Cloudstack 4.7 Secondary Storage problem

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Hi, all

I am facing secondary storage problem.

I am using NFS Server to use primary and secondary storage. 

After rebooting the host, 

In Dashboard Cloudstack , it says Secondary Storage 0.00 KB / 0.00 KB 

Primary Storage is okay. 

 

After all, system VMs are not up. It was working fine before rebooting. 

 

I have tried several times of restart of Management service. 

 

Any ideas?

 

Thanks,