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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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Monitoring Indicators

Monitoring Indicators

This section describes the different components' monitoring indicators related to an OLTP application.

Table 2-1 lists the components monitored when an OLTP application is running.

Table 2-1 Monitoring items related to an OLTP application

Component

Monitoring Indicator

Meaning

Recommended Threshold

Controller

Average I/O response time (μs)

Average time during that a controller spends on processing each I/O within a statistical period.

Set the latency based on service requirements. An alarm is triggered when the latency reaches three times of the specified value. An alarm is cleared when the latency drops to two times of the specified value.

For example, if a user requires the latency of an OLTP application to be 15 ms, a 45-ms latency triggers an alarm, and the alarm is cleared when the latency drops to 30 ms.

Average CPU usage (%)

CPU utility within a specified period (5 seconds by default). This item indicates how busy a CPU is.

An alarm is triggered when CPU utility reaches 90%. An alarm is cleared when the CPU usage drops to 70%.

Front-end port

Average I/O response time (μs)

Average time duration spent on processing each I/O that passes through a front-end port within a statistical period.

Set the latency based on service requirements. An alarm is triggered when the latency reaches three times of the specified value.

For example, if the latency of an OLTP application is 15 ms, a 45-ms latency triggers an alarm.

Disk

Average I/O response time (μs)

Average time spent on processing each read or write I/O delivered to a disk within a statistical period.

The latency varies with the disk type. The latency of a solid state drive (SSD) is longer than 10 ms. An alarm is generated if the threshold is reached 50 times within 3 minutes. An alarm is cleared if the threshold is reached less than 30 times within 3 minutes.

Usage (%)

Disk utility within a specified period (5 seconds by default). This item indicates how busy a disk is.

An alarm is triggered when the disk usage reaches 90%. An alarm is cleared when the disk usage drops to 70%.

LUN

Average I/O response time (μs)

Average time spent in processing each read or write I/O delivered to a LUN within a statistical period.

Set the latency based on service requirements. An alarm is triggered when the latency reaches three times of the specified value.

For example, if a user requires the latency of an OLTP application to be 15 ms, a 45-ms latency triggers an alarm.

Storage pool

Average I/O response time (μs)

Average time spent in processing each read or write I/O delivered to a storage pool within a statistical period.

Set the latency based on service requirements. An alarm is triggered when the latency reaches three times of the specified value.

For example, if a user requires the latency of an OLTP application to be 15 ms, a 45-ms latency triggers an alarm.

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Updated: 2019-07-17

Document ID: EDOC1100049152

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