| 1 | ### Understand the alert |
| 2 | |
| 3 | This alert indicates that one or more physical disks attached to the MegaCLI controller are experiencing predictive failures. A predictive failure is a warning that a hard disk may fail in the near future, even if it's still working normally. The failure prediction relies on the self-monitoring and analysis technology (S.M.A.R.T.) built into the disk drive. |
| 4 | |
| 5 | ### Troubleshoot the alert |
| 6 | |
| 7 | **Make sure you have taken necessary backup steps before performing any action. Netdata is not liable for any loss or corruption of data, databases, or software.** |
| 8 | |
| 9 | 1. Identify the problematic drives: |
| 10 | |
| 11 | Use the following command to gather information about your virtual drives in all adapters: |
| 12 | |
| 13 | ``` |
| 14 | megacli –LDInfo -Lall -aALL |
| 15 | ``` |
| 16 | |
| 17 | 2. Determine the virtual drive and adapter reporting media errors. |
| 18 | |
| 19 | 3. Consult the MegaRAID SAS Software User Guide [1]: |
| 20 | |
| 21 | 1. Refer to Section 2.1.16 to check for issues with your drives. |
| 22 | 2. Refer to Section 7.18 to perform any appropriate actions on drives. Focus on Sections 7.18.2, 7.18.6, 7.18.7, 7.18.8, 7.18.11, and 7.18.14. |
| 23 | |
| 24 | 4. Consider replacing the problematic disk(s) to prevent imminent failures and potential data loss. |
| 25 | |
| 26 | ### Useful resources |
| 27 | |
| 28 | 1. [MegaRAID SAS Software User Guide (PDF download)](https://docs.broadcom.com/docs/12353236) |
| 29 | 2. [MegaCLI commands cheatsheet](https://www.broadcom.com/support/knowledgebase/1211161496959/megacli-commands) |