DWS_2000000012 Node Data Disk Latency Exceeds the Threshold

Description

GaussDB(DWS) collects the data disk latency of each node in the cluster every 30 seconds. This alarm is generated when the average latency of a data disk on a node exceeds 400 ms (configurable) in the last 10 minutes (configurable), and is automatically cleared when the average latency drops below 400 ms.

If the data disk latency of a node is always greater than the alarm threshold, this alarm is generated again after 24 hours (configurable).

Alarm Attributes

Alarm ID	Alarm Category	Alarm Severity	Alarm Type	Service Type	Auto Cleared
DWS_2000000012	Management plane alarm	Important: > 400 ms	Operation alarm	GaussDB(DWS)	Yes

Alarm Parameters

Category	Name	Description
Location information	Name	Node Data Disk Latency Exceeds the Threshold
	Type	Operation alarm
	Generation time	Time when the alarm is generated
Other information	Cluster ID	Cluster details such as resourceId and domain_id

Impact on the System

High disk latency will slow down the data read/write speed, causing the cluster performance to deteriorate.

Possible Causes

The database is in peak hours and there are a large number of read and write requests.

Handling Procedure

On the Clusters > Dedicated Clusters page, locate the row that contains the target cluster and click Monitoring in the Operation column.
In the navigation pane on the left, choose Monitoring > Node Monitoring. On the Node Monitoring page, view the CPU usage, disk usage, and memory usage.

If the CPU usage and disk I/O rate are high, the cluster is in peak hours. You can adjust the latency threshold based on service requirements. For details, see 3.
Return to the console home page. In the navigation pane on the left, choose Management > Alarms. On the displayed page, click View Alarm Rule in the upper left corner.
Locate the row that contains Node Data Disk Latency Exceeds the Threshold, and click Modify in the Operation column. On the displayed page, change the threshold.