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I have an iSCSI target with several LUNs on it. Right now they are configured as datastores in vSphere; what I'd like to do is delete one of these datastores (thus freeing up an LUN) then build a VM that directly accesses the same target but only the one LUN (the recently deleted one). Is this safe, or will the initiator possibly send iSCSI commands that should be innocuous but could cause corruption on LUNs that I'm not even using?

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I do not see a problem if access restrictions on the storage volumes are managed correctly. On most systems you can register initiators and assign specific LUNs to them. Also you could use CHAP to protect from forged initiator names. –  Dmitri Chubarov Feb 27 at 12:31

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