Updated on 2025-07-30 GMT+08:00

Viewing Node Metrics of a DWS Cluster

On the node monitoring page, you can view the real-time consumption of nodes, memory, disks, disk I/O, and network I/O.

Node Monitoring

  1. Log in to the DWS console.
  2. Choose Dedicated Clusters > Clusters and locate the cluster to be monitored.
  3. In the Operation column of the target cluster, click Monitoring Panel. The database monitoring page is displayed.
  4. In the navigation pane on the left, choose Monitoring > Node Monitoring.

Overview

On the Overview tab page, you can view the key resources of a specified node based on the node name. Table 1 Node metrics lists the metrics.

Table 1 Node metrics

Metric Name

Description

Monitoring Interval (Raw Data)

Node Name

Name of a cluster node

180s

CPU Usage (%)

Ratio of the time taken by tasks on the CPU to the total available time

60s

Memory Usage (%)

Ratio of the allocated and used memory to the total memory

60s

Average Disk Usage (%)

Ratio of the disk read/write time to the total time in a unit time

30s

IP Address

IP address of the node

180s

Disk I/O (KB/s)

Total amount of data read from or written to a disk per second

60s

TCP Protocol Stack Retransmission Rate (%)

Ratio of the number of times that TCP data packets need to be resent to the total number of times that TCP data packets are sent within a specified period

60s

Network I/O (KB/s)

Data volume transmitted through the network per second

60s

Status

Node status

180s

Monitoring

You can click the button in the Monitoring column to view the overall performance metric topology of the node in the last 1 hour, last 3 hours, last 12 hours, last 24 hours, last 7 days, or last 15 days.

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Disks

On the Disks tab page, you can view the real-time disk resource consumption of a node by node name and disk name. Table 2 Disk metrics lists the metrics.

Table 2 Disk metrics

Metric Name

Description

Monitoring Interval (Raw Data)

Node Name

Name of a node in a cluster

180s

Disk Name

Disk name

30s

Disk Type

The following disk types are supported:

  • System disk: disk for installing the OS and booting the system
  • Data disk: stores user data and application data.
  • Log disk: stores system logs and application logs.

30s

Disk Capacity (GB)

Storage capacity of a disk

30s

Disk Usage (%)

Disk usage

The sum of the used disk space and available disk space is not equal to the total disk space. This is because a small amount of space is reserved in each default partition for system administrators to use. Even if common users have run out of space, system administrators can log in to the system and use their space required for solving problems.

Run the Linux df command to collect the disk capacity information, as shown in the following figure.

/dev/sda4: Used(5757444) + Available(540228616) != Total(569616888)

  • Filesystem: path name of the device file corresponding to the file system. Generally, it is a hard disk partition.
  • IK-blocks: number of data blocks (1024 bytes) in a partition.
  • Used: number of data blocks used by the disk.
  • Available: number of available data blocks on the disk.
  • Use%: percentage of the space used by common users. Even if the space is used up, the partition still reserves the space for system administrators.
  • Mounted on: mount point of the file system.

30s

Disk Read Rate (KB/s)

Rate at which data is read from the device per second

30s

Disk Write Rate (KB/s)

Rate at which data is written to the device per second

30s

I/O Wait Time (await, ms)

Average waiting time for each I/O request

60s

I/O Service Time (svctm, ms)

Average processing time for each I/O request

60s

IOPS

Number of input/output operations per second

60s

Monitoring

You can click the button in the Monitoring column to view the disk performance metric topology of the node in the last 1 hour, last 3 hours, last 12 hours, last 24 hours, last 7 days, or last 15 days.

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Network

On the Network tab page, you can view the real-time network resource consumption of a node by node name and NIC name. Table 3 Network metrics lists the metrics.

Table 3 Network metrics

Metric Name

Description

Monitoring Interval (Raw Data)

Node Name

Name of a cluster node

180s

NIC Name

Name of the NIC

60s

NIC Status

NIC status (up/down)

60s

NIC Speed (Mbps)

NIC speed

60s

Received Packets

Number of packets received by the NIC

60s

Sent Packets

Number of packets sent by the NIC

60s

Lost Packets Received

Number of received data packets that are dropped by the NIC

60s

Receive Rate (KB/s)

Rate at which data is received by the NIC

60s

Transmit Rate (KB/s)

Rate at which data is sent by the NIC

60s

Monitoring

You can click the button in the Monitoring column to view the network performance metric topology of the node in the last 1 hour, last 3 hours, last 12 hours, last 24 hours, last 7 days, or last 15 days.

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