Broken volume in the Volume Group page

Symptom

A red exclamation mark appears beside the Volume, like the below picture:

Cause

Recording server can't write data into the HDD and the possible reasons are:
1. HDD itself is damaged.
2. Network is down

Solution

1. Check Crystal's hardware log and if the HDD is damaged, please replace it.
2. Check network connection. If it is caused by network issues, please drag the volume back to ''Available Volume Group'' and then put it back to the original ''Volume Group''. Please note that after dragging back the Volume, it will proceed with database repair and it won't record during that period of time