Can't wipe old boot drive

I have upgraded my cluster to new boot drives using zfs1 mirroring on sdc and sdd. All is going well. I want to remove the old drives from the chassis. I wanted to wipe the drives using proxmox before I do. I am trying to remove sda When I try to wipe the drive I get the error `disk/partition '/dev/sda3' has a holder (500)` google foo says that process # 500 is holding. Here is what process 500 is `500 ? I 0:02 [kworker/23:1-mm_percpu_wq]`. I know I can...

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