High Utilization Quotas Test

Quotas are specified for the following reasons:

  • To limit the amount of disk space or the number of files that can be used by a user or group, or that can be contained by a qtree.
  • To track the amount of disk space or the number of files used by a user, group, or qtree, without imposing a limit.
  • To warn users when their disk usage or file usage is high

You specify quotas using the /etc/quotas file. Quotas are applied to a specific volume or qtree.

When Data ONTAP receives a request to write to a volume, it checks to see whether quotas are activated for that volume. If so, Data ONTAP determines whether any quota for that volume (and, if the write is to a qtree, for that qtree) would be exceeded by performing the write operation. If any hard quota would be exceeded, the write operation fails, and a quota notification is sent. If any soft quota would be exceeded, the write operation succeeds, and a quota notification is sent.

This test reports the number of Windows/Unix users and Unix user groups that crossed the disk space (both hard and soft) and file usage quotas set. With the help of these metrics, you can promptly detect abnormal disk space and file usage at the volume/qtree-level.

Target of the test : A NetApp Cluster

Agent deploying the test : An external/remote agent

Outputs of the test : One set of results for each type of quota set at the volume/qtree-level.

Configurable parameters for the test
Parameters Description

Test Period

How often should the test be executed.

Host

The IP address of the storage controller cluster.

Port

Specify the port at which the specified host listens in the Port text box. By default, this is NULL.

User

Here, specify the name of the user who possesses the readonly role. If such a user does not pre-exist, then, you can create a special user for this purpose using the steps detailed in Creating a New User with the Role Required for Monitoring the NetApp Cluster.

Password

Specify the password that corresponds to the above-mentioned User.

Confirm Password

Confirm the Password by retyping it here.

Authentication Mechanism

In order to collect metrics from the NetApp Cluster, the eG agent connects to the ONTAP management APIs over HTTP or HTTPS. By default, this connection is authenticated using the LOGIN_PASSWORD authentication mechanism. This is why, LOGIN_PASSWORD is displayed as the default Authentication Mechanism.

Use SSL

Set the Use SSL flag to Yes, if SSL (Secured Socket Layer) is to be used to connect to the NetApp Unified Storage System, and No if it is not.

API Report

By default, in most environments, NetApp Cluster listens on port 80 (if not SSL-enabled) or on port 443 (if SSL-enabled) only. This implies that while monitoring the NetApp Cluster, the eG agent, by default, connects to port 80 or 443, depending upon the SSL-enabled status of the NetApp Cluster - i.e., if the NetApp Cluster is not SSL-enabled (i.e., if the Use SSL flag above is set to No), then the eG agent connects to the NetApp Cluster using port 80 by default, and if the NetApp Cluster is SSL-enabled (i.e., if the Use SSL flag is set to Yes), then the agent-NetApp Cluster communication occurs via port 443 by default. Accordingly, the API Port parameter is set to default by default.

In some environments however, the default ports 80 or 443 might not apply. In such a case, against the API Port parameter, you can specify the exact port at which the NetApp Cluster in your environment listens, so that the eG agent communicates with that port for collecting metrics from the NetApp Cluster.

Exclude Aggregates

If you wish to exclude certain aggregates from the scope of monitoring, specify a list of comma-separated aggregates in this text box. By default, none will be displayed here.

Timeout

Specify the duration (in seconds) beyond which the test will timeout if no response is received from the device. The default is 120 seconds.

Detailed Diagnosis

To make diagnosis more efficient and accurate, the eG Enterprise suite embeds an optional detailed diagnostic capability. With this capability, the eG agents can be configured to run detailed, more elaborate tests as and when specific problems are detected. To enable the detailed diagnosis capability of this test for a particular server, choose the On option. To disable the capability, click on the Off option.

The option to selectively enable/disable the detailed diagnosis capability will be available only if the following conditions are fulfilled:

  • The eG manager license should allow the detailed diagnosis capability
  • Both the normal and abnormal frequencies configured for the detailed diagnosis measures should not be 0.
Measurements made by the test
Measurement Description Measurement Unit Interpretation

Quotas

Indicates the number of quotas of this type.

Number

The detailed diagnosis of this measure indicates whether the quota has been set for a user/group/qtree, the target of the quota, the volume on which the quota is applied, the qtree on which the quota is applied, the percentage of disk limit used, the percentage of file limit used, and the number of windows users, unix users and unix group users who violated each type of quota.

Windows users

Indicates the number of windows users involved in quota violation of this quota type.

Number

Ideally, the value of these measures should be low. A high value indicates that there is space constraint in the disk/volume/LUN which in turn will affect the users who are accessing them.

Unix users

Indicates the number of unix users involved in quota violation of this quota category.

Number

Unix groups

Indicates the number of unix groups involved in quota violation of this quota category.

Number