EC2/EBS Storage I/O Diagnostic Troubleshooter (Part 1)
Use the interactive troubleshooter below to identify your EC2/EBS storage I/O symptom, review the raw evidence, understand the root cause, and apply the recommended fix.
🚨 Step 1: What specific error symptom are you experiencing?
Please click the most accurate description:
Quick Reference Table
| # | Scenario | Key Error Signal | Root Cause | The Fix |
|---|---|---|---|---|
| 1 | read-only — Filesystem remounted as read-only due to NVMe I/O timeout | "If I/O latency exceeds the value of this timeout parameter, the Linux NVMe driver fails the I/O and returns an error to the filesystem or application... In some cases, your filesystem might be remounted as read-only." | I/O latency exceeded the OS NVMe driver's default 30-second timeout threshold. | Set boot parameter nvme_core.io_timeout=4294967295. |
| 2 | EBS / impaired — Volume data potentially inconsistent, I/O disabled | "After I/O is disabled, the next volume status check fails, and the volume status is impaired... Awaiting Action: Enable IO... Volume data is potentially inconsistent." | Amazon EBS detected potentially inconsistent data and proactively disabled I/O to prevent data corruption. | Run aws ec2 enable-volume-io or enable the Auto-Enabled IO (autoEnableIO) attribute. |
| 3 | degraded — I/O performance status check: Degraded | "I/O performance status check... Degraded... For io1, io2, and gp3 volumes only. Volume performance is below expectations." | Actual volume performance dropped below expected levels, which frequently happens while initializing volumes restored from snapshots. | N/A (Usually resolves once volume initialization from snapshot completes). |
| 4 | stalled — I/O performance status check: Stalled | "I/O performance status check... Stalled... For io1, io2, and gp3 volumes only. Volume performance is severely impacted." | Volume performance was severely impacted, indicating the volume is struggling to process I/O due to infrastructure constraints or exhausted throughput limits. | N/A |