Veeam Support Knowledge Base
Tape Jobs fail with I/O errors or (SCSI) Bus resets

Tape Jobs fail with I/O errors or (SCSI) Bus resets

KB ID:	1887
Product:	Veeam Backup & Replication
Version:	All
Published:	2014-05-13
Last Modified:	2022-04-17

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Challenge

Failures occur during the File to tape or Backup to tape jobs. The jobname.log shows error messages similar to:

error: The request could not be performed because of an I/O device error

error: Tape fatal error.\nThe I/O bus was reset

Cause

Depending on the type of connection, controller or library used, periodic status requests may be handled too slowly and fill up the queue. As a result, Windows may try to recover by resetting the bus.

Solution

You may need to increase StorPort timeouts by creating a "StorPort" key with entries for all tape devices.

You can get DEVICEID & INSTANCE with the following PowerShell command:

gwmi -class win32_tapedrive
                
            

The Registry Values to be created/adjusted are found in the following key:

HKLM\System\CurrentControlSet\Enum\SCSI\DEVICEID\INSTANCE\Device Parameters\StorPort\

Value Name: BusyRetryCount
Value Type: DWORD (32-Bit) Value
Value Data: 1000 (DEC)

Value Name: BusyPauseTime
Value Type: DWORD (32-Bit) Value
Value Data: 1000 (DEC)

Value Name: BusyTimeoutCount
Value Type: DWORD (32-Bit) Value
Value Data: 1000 (DEC)

Reboot the tape server to apply the settings.

Example:

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