You've got a drive bay sitting empty in your SR250 and the array's waiting on that fourth member to rebuild. This is the internal x4 SAS/SATA cable that runs from the HW X30 backplane to the 3.5" or 2.5" hot-swap caddy. Slot it in, seat the drive, and the RAID controller sees it straight away
| brand | LENOVO ISG |
| compatible_system | ThinkSystem SR250 |
| bay_size | 3.5" / 2.5" |
| interface | HS SAS/SATA x4 |
| adapter | HW X30 RAID/HBA |
| category | SERVERS |
| subcategory | LENOVO CABLE KITS |
