Considerations for SAN configurations in a MetroCluster environment

You must be aware of certain considerations when using SAN configurations in a MetroCluster environment.

Two-node, four-node, and eight-node MetroCluster configurations do not support front-end FC fabric routed vSAN configurations.
Two-node, four-node, and eight-node MetroCluster configurations support SAN protocols.
When using SAN client configurations, you must check whether any special considerations for MetroCluster configurations are included in the notes that are provided in the Interoperability Matrix Tool (IMT).
The NVMe protocol is not supported on MetroCluster configurations.

The MetroCluster is using the same WWPNs on both sides of the front-end SAN.

To avoid overlap when the old port goes offline and the new port comes online, use the following steps to configure the front-end switches:

For a..	Use these steps:
Cisco switch	Step 1. Connect to the switch and log in. Step 2. Enter configuration mode: switch# config t switch(config)# Step 3. Overwrite the first device entry in the name server database with the new device: switch(config)# no fcns reject-duplicate-pwwn vsan 1
Brocade switch	Step 1. Connect to the switch and log in. Step 2. Enter the switchDisable command. Step 3. Enter the configure command, and press `y` at the prompt. F-Port login parameters (yes, y, no, n): [no] y Step 4. Choose setting 1: - 0: First login take precedence over the second login (default) - 1: Second login overrides first login. - 2: the port type determines the behavior Enforce FLOGI/FDISC login: (0..2) [0] 1 Step 5. Respond to the remaining prompts, or press Ctrl + D. Step 6. Enter the switchEnable command.

For a..

Use these steps:

Cisco switch

Step 1. Connect to the switch and log in.

Step 2. Enter configuration mode:

switch# config t
switch(config)#

Step 3. Overwrite the first device entry in the name server database with the new device:

switch(config)# no fcns reject-duplicate-pwwn vsan 1

Brocade switch

Step 1. Connect to the switch and log in.

Step 2. Enter the switchDisable command.

Step 3. Enter the configure command, and press y at the prompt.

   F-Port login parameters (yes, y, no, n): [no] y

Step 4. Choose setting 1:

   - 0: First login take precedence over the second login (default)
   - 1: Second login overrides first login.  
   - 2: the port type determines the behavior
   
   Enforce FLOGI/FDISC login: (0..2) [0] 1

Step 5. Respond to the remaining prompts, or press Ctrl + D.

Step 6. Enter the switchEnable command.

For further MetroCluster-specific host information, refer to the following NetApp Knowledgebase articles:

What are AIX Host support considerations in a MetroCluster configuration?

Solaris host support considerations in a MetroCluster configuration