Had a SAS controller failure on a Dell R710, that house Exchange 2010, so was trying to stand up Exchange 2013 in coexistence mode, as I got Exchange 201 VM back up. On another R710, I had the DC 2009 R2 on a VM, so on a 3rd R710, I started a 2012R2 AD and joined to domain so I could use the second R710 as a host for 1st that failed to export VMs and save them.
The DNS for whole network went down and I discovered the DC on the second R710 had stopped, Tried to start it, but got failure to initialize 0x80070005. I noticed that the avhd file no longer exists.