Mysteriously enough, one of our client's VDP is now working 100%. The above issue was occurring. Our assumption was since they didn't purchase SAS Drives for their storage HDs and instead had either Near Line SAS or even SATA drives. We bought another set of drives and created a separate RAID Volume and installed VDP on that volume. This way the I/O could be separated. I installed VDP on the new volumes and attempted backups, but for some weird reason it didn't work and still showed the same issue. Some time went by before getting back to it and all the VDP jobs were not linked anymore to the VMs. I re-linked all the VDP jobs and the next time VDP ran the jobs everything was successful. I'm unsure how the link was broken, but that might have been the key to the successful backups now. I have been getting good VDP backups for over a month and a half now. Hopefully this may help with your situation.
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