Monitor volume usage

This page provides information on monitoring volume usage.

About volume usage

Volumes are containers for user data and snapshot data and limit their growth to the capacity of the volume.

An application or user that writes more data than allocated into the volume receives an out-of-space error, which can cause application problems. We recommend that you monitor consumption to avoid out-of-space errors.

A common approach is to increase the volume capacity as soon as a certain usage threshold, typically 80%, is reached.

Considerations

Review the following considerations about volume usage:

• You could encounter a lack of free space despite deleting your data and could potentially delete snapshots that reference data you need. For more information, see Snapshots and snapshot-based data management .

• Instead of deleting snapshots manually to free up space, we recommend that you increase volume capacity to avoid out-of-space conditions.

• Inodes are limited resources in a volume and are consumed for every file or directory you create. Although running out of inodes is less common, we recommend that you monitor them in an environment where millions of files are expected in a volume.

Methods for monitoring volume usage

You can monitor volume usage using the methods in the following sections:

Cloud Monitoring-based usage monitoring

You can calculate volume usage from the following volume metrics:

• Volume space: netapp.googleapis.com/volume/bytes_used / netapp.googleapis.com/volume/allocated_bytes * 100

• Volume inodes: netapp.googleapis.com/volume/inode_used / netapp.googleapis.com/volume/inode_limit * 100

Use the volume name and location as a metric label to match metrics that belong together.

You can use Cloud Monitoring alerting to match the result against a threshold like 80% to trigger alert notifications .

The following example shows Prometheus Query Language (PromQL) code to monitor volume usage:

  
 neta 
 pp_googleapis_com 
 : 
 volume_by 
 tes 
 _used 
  
 / 
  
 neta 
 pp_googleapis_com 
 : 
 volume_alloca 
 te 
 d_by 
 tes 
  

You can extend this code for use in a metric-threshold alerting policy .

  
 ( 
 neta 
 pp_googleapis_com 
 : 
 volume_by 
 tes 
 _used 
  
 / 
  
 neta 
 pp_googleapis_com 
 : 
 volume_alloca 
 te 
 d_by 
 tes 
 ) 
 > 
 0.8 
  

Note that the metrics are updated every five minutes. The changes occurring on a smaller time scale are not reflected in Cloud Monitoring.

Client-side usage monitoring

You can check the used and available capacity of a volume by using the client operating system features to query the network mapped drive properties:

• Windows clients: Use the dir command at the command prompt, or use the Drive > Properties command in File Explorer.

• Linux clients: Use the df command for space and df -i for inode monitoring.

Administrative usage monitoring

You can view the usage and provisioned space for volumes on the Volumes pagein the Google Cloud console:

1. Go to the NetApp Volumespage in the Google Cloud console.

   Go to NetApp Volumes

2. The Usedcolumn shows usage percentage and GiB used.

You can use Google Cloud CLI to get the volumes capacity and usage:

  
 gcloud 
  
 neta 
 pp 
  
 volumes 
  
 lis 
 t 
  
 -- 
 f 
 orma 
 t 
 = 
 "table(name, capacityGib, usedGib)" 
  

Inode metrics aren't available using this approach.

What's next

Read about Cloud Logging .