Paths Showing as Non-Live While Using NVMe-TCP on RHEL/Rocky/AlmaLinux

NVMe-TCP on RHEL/Rocky/AlmaLinux

• nvme list-subsys shows non-live paths
• Reduced path count
• Performance degradation

1. Network interface down
2. Connection lost
3. Discovery refresh required

Diagnosis:

# Check path status
nvme list-subsys

# Check for errors
dmesg | grep -i "nvme.*error\|nvme.*fail"

# Check network interface
ip link show <interface>
ethtool <interface>

Solutions:

1. Network interface down:

   ip link set <interface> up

2. Connection lost:

   # NVMe-TCP: Reconnect
   nvme disconnect -n <subsystem_nqn>
   nvme connect -t tcp -a <portal_ip> -s 4420 -n <subsystem_nqn>
      
   # iSCSI: Restart session
   iscsiadm -m node -T <target_iqn> -p <portal_ip> --logout
   iscsiadm -m node -T <target_iqn> -p <portal_ip> --login

3. Discovery refresh:
   

   # Re-run discovery
   nvme discover -t tcp -a <discovery_ip> -s 8009