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After live resizing a VHDX file, the following issue can occur based on the operation that was performed: Shrink — If the VHDX associated with a VM is shrunk, the backup task for that VM will fail, and the following exception will be found in the Agent.<Job name>.Source.<VM name> log file: cli| VHDX.GetDiskInformation cli| (EString) DiskPath = vhdx://<shadowSpec><extent path="full path to the disk" shadow="full path to the disk in the shadow copy" isAutoRecovery="False" /></shadowSpec> cli| (EString) Option.Container = {disk} cli| - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - vhd| Opening VHDX by full path: [full path to the disk]. cli| File 'HostFile{full path to the disk in the shadow copy}' opened (read_only: true, no_cache: false) dsk| Loading VHDX log. dsk| Loading VHDX log. Failed. cli| File 'HostFile{full path to the disk in the shadow copy}' closed cli| ERR |Failed to process method {VHDX.GetDiskInformation} cli| >> |VHDX file was truncated. Current file size: [1503242747904]. Flushed file size: [1825365295104]. cli| >> |Failed to replay VHDX log. cli| >> |--tr:Failed to load VHDX log. cli| >> |An exception was thrown from thread [6440]. cli| Trying to poll message from the notification channel (from server side). net| Triggering AUX channel synchronization. Request id: {guid} net| Received synchronization response {guid} cli| No server exception available. cli| ERR |Failed to process {Invoke} command cli| >> |Details: cli| >> |VHDX file was truncated. Current file size: [1503242747904]. Flushed file size: [1825365295104]. cli| >> |Failed to replay VHDX log. cli| >> |--tr:Failed to load VHDX log. cli| >> |Agent failed to process method {VHDX.GetDiskInformation}. Expand — If the VHDX associated with a VM is expanded, the backup job for that VM may become inconsistent.
These issues occur because the live resize of a VHDX does not automatically flush metadata.
Consider the following when performing live VHDX resizing: Shrinking — After shrinking a disk associated with a VM that is protected by Veeam Backup & Replication, the VM must be power cycled (not a reboot, but a full shutdown and power on). Expanding — After expanding a disk associated with a VM that is protected by Veeam Backup & Replication, an Active Full for that individual VM must be run.
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