Cold Start means that Integration Service will restart a task or workflow without recovery. You can restart task or workflow without recovery by using a cold start.
Now Recovering a workflow means to restart processing of the workflow or tasks from the point of interruption of the workflow or task. By default, the recovery strategy for Workflow tasks is to fail the task and continue running the workflow. Else you need to configure the recovery strategy.
To restart a task or workflow without recovery:
1. You can select the task or workflow that you want to restart.
2. Right click > Cold Start Task or Cold Start Workflow.