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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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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Application Scenarios

Application Scenarios

Installed on an application server, UltraPath for vSphere supports different networks and helps ensure fast and smooth data transfer.

UltraPath for vSphere is applicable to the following scenarios:
  • Dual-link direct connection
  • Dual-link single-switch interconnection
  • Dual-link dual-switch interconnection

Dual-Link Direct Connection

Dual-link direct connection is the simplest, most inexpensive, and most reliable storage network connection, as shown in Figure 1-6.
Figure 1-6  UltraPath for vSphere in dual-link direct connection

The application server uses optical fibers to connect different storage controllers for redundancy. In this networking mode, the path between the application server and the LUN's owning controller is the optimum one while other paths stand by.

In normal cases, UltraPath for vSphere selects the optimum path for data transfer. If the optimum path is down, another standby path is used. After the optimum path recovers, it takes over data transfer again.

Dual-Link Single-Switch Interconnection

The dual-link single-switch interconnection adds one switch on the basis of dual-link direct connection, improving data access and forwarding capabilities, as shown in Figure 1-7.
Figure 1-7  UltraPath for vSphere in dual-link single-switch interconnection

A switch expands host ports to improve access capability of the storage system. Besides, a switch extends the supported distance of transfer so that a remote application server can connect to the storage system through the switch. As only one switch is available in this networking mode, it may encounter a single point of failure. To prevent the failure, you can adopt Dual-Link Dual-Switch Interconnection, as shown in Figure 1-8.

There are four paths between the host and the storage system. The two between the application server and LUN's owning controller are the optimum paths, and the other two are standby paths. In different scenarios, UltraPath for vSphere works as follows:
  • In normal cases, UltraPath for vSphere selects the two optimum paths for data transfer.
  • If one optimum path is faulty, UltraPath for vSphere switches all data to the other optimum path.
  • If both optimum paths are faulty, UltraPath for vSphere uses the two standby paths for data transfer.
After an optimum path recovers, it takes over data transfer again.

Dual-Link Dual-Switch Interconnection

Dual-link dual-switch interconnection adds one switch on the basis of dual-link single-switch interconnection to provide dual-switch forwarding, as shown in Figure 1-8.
Figure 1-8  UltraPath for vSphere in dual-link dual-switch interconnection

With two switches, the network prevents switch single points of failure to boost the network robustness. In this networking mode, UltraPath for vSphere works in the same way as in Dual-Link Single-Switch Interconnection.

On an ESXi host, if LUNs are allocated to a VM in Raw Device Mapping (RDM) mode, the UltraPath cannot be installed on the VM, such as installing UltraPath for Windows on a Windows VM.
Updated: 2019-03-06

Document ID: EDOC1000105152

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