How to troubleshoot Zmanda Sentinel connectivity issues

Customers that use Zmanda Cloud Storage (ZCS) for storage may experience problems with Sentinel connectivity. In this KB article, we will explore the causes of these issues and provide solutions to help you resolve them.

This article is valid for Zmanda version 5.1.


When connectivity issues arise, Zmanda Management Console (ZMC) will generate the following error message:

“File Share backup reserved capacity has been exhausted and connection to Zmanda Sentinel is unavailable, Backups for Backup-set with File share type sources will stop working after ‘x’ days” error message displayed in the ZMC-UI."


The issue of Zmanda Sentinel connection being unavailable and the File Share backup capacity running out might have a number of root causes:

  1. Storage Capacity Exceeded: When the storage space allotted for backups of File Shares is exceeded, it may result in backup failures and a disruption in the Zmanda Sentinel connection.

  2. Network Issues: The connection to Zmanda Sentinel may be disrupted by problems with the network, such as high latency, network congestion, or occasional connectivity issues.

  3. Configuration Errors: Misconfigurations in ZMC or improper settings related to backup schedules, storage allocation, or network configurations can trigger the mentioned issues.

  4. Security Restrictions: Security controls or restrictions placed on the ZCS or on the network infrastructure may make it difficult for File Share backups and connectivity to Zmanda Sentinel to function as intended.

Addressing these underlying causes promptly is crucial to ensure uninterrupted functionality of File Share backups and a stable connection to Zmanda Sentinel.


It is essential to address this issue promptly since backups for Backup-sets using File Share type sources will stop functioning after a certain number of days denoted by 'x'.

The steps below can be used to fix the depletion of the File Share backup reserved capacity as well as the inability to connect to Zmanda Sentinel:

  1. Check URL Accessibility: Verify if the URL is accessible. Execute the following command on the server hosting Zmanda: ping -c 5 Vault 

  2. Analyze Command Output: Check the second-last line of the command output. If it reads 5 packets transmitted, 5 received, 0% packet loss, time 4004ms, then Sentinel is reachable. If not, proceed to the next step.

  3. Contact Zmanda Support or IT Team: If the Sentinel is not reachable, promptly reach out to the Zmanda support team at for further assistance. Alternatively, contact your IT team to investigate and resolve the connectivity disruption.