Methods for specifying destination systems on the SnapMirror source
There are two methods of specifying destination systems on the source systems.
The two methods to specify destination systems on the source are:
By using the snapmirror.access option
By using the snapmirror.allow file
Specifying SnapMirror destinations using the snapmirror.access option
You can specify the destination systems that are allowed access to the source system by using the snapmirror.access option. This option specifies which SnapMirror destination system can initiate transfers, and which network interfaces they can use. This is the preferred method for controlling SnapMirror access on SnapMirror source system.
Specifying SnapMirror destinations using the snapmirror.allow file
You can create a snapmirror.allow file in the /etc/ directory on the source system. You can create entries in the snapmirror.allow file to specify the destination systems that are allowed to copy data directly from the source system. If the snapmirror.access option is set to legacy (the default setting), the snapmirror.allow file defines the access permissions.
Resolving host names to their IP addresses
By default, SnapMirror checks host names in the /etc/snapmirror.allow file against the host name sent from the destination system. Alternatively, you can set SnapMirror to resolve the host names in the /etc/snapmirror.allow file to their IP addresses, and compare them with the IP address of the destination system.