We had the similar issue and recently we have observed that some source folders are missing under QDS automatically and had to recreate all the tasks. Any reason why we see source folders missing. Also it be good idea if we have a way to restore all the tasks back as Faisal asked.
We are on 11 SR2 440 build and have clustered QVS and Clustered QDS.
That's the good idea and we thought about it. But if we restore we loose all the changes happened from the time we lost source folder. For example we have observed 10 days after it disappeared with the task next scheduled run.
this solution might work for Faisal.
Has any one experienced this same behaviour (source folder disappeared in QDS)