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How do I change the depth of my queue in Windows?

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How do I change the depth of my queue in Windows?

Changing Qlogic Queue Depth Windows

  1. Click.
  2. Select HKEY_LOCAL_MACHINE and follow the tree structure down to the QLogic driver as follows:
  3. Double-click DriverParameter to edit the string, for example: DriverParameter REG_SZ qd=32.
  4. Add “qd=” to the “Value data:” field.
  5. Enter a value up to 254 (0xFE).
  6. Click OK.

Where is QLogic HBA model in Windows?

Use the san_version.exe command to display the Windows Host Utilities version and the firmware and driver versions of HBAs installed in the host.

  1. About this task. HBA information is displayed only for Emulex and QLogic FC and FCoE adapters detected in the host.
  2. Example.
  3. After you finish.

What is queue depth in linux?

Linux forwards SCSI commands to the storage server until the number of pending commands exceeds the queue depth. If the server lacks the resources to process a SCSI command, Linux queues the command for a later retry and decreases the queue depth counter. Linux then waits for a defined ramp-up period.

How do I check my HBA card?

Check HBA card and its driver’s info in linux(RHEL6)

  1. To check if the host has HBA card installed and which type of card installed, physiical slot, driver, module information. # lspci | grep -i fibre.
  2. check if the driver/module loaded in kernel.
  3. check author,description,mdule file name, license, driver version.

How do I determine my queue depth?

Count the total number of FC initiators in all the hosts that connect to one FC target port. Multiply by 128. If the result is less than 2,048, set the queue depth for all initiators to 128.

What is queue depth in NVMe?

Whereas AHCI/SATA has one command queue with a depth of 32 commands, NVMe is designed to have up to 65,535 queues with as many as 65,536 commands per queue. The much higher queue depth for NVMe allows for a greater number of commands that can be executed simultaneously.

How is queue depth calculated in HBA?

Queue Depth is determined by Execution Throttle when the driver is loaded during initialization. The actual value of Queue Depth is sent to the storage driver by the HBA STOR Miniport Device driver. For 8 GB HBAs, Execution Throttle is 65535 and Queue Depth is 254 by default.

What is the max speed of the queue in QLogic?

For the QLogic STORport drivers the Queue Depth parameter is called Max Throttle – it can be changed using the SANSurfer utility. EMC recommended value is 256. However if you have RecoverPoint then EMC recommends lowering this to max 250.

What happens if queue depth is set too high?

If Queue Depth is set too high, one server may affect the performance of the entire SAN network. Set Queue Depthbased on performance requirements of different applications. You can use the following two methods to set Queue Depth for QLogic and Emulex HBAs on Windows.

What are quequeue depth and execution throttle?

Queue Depth is a parameter for storage driver Storport and defines the number of I/Os to be processed on one LUN. The default value is 20 and the maximum value is 254. Execution Throttle is an HBA parameter and defines the maximum number of commands running on each port.

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