Hi,
An initiator is a piece of software installed on a host/server that allows you to connect to your storage via network. An initiator group typically is where you would add the information of your host/servers initiator to grant access to volumes or LUNs. In Other words, Initiator is a member of the initiator group, initiator group is used to grant access to a volume or group of volumes.Once the Lun/Volume is online on the host you can assign any drive letter of our choice.
Check the following Link for more information on mapping.
https://library.netapp.com/ecmdocs/ECMP1204463/html/GUID-1E29B3F8-1E6E-4383-BCA7-EE0BABCFB46D.html
Hope this helps.
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