Help Center/ Elastic Volume Service/ User Guide/ Cloud Eye Monitoring/ Basic EVS Monitoring Data
Updated on 2025-07-30 GMT+08:00
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Basic 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 the console or APIs provided by Cloud Eye to query the metrics of the monitored objects and alarms generated for EVS. For how to configure alarm rules, see Setting Alarm Rules.

Namespace

SYS.EVS

Metrics

If you find that your disk throughput or IOPS is high or exceeds the upper limit, you are advised to change the disk to a type with high specifications by referring to Changing the EVS Disk Type (OBT). To learn more about disk types and performance, see Disk Types and Performance.

Table 1 EVS metrics

Metric ID

Metric Name

Description

Value Range

Unit

Conversion Rule

Monitored Object (Dimension)

Monitoring Period (Raw Data)

disk_device_read_bytes_rate

Disk Read Bandwidth

Number of bytes read from the monitored disk per second

≥ 0

bytes/s

1024 (IEC)

EVS disk

5 minutes (instantaneous value of the collection point)

disk_device_write_bytes_rate

Disk Write Bandwidth

Number of bytes written to the monitored disk per second

≥ 0

bytes/s

1024 (IEC)

EVS disk

5 minutes (instantaneous value of the collection point)

disk_device_read_requests_rate

Disk Read IOPS

Number of read requests sent to the monitored disk per second

≥ 0

requests/s

N/A

EVS disk

5 minutes (instantaneous value of the collection point)

disk_device_write_requests_rate

Disk Write IOPS

Number of write requests sent to the monitored disk per second

≥ 0

requests/s

N/A

EVS disk

5 minutes (instantaneous value of the collection point)

disk_device_queue_length

Average Queue Length

Average number of read or write requests waiting for processing in the monitoring period for the monitored disk

≥ 0

count

N/A

EVS disk

5 minutes (instantaneous value of the collection point)

disk_device_io_util

Disk I/O Utilization

Percentage of time the monitored disk was performing read or write operations in the monitoring period

0-100

%

N/A

EVS disk

5 minutes (instantaneous value of the collection point)

disk_device_write_bytes_per_operation

Avg Disk Bytes Per Write

Average number of bytes transmitted per I/O write for the monitored disk in the monitoring period

≥ 0

KB/op

N/A

EVS disk

5 minutes (instantaneous value of the collection point)

disk_device_read_bytes_per_operation

Avg Disk Bytes Per Read

Average number of bytes transmitted per I/O read for the monitored disk in the monitoring period

≥ 0

KB/op

N/A

EVS disk

5 minutes (instantaneous value of the collection point)

disk_device_write_await

Disk Write Await

Average await time per I/O write for the monitored disk in the monitoring period

≥ 0

ms/op

N/A

EVS disk

5 minutes (instantaneous value of the collection point)

disk_device_read_await

Disk Read Await

Average await time per I/O read for the monitored disk in the monitoring period

≥ 0

ms/op

N/A

EVS disk

5 minutes (instantaneous value of the collection point)

disk_device_io_svctm

Disk I/O Service Time

Average service time per I/O read or write for the monitored disk in the monitoring period

≥ 0

ms/op

N/A

EVS disk

5 minutes (instantaneous value of the collection point)

disk_device_io_iops_qos_num

IOPS Upper Limit Reached (Count)

Number of times that the IOPS of the monitored disk has reached the upper limit

≥ 0

count

N/A

EVS disk

5 minutes (accumulated value)

disk_device_io_iobw_qos_num

Bandwidth Upper Limit Reached (Count)

Number of times that the bandwidth of the monitored disk has reached the upper limit

≥ 0

count

N/A

EVS disk

5 minutes (accumulated value)

Dimension

Key

Value

disk_name

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

Server ID-volume-Volume ID, for example, 6f3c6f91-4b24-4e1b-b7d1-a94ac1cb011d-volume-31f45764-38b3-44ad-aaca-4015c83371e6

Viewing Monitoring Data

  1. Sign in to the EVS console.
  2. Choose Storage > Elastic Volume Service.

    The Elastic Volume Service page is displayed.

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

    The disk details page is displayed.

  4. On the Servers tab, locate the row that contains the server and click View Metric in the Operation column.

    The Monitoring Metrics page is displayed.

  5. View the disk monitoring data by metric or monitored duration.

Parent Topic: Cloud Eye Monitoring