Qlogic windows tools

I see Queue depth for Qlogic HBA is 16 by default and storage team recommends to increase queue depth.. According to QLogic it is considered a Best Practice to optimize performance for all devices that may communicate with the Target port. To do this QLogic recommends that you divide the Target port's Maximum Outstanding Commands or Queue by the number of host ports Initiators that access the Target port.

This type of computation is used to determine the Target port fan-in ratio as well. Increasing the hba depth will have a negative impact on your performance unless your OS io queue is constantly high.

The default value is 16, increasing the value above 64 has little to no effect, because the maximum parallel execution of SCSI operations is 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. At scale, SAN congestion, although rare, has the potential to quickly spread and significantly disrupt application performance, leading to lost business and productivity. Access to low latency NVMe storage and keeping congestion at bay means applications like SQL Server can scale without the pain that comes with growth.

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And, it gets even better. This easy button management means there is no need to even press a button. This entry was posted on Tuesday, September 7th, at am and is filed under Fibre Channel.

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