Masking paths to a LUN

You can remove access to a LUN by masking all of its paths to the ESXi host. This is done at the ESXi host, by using the MASK_PATH PSA plugin to claim the paths to the intended LUN.

In this recipe we will learn how to create a claim rule to mask paths to a chosen LUN.

How to do it…

The following procedure will help you mask paths to a LUN:

1. Get the NAA ID of the LUN that needs to be masked by issuing the following command. The command will list all the NAA IDs seen by the ESXi:

   esxcfg-scsidevs -u
   

2. Get the multipathing information of the LUN by issuing the following command:

   Syntax:

   esxscfg-mpath –l –d <naa-id of the LUN>
   

   Command to be executed:

   esxcfg-mapth –l –d naa.6000eb30adde4c1b0000000000000112
   

   

3. Create a claim rule for each of the paths to the LUN by issuing the following command:

   Syntax:

   esxcli storage core claimrule add –r <rule number> -t location –A <hba> -C <channel number> -L <LUN Number> -P MASK_PATH
   

   Command to be executed:

   esxcli storage...