This document describes how to view performance metrics forAsynchronous Replication.

To learn more about Asynchronous Replication, seeAbout Asynchronous Replication.

Metrics

You can view the following Asynchronous Replication metrics inCloud Monitoring:

Monitor sent byte counts

Use theAsync replication sent bytes count metric to graph the averagenumber of byte sent, sampled every minute. The number of sent bytes representsthe data your workload writes to block storage, which affects the speed ofreplication.

1. In the Google Cloud console, go to theCloud Monitoring > Metrics Explorer page.

   Go to the Metrics Explorer page

2. In theSelect a metric section, click theMetric menu.

3. SelectDisk (disk).

4. Select theDisk active metric category list, and then selectAsync replication sent bytes count(disk/async_replication/sent_bytes_count).

5. ClickApply.

6. In theTransform menu, select one of the following:

   • To view the total number of sent bytes, selectNone.
   • To view the number of bytes sent per second, selectRate.

7. In theFilters section, do the following:

   1. ClickAdd filter.
   2. Click inside theLabel box to view the list of available labels. Underthe headingResource labels, selectproject_id. Leave theComparison value set to= (equals). In theValue field, type orselect your project ID. ClickDone.
   3. ClickAdd filter.
   4. In theLabel box, selectdisk_id. Leave theComparisonvalue set to= (equals). In theValue field, type or select the IDof the primary disk that is replicating.
   5. ClickDone.

8. ClickMore options.

9. In theAlignment function menu select an alignment function. TheMean alignment function shows the average number of bytes sent per minute,while theMax alignment function shows the highest number of bytes sentper minute.

10. In theMin alignment period menu, select an alignmentperiod. The alignment period must be at least one minute.

Monitor RPO

Use theAsync replication time since last replication metric to graph thenumber of seconds since the last replication was done (RPO).

1. In the Google Cloud console, go to theCloud Monitoring > Metrics Explorer page.

   Go to the Metrics Explorer page

2. On theMetrics Explorer page, clickAdd query.

3. In theSelect a metric section, click theMetric menu.

4. SelectDisk (disk).

5. Select theDisk active metric category list, and then selectAsync replication time since last replication(disk/async_replication/time_since_last_replication).

6. ClickApply.

7. In theFilters section, add filters for your project ID and disk ID:

   1. ClickAdd filter.
   2. Click inside theLabel box to view the list of available labels. Underthe headingResource labels, selectproject_id. Leave theComparison value set to= (equals). In theValue field, type orselect your project ID. ClickDone.
   3. ClickAdd filter.
   4. In theLabel box, selectdisk_id. Leave theComparisonvalue set to= (equals). In theValue field, type or select the IDof the primary disk that is replicating.
   5. ClickDone.

8. ClickMore options.

9. In theAlignment function menu, select an alignment function. TheMean alignment function shows the average number of seconds since the lastreplication was done , while theMax alignment function shows the highestnumber of seconds since the last replication was done .

10. In theMin alignment period menu, select the select an alignmentperiod. The alignment period must be at least one minute.

11. Optional: Save the chart.

What's next

• Learn how to customize Asynchronous Replication chats withMetrics Explorer.
• Learn more aboutAsynchronous Replication.