🔴 Critical   ⏱ 5–30 min  Last verified: 20 May 2026
Affected versions: RHEL 10.0 RHEL 10.1

📖 ~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

IO latency spikes and application stalls occur due to unstable storage paths.

Environment & Reproduction

Typically appears on SAN-attached hosts with misaligned path checker settings.

multipath -ll
systemctl status multipathd

Root Cause Analysis

Path checker timing and controller failover policies are inconsistent with array behavior.

Quick Triage

Review path states and kernel storage errors.

multipathd show paths
journalctl -k -n 120

Step-by-Step Diagnosis

Correlate flaps with HBA and transport layer events.

journalctl -u multipathd -n 200
cat /etc/multipath.conf
Illustrative mockup for rhel-10 — multipath_diag
Path up-down events in multipathd — Illustrative mockup — Progressive Robot

Solution – Primary Fix

Apply vendor-recommended multipath profile and reload daemon.

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sudo mpathconf --enable --with_multipathd y
sudo systemctl restart multipathd
sudo multipath -r
Illustrative mockup for rhel-10 — multipath_fix
Stabilized multipath policy and HBA tuning — Illustrative mockup — Progressive Robot

Solution – Alternative Approaches

Update HBA firmware and SAN zoning when software tuning alone is insufficient.

Verification & Acceptance Criteria

Paths remain stable and latency returns to baseline.

multipathd show paths
iostat -x 2 5

Rollback Plan

Restore previous multipath.conf and restart multipathd if new profile regresses behavior.

Prevention & Hardening

Validate multipath policy after SAN maintenance and firmware changes.

Related to SCSI device timeouts, transport resets, and queue_if_no_path events.

Related tutorial: View the step-by-step tutorial for rhel-10.

View all rhel-10 tutorials on the Tutorials Hub →

Browse all common problems & solutions on the Tutorials Hub.

References & Further Reading

RHEL DM-Multipath administration and SAN vendor interoperability notes.

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