From the picture it looks like an lsi adapter. You should be able to use their megaraid adapter software to look at the raid status. Would work for a hba too.
Also the 100% activity looks not good for an idle machine
Like everyone said kapton tape is what to use. One of its back in the day purpose was masking for solder reflow. So will take temperature. The silicone adhesive may not seem to be "sticky" but its designed like that and will work.
Just need to clean substrate as said above