Table of ContentsView in Frames

How aggregates and nodes are associated with Infinite Volumes

The aggregate list of the containing Storage Virtual Machine (SVM) with Infinite Volume determines which aggregates the Infinite Volume uses, as well as who can create an Infinite Volume and which nodes the Infinite Volume uses.

The aggregate list can be specified or unspecified, which is represented as a dash ("-"). By default, when a cluster administrator creates any SVM, its aggregate list is unspecified. After the SVM is created, the cluster administrator can specify the aggregate list by using the vserver add-aggregates command.

Considerations when choosing to specify the aggregate list or leave it unspecified

If you are dedicating an entire cluster to the SVM with Infinite Volume, you can leave the aggregate list of an SVM with Infinite Volume unspecified. In most other situations, you should specify the aggregate list of an SVM with Infinite Volume.

Leaving the aggregate list of an SVM with Infinite Volume unspecified has the following outcomes:

How the aggregate list contains candidate aggregates

The aggregate list of an SVM with Infinite Volume acts only as a candidate aggregate list for an Infinite Volume. An Infinite Volume uses aggregates according to various factors, including the following requirements:

How the aggregate list determines the nodes

An Infinite Volume uses every node that has an aggregate in the aggregate list of an SVM with Infinite Volume.

When changes to the aggregate list take effect

Changes to the aggregate list do not have any immediate effect. The aggregate list is used only when the size of an Infinite Volume changes. For example, if you add an aggregate to the aggregate list of an SVM with Infinite Volume, that aggregate is not used until you modify the size of the Infinite Volume.

If you add aggregates from a new node to the aggregate list and then resize the Infinite Volume, whether the Infinite Volume uses the aggregates from the new node depends on several variables, including the size of existing constituents and how much the Infinite Volume was increased in size.

How the aggregate list can be filtered

You can filter the aggregate list for the SVM by using advanced parameters that control which aggregates are used for each type of constituent, such as data constituents. Unlike the aggregate list for the SVM, these aggregate-selection parameters apply only to a single operation. For example, if you use the parameter for data constituent aggregates when you create the Infinite Volume and then resize the Infinite Volume without using the parameter, the Infinite Volume uses the SVM aggregate list.