So I started some practice questions today from the official guide. One of which being...
Overview: A new fiber-based logical storage device (LUN) has been presented to your host cluster and is managed by the VMware Native Multipathing Plug-in. The logs on one ESXi host indicate intermittent issues with the new LUN. No datastores or virtual machines (VMs) are currently using the LUN.
Objectives: Temporarily change the masking on the host such that it cannot access the LUN.
Specific Requirements: You need to use the ESXi shell or vCLI to execute commands to mask a LUN whose ID is naa.600601604550250018ea2d38073cdf11 from an ESXi host.
My answer was as follows in essence in my single host lab with no FC...
esxcli storage core claimrule add -r946 -t transport -R fc -P MASK_PATH --device=naa.600601604550250018ea2d38073cdf11 (I figured this would mask the specific device, and the command took ok)
esxcli storage claim rule list (to confirm its there)
esxcli storage claimrule load (to load it)
But apparently my answer should have been as shown below. Can someone please explain what my answer would have achieved if anything? I have gone through so much study material that I feel like I have forgotten claim rules and clearly will need a revisit. I can't really do this properly in the lab I feel since I only have ISCSI.
1. Execute these commands to list all the paths for the LUN:
esxcfg-mpath -b -d naa.600601604550250018ea2d38073cdf11
2. Examine the results. For this example, assume the paths are vmhba33:0:0:0, vmhba33:0:1:0, vmhba33:0:2:0, and vmhba33:0:3:0.
3. Execute this command to display the current claim rules:
esxcli storage core claimrule list
4. Examine the results. For this example, assume the rule numbers 192–195 are unused and the rule that currently claims the LUN has a number greater than 195.
5. Execute these commands to add claim rules (to assign each of the LUN’s paths to the MASK_PATH plug-in):
esxcli storage core claimrule add --rule 192 -t location -A vmhba33 -C 0 -T 0 -L 0 -P MASK_PATH
esxcli storage core claimrule add --rule 193 -t location -A vmhba33 -C 0 -T 1 -L 0 -P MASK_PATH
esxcli storage core claimrule add --rule 194 -t location -A vmhba33 -C 0 -T 2 -L 0 -P MASK_PATH
esxcli storage core claimrule add --rule 195 -t location -A vmhba33 -C 0 -T 3 -L 0 -P MASK_PATH
6. Execute this command to load the new rule set:
esxcli storage core claimrule load
7. Execute these commands to unclaim all the LUN’s paths from the currently assigned plug-in and reclaim the paths on the newly assigned plug-in.
esxcli storage core claiming reclaim -d naa.600601604550250018ea2d38073cdf11
esxcli storage core claiming unclaim -d naa.600601604550250018ea2d38073cdf11 -t location
esxcli storage core claimrule run
8. Rescan the HBAs and verify the LUN is no longer present.
