Qumulo Drive Failure Protection

IN THIS ARTICLE

Outlines 2 and 3 drive failure protection in Qumulo Core

REQUIREMENTS

Cluster running Qumulo Core

NOTE: Qumulo's 3 drive failure protection is available in Qumulo Core version 2.7.10 and above at cluster creation. Reference the article Create a Qumulo Cluster with 2.7.10 and above for additional details.

2 DRIVE FAILURE PROTECTION

System State	Severity	Color	UI Messsage	Protection State
Nodes & Drives are fully operational	None	Green	Cluster is balanced and protected for up to 2 drive failures	Data is Protected and Balanced
1 drive failure Data is reprotecting	Medium	Yellow	A drive has failed. The cluster can sustain [x] additional drive failure[s], but you should replace the failed drive.	Data is Reprotecting You may replace a failed drive at any time. The cluster will complete reprotection and rebalance.
1 drive failure Data is protected	Medium	Yellow	A drive has failed. The cluster can sustain [x] additional drive failure[s], but you should replace the failed drive.	Data is Protected and Balanced
2 drive failure Data is reprotecting	High	Red	2 drives have failed. This is the maximum your cluster can tolerate without data loss. You should replace the failed drives ASAP.	Data is Reprotecting You may replace a failed drive at any time. The cluster will complete reprotection and rebalance.
2 drive failure Data is protected	Medium	Yellow	2 drives have failed. This is the maximum your cluster can tolerate without data loss. You should replace the failed drives ASAP.	Data is Protected and Balanced
2+ drive failures	High	Red	[x] drives have failed. This is the maximum your cluster can tolerate without data loss. You should replace the failed drives ASAP.	Data is available, but we are unable to run reprotect
1 node offline	Medium	Red	Any additional failures could result in data loss. All nodes must be online before data can be reprotected.	Data is Protected
• 1 drive failure & 1 node offline • 2+ nodes offline • 2+ drive failure & any node offline	Very High	Red	We are unable to communicate with your cluster at this time. For assistance, please contact us.	Emergency situation

3 DRIVE FAILURE PROTECTION

System State	Severity	Color	UI Messsage	Protection State
Nodes & Drives are fully operational	None	Green	Cluster is balanced and protected for up to 3 drive failures	Data is Protected and Balanced
1 drive failure Data is reprotecting	Medium	Yellow	A drive has failed. The cluster can sustain [x] additional drive failure[s], but you should replace the failed drive.	Data is Reprotecting You may replace a failed drive at any time. The cluster will complete reprotection and rebalance.
1 drive failure Data is protected	Medium	Yellow	A drive has failed. The cluster can sustain [x] additional drive failure[s], but you should replace the failed drive.	Data is Protected and Balanced
2 drive failure Data is reprotecting	Medium	Yellow	2 drives have failed. The cluster can sustain [x] additional drive failure[s] but you should replace the failed drives.	Data is Reprotecting You may replace a failed drive at any time. The cluster will complete reprotection and rebalance.
2 drive failure Data is protected	Medium	Yellow	2 drives have failed. The cluster can sustain [x] additional drive failure[s] but you should replace the failed drives.	Data is Protected and Balanced
3 drive failure Data is reprotecting	High	Red	3 drives have failed. This is the maximum your cluster can tolerate without data loss. You should replace the failed drives ASAP.	Data is Reprotecting You may replace a failed drive at any time. The cluster will complete reprotection and rebalance.
3 drive failure Data is protected	Medium	Yellow	3 drives have failed. The cluster can sustain [x] additional drive failure[s] but you should replace the failed drives ASAP.	Data is Protected and Balanced
3+ drive failure Data is reprotecting	High	Red	[x] drives have failed. This is the maximum your cluster can tolerate without data loss. You should replace the failed drives ASAP.	Data is available, but we are unable to run reprotect
1 node offline	Medium	Red	Data is protected from 1 additional drive failure or 0 node failures.	Data is Protected
1 drive failure and 1 node offline	High	Red	Any additional failures could result in data loss. All nodes must be online before data can be reprotected.	Data is Protected Data is available but reprotection is unavailable until the node is brought back online.
• 2+ nodes offline • 2+ drive failure & any node offline	Very High	Red	We are unable to communicate with your cluster at this time. See our guide to identifying and resolving common issues. For assistance, please contact us.	Emergency situation