Hi Shanthakumar,
You can run 'bosh tasks -r=10' to get the last 10 tasks run by bosh (you increase the number to find older tasks).
The following example is looking for all create deployment tasks for service instances in the last 1000 tasks.
bosh tasks -r=1000 | grep 'service-instance_' | grep 'create deployment'
If you run the following you should find the task you are looking for:
bosh tasks -r=1000 | grep 'service-instance_' | grep 'create deployment' | grep 6e79ed39-5938-4c86-8899-220b5a065691
Once you find the task you can run 'bosh task <task number>' to get the task details. You can also add --debug or --cpi for further information about the task.
Regards,
Mark