How do I change my HBA queue depth?

How do I change my HBA queue depth?

Modify the QLogic HBA queue depth by updating the firmware parameter Execution Throttle from the QLogic HBA BIOS. From the main menu, select the Adapter Configuration option. From the list of adapter configuration parameters, select the HBA Parameters option. From the list of HBA ports, select the required HBA port.

What is queue depth in VMware?

The Queue Depth is 32 by default, and because 2 buffers are reserved, 30 are available for I/O data. The default Queue Depth value for Brocade adapters is 32. Notes: VMware recommends keeping the HBA Vendors uniform across all hosts participating in a cluster.

What is queue depth in ESXi?

To identify the storage device queue depth: Run the esxtop command in the service console of the ESX host or the ESXi shell (Tech Support mode). The value listed under DQLEN is the queue depth of the storage device. This is the maximum number of ESX VMKernel active commands that the device is configured to support.

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 Q depth value?

Queue depth, in storage, is the number of pending input/output (I/O) requests for a volume. Performance-demanding applications can enough generate storage I/Os to create queue depths in the hundreds.

What is disk queue depth?

Disk Queue Depth is the number of outstanding IO requests that are waiting to be performed on a disk.

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.

What is NVMe queue depth?

NVMe also has a much more robust command-queue structure with a significantly larger queue depth than AHCI/ SATA. 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.

What is IO queue depth?

The queue depth or queue length or queue size is the number of pending IO requests in the system. The value of queue depth determines how many IO operations your application can line up, which the storage disks will be processing.

What is IO queue?

Operating System – Device Queue – IO Queue Device queue contains the processes which are waiting for the completion of I/O request. Each device has its own device queue. This IO queue is read by a driver(part of OS) and put on an input queue. From input data queue, it is moved to the ready queue for CPU processing.

How do I reduce disk queue depth?

Fixes

1. Reduce the number or size of reads and writes being performed.
2. Upgrade the disk to a higher tier or increase disk size to get better IO performance and/or more IOPS.
3. Split IO activity across multiple disks.

What is an acceptable disk queue length?

A good rule of thumb is that there should never be more than half the number of spindles in the queue length. If you have a 10-disk RAID volume, the queue length should be less than 5.

What is queue depth registry in QLogic HBAs?

For 9.1.8.25 and later versions, Queue Depth registry is recompiled. QLogic HBAs configure Queue Depth based on the value of Queue Depth predefined by the storport driver while the Windows operating system controls Queue Depth completely depending on the storport.sys driver.

How do I set the queue depth on Windows hosts?

Setting queue depths on Windows hosts. On Windows hosts, you can use the LPUTILNT utility to update the queue depth for Emulex HBAs and the SANsurfer HBA manager utility to update the queue depths for Qlogic HBAs. Run the LPUTILNT utility located in the c:\\\\WINNT\\system32 directory. Select Drive Parameters from the pull down menu on the right side.

How do I update HBA queue depths in Emulex?

To update Emulex HBA queue depths. Steps. Run the LPUTILNT utility located in the c:\\WINNTsystem32 directory. Select Drive Parameters from the pull down menu on the right side. Scroll down and double-click QueueDepth. To update Qlogic HBA queue depths. Steps. Run the SANsurfer HBA manager utility.

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.