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A backup job for a Windows machine being processed using Veeam Agent for Microsoft Windows fails during the disk read operation with either of the following errors: The system cannot find the file specified. Asynchronous read operation failed Failed to upload disk. Agent failed to process method {DataTransfer.SyncDisk}. The device is not ready. Failed to schedule asynchronous read operation Failed to upload disk. Agent failed to process method {DataTransfer.SyncDisk}. Example job report:
These errors occur either because: The shadow copy that Veeam Agent for Microsoft Windows was reading from has been unexpectedly removed. or The shadow copy that Veeam Agent for Microsoft Windows requested the VSS subsystem create was unable to be created. Veeam Agent for Microsoft Windows issues requests to the Microsoft Software Shadow Copy Provider to create a volume shadow copy during a backup. If the shadow copy cannot be created or is unexpectedly removed during the backup operation, the backup job will fail.
Since these issues stem from the Microsoft Volume Shadow Copy Service, it is essential to examine the System Event logs for 'volsnap' events to pinpoint the root cause within your environment. Typically, the most effective resolution for such issues involves redirecting shadow copy storage to a volume that has ample free space and a high number of available IOPS.
Common Volsnap Errors Reported by Customers Event ID: 5 — Description: The shadow copy of volume E: could not be created due to insufficient non-paged memory pool for a bitmap structure. Event ID: 8 — Description: The flush and hold writes operation on volume D: timed out while waiting for a release writes command. Event ID: 9 — Description: The flush and hold writes operation on volume E: timed out while waiting for file system cleanup. Event ID: 14 — Description: The shadow copies of volume E: were aborted because of an IO failure on volume R:. In this example, the shadow copies for E: were redirected to R:, but the underlying storage for R: was failing. Event ID: 16 — Description: The shadow copies of volume R: were aborted because volume , which contains shadow copy storage for this shadow copy, was force dismounted.In this example, the volume where the shadow copies were being stored for R: was dismounted during the backup operation (i.e., drive failure). Event ID: 20 — Description: The shadow copies of volume S: were aborted because of a failed free space computation. Event ID: 24 — Description: There was insufficient disk space on volume C: to grow the shadow copy storage for shadow copies of C:. As a result of this failure all shadow copies of volume C: are at risk of being deleted. Event ID: 25 — Description: The shadow copies of volume T: were deleted because the shadow copy storage could not grow in time. Consider reducing the IO load on the system or choose a shadow copy storage volume that is not being shadow copied.In this example, the T: drive was where the exchange transaction logs were stored and the IO load on the volume was too high to grow the shadow copy, resulting in the need to redirect shadow copies to a different volume. Event ID: 27 — Description: The shadow copies of volume L: were aborted during detection because a critical control file could not be opened. Event ID: 28 — Description: The shadow copy of volume C: could not be created due to a failure in creating the necessary on disk structures. Event ID: 32 — Description: The shadow copies of volume H: were aborted because the shadow copy storage volume was not present. Event ID: 33 — Description: The oldest shadow copy of volume C: was deleted to keep disk space usage for shadow copies of volume C: below the user defined limit. Event ID: 35 — Description: The shadow copies of volume C: were aborted because the shadow copy storage failed to grow. Event ID: 36 — Description: The shadow copies of volume F: were aborted because the shadow copy storage could not grow due to a user imposed limit. Event ID: 39 — Description: When preparing a new volume shadow copy for volume C:, the shadow copy storage on volume C: could not be located in non-critical space. Consider using a shadow copy storage volume that does not have any shadow copies. Event ID: 41 — Description: When preparing a new volume shadow copy for volume C:, the shadow copy storage on volume C: did not have sufficiently large contiguous blocks. Consider deleting unnecessary files on the shadow copy storage volume or use a different shadow copy storage volume.
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