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Altair Accelerator Administrator Guide
Configure and manage the use of Accelerator after it is installed.
Upgrade Accelerator
This section provides instructions to change the software version on which Accelerator runs.
Run Multiple Versions of Altair Accelerator
Accelerator can be run using a different software version than the software version used by the other Altair Accelerator projects.

Welcome
What's New
View new features for Accelerator 2025.1.0.
Accelerator Overview
Discover the available Altair Accelerator guides.
Accelerator Tutorials
Discover Accelerator functionality with interactive tutorials.
Altair Accelerator User Guide
Basic tasks in Accelerator, including submitting jobs, tracking job information, and analyzing and solving common problems.
Altair Accelerator Administrator Guide
Configure and manage the use of Accelerator after it is installed.
- Use Accelerator Help
  Accelerator documentation is available in HTML and PDF format.
- Accelerator Quick Start
  Accelerator has two main commands, nc and ncmgr.
- Command Line Interface
- Quick Reference
- Accelerator Server and System Customization
- Start and Stop Accelerator
- Job Management
- Log Files
- Database
  Accelerator stores historical information about jobs in a relational database. As of version 2015.09, the database is fully integrated and managed as part of Accelerator. This section provides an overview of the components that run and manage the database.
- FairShare
- Jobclasses
- Preemption
  Preemption is the process of reserving or revoking resources from other jobs in order to help "important jobs" finish quickly.
- Resource Management
  Altair Accelerator includes a subsystem for managing computing resources. This allows the design team to factor in various constraints regarding hardware and software resources, as well as site policy constraints.
- Resource Management with RDS
  This is a usage guide for the Resource Data Service (RDS), an alternative service for managing License resources and License-first scheduling in Accelerator.
- Configure Container Integration
- Streaming Data Service
  The Streaming Data Service (SDS) publishes a time series data stream that can be consumed by existing Kafka systems and compatible reporting tools to monitor VOV projects.
- Environment Management
  To ensure the correct and repeatable behavior of the tools, the environment must be controlled. This chapter explains how VOV supports multiple reusable environments.
- Directories and Files
- Alerts and Notifications
- System Tasks
- Upgrade Accelerator
  This section provides instructions to change the software version on which Accelerator runs.
  - Cold Upgrade
    This method is usually implemented with a physical overhaul, a part of a major IT event. This kills all running jobs, which can be highly disruptive.
  - Hot Upgrade
    This method reduces upgrade impact -- less downtime for productivity, less obtrusive for the users. The vovserver and vovtaskers are moved separately to the new version.
  - Rolling Hot Upgrade
    In this method, a new queue is brought up with the new version of the software; the previously existing queue remains fully functional.
  - Stop Accelerator Job Acceptance
  - Suspend Accelerator Job Dispatch
  - Run Multiple Versions of Altair Accelerator
    Accelerator can be run using a different software version than the software version used by the other Altair Accelerator projects.
- Storage Aware Scheduling
  This daemon vovfilerd replaces older daemons like vovisilond, vovnetappd and vovregulatord. Also the utility vovfiler_setup is no longer needed. The visualization of the filer information is now done either via the vovfilerd.cgi page or via the utility vovfilerdgui.
- Frequently Asked Questions and Troubleshooting Tips
- Backwards Compatibility and Migrating from Previous Versions
  This chapter provides information about deprecated features that are still supported. This information is provided should you see older commands in use after a software upgrade or migrating to a newer Accelerator.

Run Multiple Versions of Altair Accelerator

Accelerator can be run using a different software version than the software version used by the other Altair Accelerator projects.

Allocator

Specify the version used by a queue using the -version option. For more information, refer to the Altair Allocator user documentation.

Indirect Taskers

For indirect taskers to work with a Accelerator server that uses a different version, set the environment variable VNC_NEWVERSION to the full path of the root of the installation used by Accelerator.

For example, if the Accelerator server is using the software installed in /tools/RTDA/2019.01/macosx/bin/vovserver, do the following:

setenv VNC_NEWVERSION /tools/RTDA/2019.01