We have few ESXI machines managed by Vcenter (all have same 6.5 version). Today when we tried to upgrade compatibility on one vm guest using Vcenter, it gave following error.
Cannot complete operation due to concurrent modification by another operation
After some troubleshooting, it came to my knowledge that there was a pending snapshot made by Veeam B&R software, that was causing the issue. After removal of this snapshot, the compatibility upgraded worked fine, & later we moved this VM from one esxi to another dueto resource strains.
Case#2
In one another encounter, whenever we tried to edit the guest VM setting, it gave error “Invalid configuration for device ‘1’.” , for this particular case we simply remove the affected guest VM from the inventory & re-added it and the problem got solve.
