SUSE Support

Here When You Need Us

ALUA port group messages

This document (7023021) is provided subject to the disclaimer at the end of this document.


SUSE Linux Enterprise Server 12 Service Pack 2 (SLES 12 SP2)
SUSE Linux Enterprise Server 12 Service Pack 3 (SLES 12 SP3)


The following message are seen in the system log:
alua: port group 00 state A non-preferred supports tolUsNA
alua: port group 01 state N non-preferred supports tolUsNA


The messages are informational only, they do not indicate any problem with the environment.


If the storage supports ALUA (Asymmetric Logical Unit Access), the messages show the detected port groups and their supported ALUA states.

Additional Information

Taking the following example:
alua: port group 00 state A non-preferred supports tolUsNA
alua: port group 01 state N non-preferred supports tolUsNA
Each letter in 'tolUsNA' represents an Asymmetrical Access State for a target port group being serviced by a LUN in a SCSI Multipath configuration:

Transitioning/Offline/LBA/Unavail/Standby/Non-Opt active/Active.

When a target port group is initialized and configured, that configuration dictates which of these possible Asymmetrical Access States the target port group can report with. 

The states that are logged in capital letters are the Asymmetrical Access States which the currently reporting target port group is capable of undergoing for the given LUN.

To breakdown the logged information above:

'alua: port group 00'

This section of the message identifies which target port group is reporting, in this case, port group 00.

'state A preferred'

The current state of Asymmetrical Access that a target port group is in, out of the capable states it has reported to the output message. In this case, port group 00 is in the Active-Optimized state.

'supports tolUsNA'

The provided set of supported Asymmetrical Access States by the reporting target port group. In this case, Unavailable, Non-Optimized Active and Active-Optimized are supported states by the Multipath configuration for target port group 00.


This Support Knowledgebase provides a valuable tool for SUSE customers and parties interested in our products and solutions to acquire information, ideas and learn from one another. Materials are provided for informational, personal or non-commercial use within your organization and are presented "AS IS" WITHOUT WARRANTY OF ANY KIND.

  • Document ID:7023021
  • Creation Date: 29-May-2018
  • Modified Date:14-Oct-2021
    • SUSE Linux Enterprise Server

< Back to Support Search

For questions or concerns with the SUSE Knowledgebase please contact: tidfeedback[at]

SUSE Support Forums

Get your questions answered by experienced Sys Ops or interact with other SUSE community experts.

Support Resources

Learn how to get the most from the technical support you receive with your SUSE Subscription, Premium Support, Academic Program, or Partner Program.

Open an Incident

Open an incident with SUSE Technical Support, manage your subscriptions, download patches, or manage user access.