Ensure that Storage DRS and Storage I/O are not configured to use this device.Unregister all objects from the datastore including VMs and templates.In this blog, I want to focus on the correct way to delete and unpresent a LUN in ESXi 5. What happened is while the datastore was deleted, ESXi continued to try and access that device and since ESXi uses hostd to access devices and also uses hostd for ESXi to vCenter communications, that led to a slew of issues.
That led to the condition knows as APD (All paths Down). I have recently been working with a customer that was having an issue with ESXi 5, the problem was that the client unpresented a physical LUN to ESXi 5 by simply deleting the datastore and physically removing the LUN from the storage array software. How To Properly Un-Present a LUN in ESXi 5
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