low are new LUNs discovered by an ESXi host?
A.
A rescan operation is periodically performed by ESXi hosts to detect new LUNs.
B.
A reboot operation is required every time a LUN is added.
C.
A manual rescan operation is required every tame a LUN is added.
D.
ESXi hosts automatically detect new LUNs as they are presented.
Explanation:
iSCSI SAN Configuration Guide, page 26.
The VMkernel discovers LUNs when it boots, and those LUNs are then visible in the vSphere Client. If changes are made to the LUNs, you must rescan to see those changes.
New LUNs created on the iSCSI storage
Changes to LUN access control
Changes in connectivity
i added hundreds of luns to ESX farms without ever booting. While the text in the iSCSI conf guide is correct, to induce a reboot is required is simply wrong. You cant induce – you have to deduce!
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My experience is “Rescan All…” can’t find my new LUN on a FC SAN. I have to go through “Add Storage”. But definitely not require a reboot. I think C might be the correct answer. As A and D are talking about the same thing.
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I would say B is incorrect because it says a reboot is REQUIRED, which is not true. While the host will detect new LUNs on boot, it is not required as you can click the manual rescan button.
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As per my experience C is correct. There is no need of reboot after adding LUN.
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D
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