some days ago we had big troubles with our database which was corrupted and refused the connection. I checked when we had a stable state of it and did a quick rollback via veeam so that the disks were exactly in the state of the point in time where the database seemed to be ok. So far so good, everything was working fine and within some minutes we were online again.
But guess what, this was just the beginning of the story... Some minutes later I realized that a specific operation had caused the same problem again and I tried to rollback again via veeam to the same point in time. But this time, veeam didn't use CBT, it took 3 hours to write the whole disk back to the original vm which was very very painful at that moment.
Can please someone explain to me why quick rollback using CBT only worked for the first time?