Media write errors reported in job history log, backup job failure.

Article:TECH76317  |  Created: 2009-01-02  |  Updated: 2013-01-02  |  Article URL
Article Type
Technical Solution


Media write errors reported in job history log, backup job failure.


Job log shows the below error :-

Final Error : 0xe00084f4- An unknown error has occurred

A device attached to the system is not functioning.
V-79-57344-34036 - An unknown error has occurred.


The server was a H/P server, where the tape library, was an 1x8 G2 auto-loader, with 1 Ultrium 4 tape drive.   The SCSI controller was an LSI logic.    The driver loaded in Windows:

lsi_scsi.sys  1/19/08  3:42:56 AM   96312 6.0.6001.16612      LSI Logic Fusion-MPT SCSI Driver (StorPort)


There have been seen multiple instances in which a setting called the RetryBusyCount setting, is set too low and this leads to the failure of the backup jobs. Below are the instructions that are needed in order to make this registry change in the backup server. The original setting calls for a value set at 75 decimal, but it is recommended to change it to 100 decimal or 64 hex, as is needed in the registry entry.  


NOTE:  Please take the backup of registry before making this change to preserve the original version. 
Regedit > File > Export and save it on the disk.
Warning: Incorrect use of the Windows registry editor may prevent the operating system from functioning properly. Great care should be taken when making changes to a Windows registry. Registry modifications should only be carried-out by persons experienced in the use of the registry editor application. It is recommended that a complete backup of the registry and workstation be made prior to making any registry changes.
If the backup jobs continue to fail, then it is recommended to set this value higher,   It is feasible to have this configuration setting set as high as 250, until the issue is resolved.  If issue persists at max value of 250,  then further troubleshooting steps would be in order to determine the source,  causing the failure. Your registry entry would be under the LTO-4 and not the LTO-3 as shown below.

To resolve the media write errors, the following steps were taken to modify the registry in Windows on the media server.

1 Open Windows regedit.

2 Open the path HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\SCSI\[device identifier name for the tape LTO-3 tape device]\[numeric device instance id for the LTO-3 tape device]\Device Parameters\

3 Add a key named Storport under Device Parameters (if there is not one there already).

4 Add a key name called BusyRetryCount. The key type is REG_DWORD, and the value should be set to 4b hex (75 decimal).

5 Exit Regedit.

6 Reboot the server.

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An unknown error has occurred.

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Final Error : 0xe00084f4- An unknown error has occurred

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