iRule for sorry page with pool and path

About the question on how to host the page on the f5, there's ton's of articles on how to do that on DC. These should send you down the right track:

Here's the article about HTTP respond:

https://devcentral.f5.com/wiki/iRules.HTTP__respond.ashx

Here's a few examples:

https://devcentral.f5.com/questions/serve-status-page-with-images-on-ltm-v102

https://devcentral.f5.com/questions/irule-maintanance-page-with-ifile

You can manually trigger LB_FAILED by creating a pool with mock members, or disable all members in a pool and then test it out.

You can always write back if you run into trouble. :)

/Patrik