===== [V8] ISSUE: [ReadFile] (381) The cloud operation is not supported on a read-only volume (backup on OneDrive folder with a file backup) =====
Article ID:
8115
Reviewed:
2021-04-28
Product Version:
AhsayACB / AhsayOBM: 8.1 to 8.x
OS: All platforms
===== Problem Description =====
When performing a file backup on a OneDrive folder with Files On-Demand enabled, the following error message is received in the backup report:
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[New File] File="C:\Users\username\folder\file" Error="java.io.IOException: [ReadFile] (381) The cloud operation is not
supported on a read-only volume ...
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or
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[New File] File="C:\Users\username\folder\file" Error="java.io.IOException: [CreateFileW] (395) Access to cloud file is
denied ...
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Note: This issue will only affect file backup on OneDrive folder with Files On-Demand enabled
===== Cause =====
When the "Files On-Demand" is enabled for your OneDrive folder, it saves disk space by not saving the file on the computer, instead, new files created online or on another device appear as online-only files in File Explorer.
===== Resolution =====
To resolve the issue, there are a few options:
- Option 1
Disable the File On-Demand option. Note that this will increase the disk space usage on the affected client computer.
Click Here for details on how to disable the option.
- Option 2
Unselect the OneDrive folder from the backup source of the affected backup set.
Create a new Cloud File Backup set to backup the OneDrive data.
- Option 3 (not recommended)
Patch the AhsayCBS server and AhsayOBM / ACB client software to hotfix version 8.5.0.127 or above.
Click Here for instruction on how to patch the AhsayCBS.
Click Here for instruction on how to patch the AhsayOBM / ACB.
After the patch, the backup job will skip the backup of the online (on-demand) files, an informative message will be displayed to suggest that the backup of the corresponding file was skipped.
===== Keywords =====
one, drive, onedrive, cloud, on, demand, ondemand