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OceanStor UltraPath for vSphere V100R008C50 User Guide 06

This document covers the functions, features, installation, configuration, upgrade, uninstallation, maintenance, troubleshooting, and FAQs of OceanStor UltraPath for vSphere (UltraPath forvSphere). UltraPath for vSphere is the multipathing software developed by HuaweiTechnologies Co., Ltd (Huawei for short). The document aims at helping users to be fully familiar with UltraPath for vSphere and its use.

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Optimum Path Selection

Optimum Path Selection

By accessing LUN configuration information of a storage system, UltraPath for vSphere finds the fastest path to transfer each data stream to the storage system and uses the path for data transfer.

To ensure stable system running, a storage system is usually equipped with two or more controllers to implement redundant backup. To prevent two or more controllers from simultaneously writing the same LUN to damage data, the storage system must specify an owning controller for the LUN so that only the owning controller can read and write the LUN. If the application server requests accessing the LUN through a non-owning controller, the request is forwarded to the owning controller. In this case, the direct path between the LUN and its owning controller delivers the fastest I/Os. Therefore, it is the optimum path.

UltraPath for vSphere is able to obtain information about an owning controller. Therefore, it can automatically select one or more paths for data streams to achieve the optimum I/O speed.

For example, in Figure 1-2, controller A is the owning controller and UltraPath for vSphere selects the path between the application server and controller A as the optimum path.
Figure 1-2  Optimum path selection by UltraPath for vSphere

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Updated: 2019-03-06

Document ID: EDOC1000105152

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