Data replication status - Application Migration Service

Data replication status

The Data replication status section provides an overview of the overall source server status, including:

  • Replication progress – The percentage of the server's storage that was successfully replicated.

  • Rescan progress – The percentage of the server's storage that was rescanned (in the event of a rescan)

  • Total replicated storage – The total amount of storage replicated (in GiB).

  • Lag – Whether the server is experiencing any lag. If it is - the lag time is indicated.

  • Backlog – Whether there is any backlog on the server (in MiB)

  • Elapsed replication time – Time elapsed since replication first began on the server.

  • Last seen – The last time the server successfully connected to AWS Application Migration Service.

  • Replication start time – The date and time replication first began on the server.

Data replication can be in one of several states, as indicated in the panel title:

  • Initial sync: initial copying of data from external servers is not done. Progress bar and Total replicated storage fields will indicate how far along the process is.

  • Healthy: all data has been copied and any changes at source are continuously being replicated (data is flowing).

  • Rescan: an event happened that forced the agent on the external server to rescan all blocks on all replicated disks (same as initial sync but faster because only changed blocks need to be copied; a rescan progress bar will also appear).

  • Stalled: data is not flowing and user intervention is required (either initial sync will never complete, or state at source will become further and further the state at AWS). When the state is stalled, then the replication initiation checklist is also shown, indicating where the error occurred that caused the stalled state.

This panel also shows:

  • Total replicated storage: size of all disks being replicated for this source server, and how much has been copied to AWS (once initial sync is complete)

  • Lag: if you launch a recovery instance now, how far behind will it be from state at source. Normally this should be none.

  • Backlog: how much data has been written at source but has not yet been copied to AWS. Normally this should be none.

  • Last seen: when is the last time the AWS Replication Agent communicated with the AWS DRS service or the replication server.

If everything is working as it should and replication has finished initializing, the Data replication progress section will show a Healthy status.

If there are initialization, replication, or connectivity errors, the Data replication status section will show the cause of the issue (for example, a stall).

If the error occurred during the initialization process, then the exact step during which the error occurred will be marked with a red "x" under Replication initiation steps.