Viewing the Cloud Extension Status
To monitor the current run state of the Cloud Extension, review the Velostrata Cloud Extension portlet added to the virtual Datacenter Summary page.
A cloud extension state can be “Creating”, “Starting” “Stopping” “Deleting” “Active”, or “Impaired”.
For information on Velostrata High Availability, see High Availability Overview.
Remediation Tip: If a Cloud Extension appears impaired due to a cloud host health issue, stopping and starting the Cloud Extension may re-mediate the issue as affected instances are restarted on a healthy host.
An impaired Cloud Extension can be caused due to components that were not successfully deployed failures during system operation. These are presented in the list of health checks that did not pass. After fixing the underlying causes, the Cloud Extension can be repaired. Repairing the cloud extension attempts to re-create the missing components and/or run relevant health checks. See Repairing the Cloud Extension. Once the Cloud Extension is repaired, the status is set to Active.
The following health checks are performed every 1 minute to report on Cloud Extension status:
- Cache Store Accessibillity
- Velostrata Storage Grid Service Status
- Velostrata Cloud Edge Service
- SCSI Target
- Cloud Edge Local Storage
- Cloud Edge Functionality
- Exporter Service
- Exporter Functionality
- On-Premises Edge Service
- SQS Service (if the AWS region supports the SQS Service)
Enhanced Degraded Mode
Velostrata 3.0+ supports an Enhanced Degraded Mode using the AWS SQS service. This delivers improved performance and is currently applicable in the following AWS regions:
- US East (N. Virginia)
- US East (Ohio)
- US West (Oregon)
- EU (Ireland)
Additional AWS regions will automatically be added as soon as the SQS service is available. This Enhanced Degraded Mode is only applicable to VMs moved to the cloud in version 3.0.
Note: The new Enhanced Degraded Mode does not apply if the SQS service is unavailable in the region, or if the VM that went into Degraded Mode was upgraded from an older version. This impacts performance but does not impact on the service.
An SQS health check is run on the regions that support the SQS service. The health check will fail only in supported regions when there is an on-going disruption. Moreover, the health-check impact is marked as “Medium”, meaning the CE will not become Impaired due to the failure.
To view basic Cloud Extension status from the web:
1. Login to your Velostrata web management appliance via HTTPS://IP_OF_VELO_MGMT.
2. Click the Target Cloud icon.
3. A list of Cloud Extensions appear with their state listed on the far right.
4. You can perform limited operations on a Cloud Extension by selecting one and using the buttons at the top to start, stop, delete, or repair.
To view advanced Cloud Extension status from vCenter:
- To view the Cloud Extension status, view the Datacenter > Summary tab.
- Click the information icon. If a Cloud Extension status is Impaired, the component statuses are listed as well as when the Cloud Extension was last Active.
- When the Cloud Extension status becomes Impaired, an alarm is triggered.
- To view more details on an alarm, select the alarm.
- To acknowledge the alarm, click Acknowledge.
- To view the related events, select Monitor > Events. In this example, the Cloud Extension is degraded as Cloud Edge node A has failed. The VM is moved to Cloud Edge node B and the following events appear during failover.
- Once Cloud Edge node A is active, failback occurs and the VM is moved back to Cloud Edge node A and the following events appear.