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Release notes

This page contains a list of features, changes, known issues and known limitations of the Nerve releases.

Version 2.8.1

This version was released on June 6, 2024. Unless otherwise stated, all known issues and limitations of the previous version are still valid.


Component Features
Base system Added an installer image including the KVM hypervisor. Deprecated XEN hypervisor images.

Moved the CODESYS runtime into the host.

Notes about installation images and updating through the Management System
There are two installation image variants in 2.8.1:
  • without a hypervisor (base image)
    This variant contains the CODESYS runtime but cannot run VM workloads. 2.8.0 nodes running the base image can be updated to this variant.
  • with the KVM hypervisor
    This variant does not contain the CODESYS runtime but it can run VM workloads. If 2.8.1 with KVM hypervisor is desired on a node, then the image needs to be freshly installed, as it is not possible to update from the 2.8.0 base variant.
So depending on the installation type, there is either a CODESYS runtime available or VM workloads can be deployed but not both. Further notes on updating to 2.8.1 through the Management System:
  • Updating 2.7.0 nodes running on XEN hypervisors to any 2.8.1 variant is not possible.
  • The 2.8.1 image variant including CODESYS only runs on the MFN 200 and the Siemens Simatic BX-39A.
Nerve Devices Qualified two new devices to run with Nerve with the CODESYS runtime:
  • MFN 200 (first party)
  • Siemens Simatic BX-39A
The KVM image for using user VMs runs without restrictions.

Bug fixes

  • Fixed an issue where an error 500 was caused when migrating CODESYS workloads from an older Management System to a newer one.
  • Fixed an issue where reuploading a previously erroneous DNA configuration file would produce an unhelpful system notification.
  • Fixed an issue where it was possible to control workloads while the cancellation of a DNA configuration was in progress.
  • Fixed an issue for offline license activation where the system would redirect to the Local UI, even though a wrong license was used. This would leave the user unable to re-apply a license or log in to the Local UI.
  • Fixed an issue where the information in the node details view would be incorrect if the node had gone offline right before.
  • Fixed an issue where assigning a role to a user that only contained Nerve DNA permissions would cause the user to see the Logs tab in the node details view instead of the DNA tab.
  • Fixed an issue where the Management System would display the wrong WAN IP address for a node.
  • Fixed an issue where applying configuration files to a Docker workload through the Local UI would not work even though the system reported a successful application.
  • Fixed an issue where the process of uploading a larger VM workload image would be aborted with an unhelpful error message.

Known issues and limitations

  • On rare occasions after a reboot of the Management System, some nodes may need up to one hour to come back online. No further action is needed.
  • Capabilities might be missing from the node capabilities list in the Local UI after a reboot. Refreshing the page solves the issue.
  • On KVM hypervisor installations, the CPU usage values for Docker workloads are incorrect. Due to the hypervisor change, the algorithm needs to be corrected.
  • The UI for applying configuration files sometimes does not update after adding a ZIP file, leaving the Apply button grayed out. Trying to add the ZIP file again might solve the issue.
  • There are inconsistencies in the naming of workload statuses. The terms "Pause" and "Suspend" are used interchangeably.

Compatibility matrix

Refer to the table below for information on the compatibility between different components of the Nerve system with the current version of the Management System.

Management System version Node version MS/node compatibility Nerve Connection Manager (v1.0.13) Nerve Connection Manager (v2.0.0) Incremental node update Full support
2.8.1 2.2.0
2.8.1 2.2.1
2.8.1 2.3.0
2.8.1 2.3.1
2.8.1 2.4.1
2.8.1 2.5.0
2.8.1 2.6.1
2.8.1 2.7.0
2.8.1 2.8.0
2.8.1 2.8.1

For more information on technical limitations (), and requesting assistance with setting up older versions in the current version (), contact a sales representative or write an issue through the TTTech Industrial support portal.

Scaling and performance limitations

This release has been tested to perform within the following scaling boundaries:

Maximum number of concurrent devices 200 
Maximum number of concurrently logged in users
Maximum workload size 50 GB 
Maximum number of concurrent remote access sessions
Maximum number of workloads in workload repository 200
Maximum data upload per node 5 datagrams per second with at least 10 sensor values for 200 nodes in parallel.