host before considering the connection attempt as a failure. For example, if the TCP Retry attribute is set to 5, during the first attempt, NetWorker iterates through all the entries in the DNS for that particular host and there is timeout after 2 seconds if the host is unreachable on the particular entry. It attempts a connection to the next entry in the DNS and waits for 2 seconds.

After the iteration on all the entries is complete for the first attempt, the same operations
are performed on the next retry and the timeout is 4 seconds. The timeout for the third, fourth,
and fifth retry attempts are 8 seconds, 16 seconds, and 32 seconds respectively. The TCP
retry attribute is dependent on the Multi-subnet attribute. It takes effect only when the
Multi-subnet state attribute is set to enabled.
Restart the NetWorker services after this attribute is updated. The default value is 5 and the
maximum supported value is 25.

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