What is the role of an igroup in ONTAP SAN environments?

In NetApp ONTAP SAN environments, an initiator group (igroup) is a logical entity used to group host initiators (such as FC WWPNs or iSCSI IQNs) to control and manage access to LUNs. By mapping a LUN to an igroup, the storage administrator explicitly grants the initiators within that group permission to discover and access the LUN. This mechanism acts as a form of LUN masking, ensuring that only authorized hosts can read or write to the specific block storage volumes, thereby preventing data corruption from unauthorized or accidental host access across the storage area network.

A. Snapshot retention is controlled by Snapshot policies applied to volumes, not by SAN initiator groups.

B. DNS aliases are managed via network name services, whereas igroups are strictly for SAN host access control.

D. Disk temperature and hardware health are monitored by the environment management subsystem, not igroups.

1. NetApp ONTAP 9 Documentation, "Initiator groups (igroups) overview", Section: SAN Administration -> Manage SAN initiators.

2. NetApp Technical Report TR-4080: "Best Practices for Scalable SAN Implementation", Page 12-14.