# Viewing EVS Monitoring Data

#### Description

This section describes monitored metrics reported by EVS to Cloud Eye as well as their namespaces and dimensions. You can use console or APIs provided by Cloud Eye to query the metrics of the monitored objects and alarms generated for EVS.

#### Namespace

SYS.EVS

#### Metrics

Table 1 EVS metrics
Metric ID | Metric Name | Description | Value Range | Monitored Object | Monitoring Period (Raw Data)
--- | --- | --- | --- | --- | ---
disk_device_read_bytes_rate | Disk Read Bandwidth | Number of bytes read from the monitored disk per second Unit: Bytes/s | ≥ 0 bytes/s | EVS disk | 5 minutes
disk_device_write_bytes_rate | Disk Write Bandwidth | Number of bytes written to the monitored disk per second Unit: Bytes/s | ≥ 0 bytes/s | EVS disk | 5 minutes
disk_device_read_requests_rate | Disk Read IOPS | Number of read requests sent to the monitored disk per second Unit: Requests/s | ≥ 0 Requests/s | EVS disk | 5 minutes
disk_device_write_requests_rate | Disk Write IOPS | Number of write requests sent to the monitored disk per second Unit: Requests/s | ≥ 0 Requests/s | EVS disk | 5 minutes

#### Dimension

Key | Value
--- | ---
disk_name | Server ID-drive letter, for example, 6f3c6f91-4b24-4e1b-b7d1-a94ac1cb011d-vda (vda is the drive letter)

#### Viewing Monitoring Data

1. Log in to the management console.
2. Click in the upper left corner and select the desired region and project.
3. Under Storage, click Elastic Volume Service.

   The disk list page is displayed.

4. In the EVS disk list, click the name of the disk you want to view the monitoring data.

   The disk details page is displayed.

5. On the Attachments tab, locate the row that contains the server and click View Monitoring Data in the Operation column.

   The monitoring graphs page is displayed.

6. You can view the disk monitoring data by metric or monitored duration.

   For more information about Cloud Eye, see the Cloud Eye User Guide.