🔴 Critical   ⏱ 5–30 min  Last verified: 19 May 2026
Affected versions: FreeBSD 14

📖 ~1 min read

Table of contents
  1. Symptom & Impact
  2. Environment & Reproduction
  3. Root Cause Analysis
  4. Quick Triage
  5. Step-by-Step Diagnosis
  6. Solution – Primary Fix
  7. Solution – Alternative Approaches
  8. Verification & Acceptance Criteria
  9. Rollback Plan
  10. Prevention & Hardening
  11. Related Errors & Cross-Refs
  12. References & Further Reading

Symptom & Impact

Unexpected read-only imports usually indicate pool errors, hostid mismatch, or stale cache metadata.

Environment & Reproduction

Datasets mount read-only, writes fail with operation not permitted, and zpool status reports degraded or faulted states.

Root Cause Analysis

Applies to root-on-ZFS and data pools on FreeBSD 14 with automatic import at boot.

Quick Triage

Recent backups, maintenance window, and physical access if storage path changes are suspected.

Step-by-Step Diagnosis

[image_ref: 0] Run zpool status -xv; zpool import; zfs get readonly,mountpoint -r poolname; dmesg | grep -i zfs.

Illustrative mockup for freebsd-14 — terminal_or_shell
zpool status and zfs mount diagnostics in shell — Illustrative mockup — Progressive Robot

Solution – Primary Fix

[image_ref: 1] Verify zfs_enable=”YES” in /etc/rc.conf and validate /boot/zfs/zpool.cache generation.

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Illustrative mockup for freebsd-14 — log_or_config
Inspecting zpool cache and boot-time ZFS settings — Illustrative mockup — Progressive Robot

Solution – Alternative Approaches

Clear transient faults with zpool clear poolname, import with correct options, and regenerate cache by setting cachefile then exporting/importing safely. Replace failed devices if reported.

Verification & Acceptance Criteria

zpool status -x returns all pools are healthy and test writes to critical datasets succeed.

Rollback Plan

Re-import pool read-only for data extraction and restore from snapshots or backups if corruption indicators increase.

Prevention & Hardening

Schedule periodic zpool scrub and monitor SMART plus pool health alerts.

Escalate immediately when checksum errors keep increasing or multiple vdevs report unavailable.

Related tutorial: View the step-by-step tutorial for freebsd-14.

View all freebsd-14 tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

zpool(8), zfs(8), rc.conf(5), FreeBSD ZFS administration guidance.

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