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Changing Paravirtualized SCSI Controller Queue Depth in VMware ESXi 4.x/5.0 (1017423)
You may need to increase the disk queue depth for a Paravirtualized SCSI adapter to improve performance due to heavy disk workload.
Note: This procedure modifies the Windows registry. Before making any registry modifications, ensure that you have a current and valid backup of the registry and the virtual machine. For more information on backing up and restoring the registry, see the Microsoft article 136393.
- Click Start > Run, type
regedit, and press Enter. The Registry Editor window opens.
- Navigate to this path:
Note: If the end of the path does not exist, create the last keys.
- In the Device key, create or modify a string value named
- Set the value data of the
Note: Do not remove the quotation marks.
- Reboot the guest operating system.
Note: In some scenarios you may need to make changes on the storage as it has similar limitations on I/O per LUN at a time.
Note: The links in this article were correct as of January 7, 2013. If you find a link is broken, provide feedback and a VMware employee will update the link.
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