Queue depth windows qlogic

If Execution Throttle exceeds , Queue Depth is The value of Queue Depth is determined as follows: If Execution Throttle falls between 1 and , Queue Throttle should range from 1 to If Execution Throttle exceeds , Queue Depthis The value can range from 0 to This value does not work for versions later than 9. For 9. For drivers later than 9.

Queue Depth defines the maximum queue length supported by one LUN. Queue Depth ranges from 0 to , and is 32 by default in EMC. If Queue Target is 1 , Queue Depth is determined by the number of targets. All rights reserved. Huawei Enterprise Support Community. User Guide New to the community? Find out how to get started! Stay connected! Choose the types of newsletters you want to receive! How Can I Set the Depth o Hi team! Like 0 Dislike 0 Favorite 0 Share Report.

I believe finding the optimal queue depth setting is a combination of art and science. Every environment is unique. The default queue depth setting is simply the default starting point. Ideally, one would measure and record the performance of the individual HBA as well as the overall performance of the fibre channel storage controller for a full week before making any adjustments. The issue is fibre channel HBA's are usually members of a storage network, thus, one must consider the good of the many versus the good of one.

Under certain conditions one server with maximum queue depth settings could saturate the storage controller and cause many other servers HBA's to have increased latency and timeout. In reality sometimes a queue depth of 1 is the optimal setting, especially if round robin multipath is enabled and there are many servers accessing a shared LUN.

On the other hand, if you only have one server then the maximum depth of 64 would be optimal. One of the most important storage network tuning parameters is data transfer size. It is critical that the data transfer size be the same or smaller than the storage controllers block size. Most storage network controllers have a default block size of 64KB or KB.

In the first case the storage controller would receive the KB block in its buffer, then segment it into 8 64KB blocks, then write them to disk, in the second case, the storage controller would buffer the KB, then segment it into 4 KB blocks, then write them to disk. The optimal setting is to match HBA driver block size to the size of the storage controllers block size. I have search a lot for this ,Queue depth is easily set on 10gig adaptor with any OEM but how to set same on 1 Gig Network adaptor.

Office Office Exchange Server. Not an IT pro? Sign in. United States English. Ask a question. Quick access. Search related threads. Remove From My Forums. Asked by:. Archived Forums. Windows Server General Forum. Sign in to vote. Qlogic model is QMH The maximum queue depth value, as was told by Microsoft port driver developer, is Qlogic sets the default value to Please note that the Microsoft storport. Please use the following procedure to change the qd parameter: 1.

Enter a value upto 0xFE.