Slower disk performance in one block storage cluster
Resolved- Affected
- Block storage
- Impact
- Degraded performance
- Duration
- 35 min · 12 September 2026
Resolved
Performance has been normal for 10 minutes. The cause was a failing disk controller in one storage node, which slowed down data rebalancing. The controller has been replaced. No data was lost.
Monitoring
The affected storage node has been taken out of service and latency is returning to normal. We are monitoring the cluster.
Identified
We have found a faulty disk controller in one storage node and are moving traffic away from it.
Investigating
We are investigating higher disk latency for some virtual machines that use block storage.