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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 Front-End Link Bandwidth

Checking the Front-End Link Bandwidth

The overall bandwidth of a storage system is determined by the bandwidths of the front-end link, controller, and back-end disk. In bandwidth testing, the front-end link bottleneck is most common.

In terms of estimating the front-end link bandwidth, the network plan, switch cascading, and the weakest point that restricts the bandwidth capability must be understood. For example, if a host is connected to a switch through two optical fibers whereas the switch is connected to a controller through only one 8 Gbit/s FC cable, the maximum unidirectional bandwidth is 780 MB/s. Table 4-2 lists the tested bandwidth of common Fibre Channel links.

Table 4-2 Tested bandwidth of common Fibre Channel links

Link

Unidirectional Bandwidth (MB/s)

Bidirectional Bandwidth (MB/s)

4 Gbit/s Fibre Channel link

390

690

8 Gbit/s Fibre Channel link

780

1300 to 1400

NOTE:

A Fibre Channel link provides the maximum bandwidth in the event of sequential large I/Os. If random small I/Os are transmitted, the maximum bandwidth is reduced.

Host HBAs, Fibre Channel switches and optical modules can work at different rates. The actual transmission rate is the lowest one among them. If the link rate is inappropriate or a link failure occurs, the performance may decrease. To achieve the optimal performance and reliability, the link configuration must ensure load balancing and redundancy.

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Updated: 2019-07-17

Document ID: EDOC1100049152

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