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

Log in to the DWS console.
Choose Dedicated Clusters > Clusters and locate the cluster to be monitored.
In the Operation column of the target cluster, click Monitoring Panel. The database monitoring page is displayed.
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.

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**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.	-

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.

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**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.	-

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.

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**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.	-