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Exhibit You have a 4-node ONTAP cluster and use FCP to access several LUNs. You perform a volume move to move a LUN (/vol/sql01_sysdb/lun) from node na01-01 to na01-03. After the move, you perform an HBA rescan from the host, but ALUA Is now seeing twice the number of paths to the LUN. Referring to the exhibit, which action would solve the problem?
Correct Answer: A
Explanation The correct action to solve the problem is to update the Selective LUN Map configuration for the LUN mapping. Selective LUN Map (SLM) is a feature that enables you to control which LUNs are visible to which hosts in an ONTAP cluster. SLM reduces the number of paths that are presented to the host and improves the performance and manageability of the SAN environment1. When you perform a volume move, the LUN mapping is automatically updated to include the new node as a destination node, but the old node remains as a source node until the move is completed. This causes ALUA to see twice the number of paths to the LUN, as both nodes are active for the LUN. To avoid this, you need to update the SLM configuration to remove the source node from the LUN mapping after the volume move is done2. Changing the MPIO policy on the host, ensuring that the fabric zoning is correct, or rebooting the host are not actions that would solve the problem, as they do not affect the LUN mapping or the ALUA state. References :- Selective LUN Map overview, How to use Selective LUN Map (SLM) with Volume Move
