Unable to access network shares after installing Backup Exec System Recovery or Symantec System Recovery

Article:TECH54969  |  Created: 2007-01-25  |  Updated: 2014-02-14  |  Article URL http://www.symantec.com/docs/TECH54969
Article Type
Technical Solution



Unable to access network shares after installing Backup Exec System Recovery or Symantec System Recovery and a WIndows event show below occurs.


Event ID 2011 - The server's configuration parameter "irpstacksize" is too small for the server to use a local device. Please increase the value of this parameter.


Windows 2000, 2003 server OS

WIndows XP


When installing Backup Exec System Recovery, the snapshot module SYMSNAP.SYS depends on a parameter that specifies the number of stack locations in I/O request packets (IRPs) that are used by Windows 2000 Server, by Windows Server 2003, and by Windows XP. You may have to increase this number for certain transports, for media access control (MAC) drivers, or for file system drivers. Each stack uses 36 bytes of memory for each receive buffer. If the IRPStackSize is set too small, it can potentially cause a conflict with SYMSNAP.SYS. The result would be network shares or resources not accessible.


Increase the allocated memory for the IRPSTACKSIZE variable by performing the steps listed below:

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.
1. Start Regedit or Regedt32
2. Locate and then click the following registry subkey: HKEY_LOCAL_MACHINE | SYSTEM | CurrentControlSet | Services | LanmanServer | Parameters
3. Click Edit, point to New, and then select DWORD Value.
4. Type IRPStackSize and press ENTER. Note: IRPStackSize is case sensitive
5. Click Edit, and then Modify
6.  Set the Value Data to 15 then click OK.

Note: The default value of the IRPStackSize parameter is 15. The range is from 11 (0xb hexadecimal) through 50 (0x32 hexadecimal).
If the problem persists after you complete this procedure, increase the value of IRPStackSize even more.
7. Quit Regedit or Regedt32 and then restart the server.

For additional information about the IRP Stacksize, please review the following Microsoft Knowledgebase Article:
Description of the IRPStackSize parameter in Windows 2000, in Windows XP, and in Windows Server 2003






Legacy ID


Article URL http://www.symantec.com/docs/TECH54969

Terms of use for this information are found in Legal Notices