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What happens if a network cable is pulled out of one of the DMA network cards?

Different scenarios are possible:

If the network cable connecting to the switch or router is pulled out of the online DMA

  • The offline DMA will detect a failing heartbeat path toward the online DMA, and will go online after a number of heartbeat failures.

  • In the Alarm Console, a notice will appear indicating a failing heartbeat path.

  • The Status dialog box will indicate that the DMA is unreachable, and that the heartbeat to the DMA is failing.

  • The DMA will go offline because of the failing heartbeat, and because the other DMA, which has now taken over, will have sent a notification over the sync connection.

  • Both DataMiner sync and database sync will go on as the sync connection is still available.

  • Once the cable is reconnected, the other DMA will stay online.

Tip

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If the network cable used for synchronization is pulled out of the online DMA

  • In the Alarm Console, notices will appear, indicating that:

    • an NIC has been unplugged,

    • the sync connection is failing,

    • DB forwarding is failing.

  • In the Status dialog box, you will see the same errors:

    • Sync Connection will get the status Not Available.

    • DB Sync will get the status Failing.

    • The NIC in question will get the status Unavailable.

  • Once the cable is reconnected, synchronization will again be OK.

Tip

See also: Viewing Failover information

If both network cables are pulled out of the online DMA

  • The offline DMA will detect that the DMA is unreachable, and will go online.

  • The DMA of which the cables have been pulled out will detect that the ping to the switch or router is failing, and will go offline.

  • In the Alarm Console of the other DMA, which is now online, notices will appear, indicating that both the sync connection and the database data forwarding are failing.

  • In the Status dialog box:

    • The Agent status will be Unreachable.

    • The Heartbeat will get the status Failing.

    • Sync Connection will get the status Not Available.

    • DB Sync will get the status Failing.

  • Once the cables are reconnected, synchronization will again be OK, and the other DMA will stay online.

Tip

See also:

If the network cable connecting to the switch or router is pulled out of the offline DMA

  • The online DMA remains online.

  • In the Alarm Console, a notice will appear, indicating that the heartbeat path is failing.

  • In the Status dialog box, the status of the Heartbeat will be Failing, and the Agent status for the offline Agent will be Unreachable.

  • Both DataMiner sync and database sync will go on as the sync connection is still available.

Tip

See also:

If the network cable used for synchronization is pulled out of the offline DMA

  • The online DMA remains online.

  • In the Alarm Console, there will be a timeout alarm due to the lost connection, and notices will appear, indicating that:

    • an NIC has been unplugged,

    • the sync connection is failing,

    • DB forwarding is failing.

  • In the Status dialog box, you will see the same errors:

    • Sync Connection will get the status Not Available.

    • DB Sync will get the status Failing.

    • The NIC in question will get the status Unavailable.

  • Once the cable is reconnected, synchronization will again be OK.

Tip

See also: Viewing Failover information

If both network cables are pulled out of the offline DMA

  • The online DMA remains online.

  • In the Alarm Console, notices will appear, indicating that heartbeat paths and sync connection are failing.

  • In the Status dialog box:

    • The Agent status will be Unreachable.

    • The Heartbeat will get the status Failing.

    • Sync Connection will get the status Not Available.

    • DB Sync will get the status Failing.

  • Once the cables are reconnected, synchronization will again be OK.

Tip

See also:

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