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. That led to the condition knows as APD (All paths Down).
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. In this blog, I want to focus on the correct way to delete and unpresent a LUN in ESXi 5. Here are the steps:
Now if you are trying to unmount an RDM, first delete the RDM from the virtual machine and delete from disk, then follow steps 5 to 8.
Posted by Elias Khnaser on 01/25/2012 at 12:49 PM
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