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Performance Monitoring Guide

OceanStor Dorado V3 Series V300R002

This document describes performance monitoring of storage systems, including the monitoring method, indicator planning, configuration monitoring, and problem diagnosis.
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Checking the Zoning Settings on Fibre Channel Switches

Checking the Zoning Settings on Fibre Channel Switches

In terms of load balancing and reliability, hosts and storage are connected to Fibre Channel switches to form a crossover network, which is different from being interconnected, in an actual site deployment. If zones are incorrectly configured, link contention exists, leading to a reduction in host performance.

Similar to the VLAN function of an Ethernet switch, the zoning function of a Fibre Channel switch allows users to isolate links, thereby reducing faulty domains and link contention between hosts or applications. In a zoning plan based on the point to point rule, each zone contains only one initiator and one target. This policy minimizes the interference between devices in different zones.

For example, Figure 4-4 shows that each of the two hosts at a site is connected to two switches to form a crossover network. Each switch is connected to controllers A and B through two 8 Gbit/s Fibre Channel cables, respectively. No zone is configured.

Figure 4-4 Network example (without zoning)

Theoretically, the maximum bandwidth is 3.2 GB/s. However, where the dd command is used in performance tests, the maximum read bandwidth is 2.4 GB/s. The reason is that the eight physical paths between the two switches and the storage system are shared between the two hosts. In the event of a heavy load, link contention occurs, leading to bandwidth fluctuations and the failure to reach the maximum bandwidth.

Based on zoning, shared links can be grouped for isolation purposes. See Figure 4-5. Each host uses four links between switches and controllers, preventing link contention. After zones are configured, the tested bandwidth is 3.2 GB/s.

Figure 4-5 Network example (with zoning)

In addition to zoning, you can group shared links for isolation purposes by using multipathing software to disable paths or binding a LUN group with a port group.

Switches are provided by different vendors. Zoning can be configured on a GUI or CLI. If a problem occurs, the switch vendor can assist in diagnosing the problem.

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Updated: 2019-04-08

Document ID: EDOC1100049152

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