Unable to view confluence sandbox process running on the server

[Chinmay]

I am currently using confluence 6.13.4 Data Center.

I have followed below post in order to configure the sandbox for handling resource intensive thumbnail images,

https://confluence.atlassian.com/conf611/document-conversion-sandbox-for-confluence-data-center-956138729.html

I have configured below system properties using -D parameters on the server,

conversion.sandbox.pool.size=2
document.conversion.sandbox.request.time.limit.secs=30
conversion.sandbox.memory.limit.megabytes=512

I had the following queries,

1. How can I view/validate the sandbox process running on the server?
2. Where will be the thumbnail image stored on the server?