Troubleshoot Drive Down issue

Hi All,

I'm new here in Netbackup. Kindly help me out to fix this issue.

We are using Netbackup 7.5, in our environment both the master and media server are the same, we have 4 drives out of which 2 drives goes down frequently.

We had even tried to start up the drive manually but again its going down.

Kindly help me out in this issue, with the basic troubleshooting too..