Important! Additional drive failures may be considered safe within the following scenarios depending on your cluster configuration and which drives have failed. Refer to the Qumulo Core Web UI for more details to confirm the most accurate state of your system.
IN THIS ARTICLE
Outlines 2, 3, and 4 drive failure protection in Qumulo Core
REQUIREMENTS
- Cluster with 4 or more nodes running Qumulo Core for 2 Drive Failure Protection
- Cluster with 5 or more nodes running Qumulo Core 2.7.10 and above for 3 Drive Failure Protection
- Cluster with 50 or more nodes running Qumulo Core 2.13.4 and above for 4 drive Failure Protection.
NOTE: The recommended 2 or 3 drive protection level will be selected by default based on the cluster size and node type at cluster creation while 4 drive failure protection requires the QQ CLI to configure. For more information, reference the Create a Qumulo Cluster with 2.7.10 and above article.
2 DRIVE FAILURE PROTECTION
| Protection State | Severity | Failure Scenarios |
| Data is Protected and Balanced | None |
Nodes & Drives are fully operational |
|
Data is Protected and Balanced You may replace a failed drive at any time. |
Medium |
1 drive failure 2 drive failures |
|
Data is Reprotecting |
Medium |
1 drive failure 2 drive failures |
|
Data is Protected |
Medium |
1 node offline |
| Data is available, but we are unable to run reprotect | High |
2 or more drive failures |
| Emergency situation | Very High |
1 drive failure & 1 node offline 2 or more nodes offline 2 or more drive failures & any node offline |
3 DRIVE FAILURE PROTECTION
| Protection State | Severity | Failure Scenarios |
| Data is Protected and Balanced | None |
Nodes & Drives are fully operational |
|
Data is Protected and Balanced You may replace a failed drive at any time. |
Medium |
1 drive failure 2 drive failures 3 drive failures |
|
Data is Reprotecting
|
Medium |
1 drive failure 2 drive failures 3 drive failures |
|
Data is Protected |
Medium |
1 node offline |
|
Data is Reprotecting |
High |
3 drive failures |
|
Data is Protected |
High |
1 drive failure and 1 node offline |
|
Emergency situation |
Very High |
2 or more nodes offline 2 or more drive failures & any node offline |
4 DRIVE FAILURE PROTECTION
| Protection State | Severity | Failure Scenarios |
| Data is Protected and Balanced | None |
Nodes & Drives are fully operational |
|
Data is Protected and Balanced You may replace a failed drive at any time. |
Medium |
1 drive failure 2 drive failures 3 drive failures 4 drive failures |
|
Data is Reprotecting
|
Medium |
1 drive failure 2 drive failures 3 drive failures |
|
Data is Protected |
Medium |
1 node offline |
|
Data is Reprotecting |
High |
4 drive failures |
|
Data is Protected |
High |
1 drive failure and 1 node offline |
|
Emergency situation |
Very High |
2 or more nodes offline 2 or more drive failures & any node offline |
RESOLUTION
You should now have an overall understanding of 2, 3, and 4 drive failure protection in Qumulo Core
ADDITIONAL RESOURCES
Create a Qumulo Cluster with 2.7.10 and above
Qumulo Care Proactive Monitoring
Video: HDD Field Replacement Unit
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