If System Manager can't recognize server disks then problem can be Windows WMI polling method.
In DVRlog you should see this kind of error
ERROR DVRServer.exe - Cannot get logical disk informationSystem.Management.ManagementException: Invalid class
at System.Management.ManagementException.ThrowWithExtendedInfo(ManagementStatus errorCode)
at System.Management.ManagementObjectCollection.ManagementObjectEnumerator.MoveNext()
at Mirasys.Servers.Recorder.DVRServices.Monitoring.MonitoringService.GetDriveInformation()
Step-by-step guide
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Create a system restore point (Steps: https://support.microsoft.com/en-us/help/17127/windows-back-up-restore)
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From the command prompt with administrative rights or elevated privileges change directory to C:\Windows\System32\Wbem and run the following command: mofcomp.exe CimWin32.mo
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For re-registering associated .dll if one exists use following command: regsvr32 CIMWin32.dll
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Restart the Windows Management Instrumentation Service
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Start System Manager and check if you can see disks
If this is not helping do also these steps
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Go to start-run and type in wmimgmt.msc
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Right click on Local Wmi Control (Local)and select properties
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Click on the Security tab and expand Root folder. You can now see cimv2.
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Create a system restore point (Steps: https://support.microsoft.com/en-us/help/17127/windows-back-up-restore)
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Execute the console application if there is no error, exit.
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From the command prompt with administrative rights or elevated privileges, execute the following steps and execute the following this: net stop winmgmt
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Open a Windows Explorer and locate the path to C:\windows\system32\WBEM\ folder and rename the Repository folder to something else like RepositoryOLD (right click and choose 'Rename Folder').
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Restart the computer
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From the command prompt with administrative rights or elevated privileges, execute the following steps and execute the following this: net stop winmgmt
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From the command prompt with administrative rights or elevated privileges, execute the following steps and execute the following this: winmgmt /resetRepository
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Restart the computer