Robust Network Layer

Table of Contents

Overview

The CommServe coordinates all the activities within the CommCell. This includes starting and managing backup jobs, receiving updates from them and also recording their final as well as intermediate job status conditions. Each backup job consists of several phases, each of which is initiated and managed by the CommServe computer. The CommServe also checks for the liveliness and continued operation of each of the phases.

The actual data in the CommCell flows from the Client computer to the MediaAgent. Often, these two computers are located at the same site connected by a Local Area Network (LAN); however, their connectivity to the CommServe is using a Wide Area Network (WAN) or Virtual Private Network (VPN), which are more prone to glitches and temporary outages.

When a backup activity is in progress, there is a significant time and resource investment in transferring and saving the data to the target media. If this backup operation were disrupted due to a WAN glitch, the investment would be at risk. Some of the database backups (e.g., Exchange, Oracle) need to be restarted from the beginning, which can be costly in addition to time consuming.

The purpose of Robust Network Layer is to protect this investment of time and resources when these network glitches occur. It allows the connections between a CommServe, MediaAgent, and client to be retried at set intervals, if there is any loss of connectivity.

Robust Network Layer is supported by Windows/UNIX clients and MediaAgents.

Changing Robust Network Layer Configuration

During the data transfer phase of a backup operation, which runs on a MediaAgent and client, the Job Manager will periodically need to communicate directives to the CommServe. If during this time, a loss of network connectivity is detected, the Robust Network Layer enables the Job Manager to keep the job in a Running (Cannot be verified) job state, visible in the Job Controller, for up to 20 minutes while continuously checking for network connectivity at set intervals, e.g., every 30 seconds.

The default amount of time the system will hold a job in a running state when there is loss of connectivity is up to 20 minutes.

You can modify the Robust Network Layer configuration as follows:

  1. From the CommCell Console, right click a client and select Properties. Click the Advanced tab.

    Alternatively, right click a MediaAgent and select Properties. Click the Control tab.

  2. Select the Enable retry on network errors checkbox to enable the feature.
    • In Retry Frequency (seconds) select or type the time interval at which the Job Manager will check for network connectivity. The default value is set at 30 seconds.
    • In Retry Count select or type the number of times the Job Manager will check for network connectivity. The default value is set at 40.

    Clear the checkbox to disable the feature.

  3. Click OK.

Enabling or Disabling Robust Network Layer

During an installation of a CommServe, a Client or a MediaAgent, the Robust Network Layer is automatically enabled by default.

Use the following steps to disable (or re-enable) Robust Network Layer:

  1. From the CommCell Console, right click a client and select Properties. Click the Advanced tab.

    Alternatively, right click a MediaAgent and select Properties. Click the Control tab.

  2. Select the Enable retry on network errors checkbox to enable the feature. Clear the checkbox to disable the feature.
  3. Click OK.