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This topic describes Microsoft iSCSI Configuration Parameter Recommendations.

We recommend the following Microsoft iSCSI Initiator configuration parameters for target and staging hosts. See How to Modify the Windows Registry on the Microsoft Support site for details about configuring registry settings.

A Windows Server reboot is required after changing iSCSI configuration parameters.


Registry KeyRegistry ValueTypeData

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\iSCSI\


MaxRequestHoldTimeREG_DWORD0x384 (900)
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\DiskTimeoutValueREG_DWORD0x384 (900)


Interfaces\<Interface GUID>

TcpAckFrequencyREG_DWORD0x1 (1)


{4D36E97B-E325-11CE-BFC1-08002BE10318}\<Instance Number>\Parameters

iSCSIDisableNagleREG_DWORD0x1 (1)

For systems running Windows 2003 see Microsoft Knowledge base article 815230 for hotfix information regarding changing TcpAckFrequency.


  1. Windows Target iSCSI parameter recommendations also apply to VSS / PPT / staging servers.

  2. TimeoutValue should be TimeOutValue