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What impacts the I/O performance of Windows service SMB protocol?

Last Updated: Mar 07, 2018

Symptom

By default, the large mtu option is disabled on a Windows SMB client, which affects the increase in I/O performance.

Solution

You can modify the following registry key to enable the large mtu option:

HKLM\System\CurrentControlSet\Services\LanmanWorkstation\Parameters

Create a DWORD at this location with the key named DisableLargeMtu and value set to 0. Mount the file system again to apply the change.

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