Intermittent Disconnections when Using iSCSI on RHEL/Rocky/AlmaLinux
KB0023063
Environment
iSCSI on RHEL/Rocky/AlmaLinux
Symptoms
- Sessions drop and reconnect
- I/O errors in logs
- Performance degradation
Cause
- Network issues
- Overloaded network
- Timeout settings too aggressive
Resolution
Diagnostic Steps:
# Monitor connection state
watch -n 1 'iscsiadm -m session'
# Check session statistics
iscsiadm -m session -P 3
# Check system logs
journalctl -f | grep -i "iscsi\|multipath"
# Monitor packet drops
ip -s link show | grep -A 5 "ens1f"- Network issues:
- Cable problems
- Switch port errors
- MTU mismatch
- Overloaded network:
- Check for bandwidth saturation
- Verify QoS settings
- Timeout settings too aggressive:
- Increase timeout values
- Check replacement_timeout (default: 120s)