===== [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:

No.	Type	Timestamp	Log
*	...	...	...
*	info	...	...
*	erro	YYYY/MM/DD hh:mm:ss	[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 ... ...
*	...	...	...

No.	Type	Timestamp	Log
*	...	...	...
*	info	...	...
*	erro	YYYY/MM/DD hh:mm:ss	[New File] File="C:\Users\username\folder\file" Error="java.io.IOException: [CreateFileW] (395) Access to cloud file is denied ... ...
*	...	...	...

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