What a space guarantee is

Each flexible volume has a space guarantee attribute that controls how its storage is managed in relation to its containing aggregate.

There are three possible settings for the space guarantee attribute:

volume

Data ONTAP preallocates space in the aggregate for the volume. The preallocated space cannot be allocated to any other volume in that aggregate. Space management for a flexible volume with space guarantee of "volume" is equivalent to a traditional volume or to all volumes in versions of Data ONTAP earlier than 7.0 .

file

Data ONTAP pre-allocates space in the volume so that any file in the volume with space reservation enabled can be completely rewritten, even if its blocks are pinned for a Snapshot copy.

none

Data ONTAP reserves no extra space for the volume. Writes to LUNs or files contained by that volume could fail if the containing aggregate does not have enough available space to accommodate the write.

Note: Because out-of-space errors are unexpected in a CIFS environment, do not set the space guarantee to "none" for volumes accessed using CIFS.

Space guarantees are honored only for online volumes. If you take a volume offline, any committed but unused space for that volume becomes available for other volumes in that aggregate. When you bring that volume back online, if there is not enough available space in the aggregate to fulfill its space guarantees, you must use the force (-f) option to disable the volume's space guarantees to bring the volume back online.

Note: Space guarantees are disabled for flexible volumes that are SnapMirror destinations. Space guarantees are also disabled for flexible volumes with a fractional reserve other than 100 (the default setting).

Parent Topic: Storage node

Storage > Volumes

You can use the Volumes window to manage and display information about volumes.

•	Command buttons

•	Volume list

•	Details area

Command buttons

Create

Opens the Create Volume dialog box for adding a new volume.

Edit

Opens the Edit Volume dialog box window for modifying a selected volume.

Delete

Deletes the selected volume or volumes.

Refresh

Synchronizes the volume list with the storage system.

Status

Changes the status of the selected volume or volumes to one of the following statuses:

•

•

•

Provides a list of Snapshot options, including the following:

Create

Displays the Create Snapshot dialog box that you can use to create a new Snapshot copy of the selected volume.

Configure

Configures Snapshot settings.

Clone

Creates a clone of a flexible volume.

Restore

Restores a Snapshot copy of the selected volume.

Resize

Opens the Resize Volume wizard for adjusting the volume size. This option is available only for FlexVol volumes.

Deduplication

If deduplication is present on the storage system, the toolbar displays the Deduplication menu. Use this menu to manually start deduplication or to abort a running deduplication operation.

Volume list

The volume list displays the name and storage information for each volume that has been discovered. Volumes are sorted alphabetically by volume name.

Name

Specifies the name of the volume.

Aggregate

Specifies the name of the aggregate.

Status

Specifies the current status of the volume.

Available space

Specifies the available space on the volume.

Used %

Specifies the percentage of the volume that is current being used.

Total space

Specifies the total space of the volume. This includes space that has been reserved for Snapshot copies.

Details area

The area below the volume list displays detailed information about the selected volume. The details section contains three tabs to display types of volume information.

Details tab

Displays general information about the selected volume, such as the volume status and type.

Space tab

Displays information in four panes.

Available Snapshot Reserve

Illustrates in graph format the available volume space available for Snapshot copies.

Volume

Provides the total capacity of the volume and the space reserved for Snapshot copies.

Available

Provides the amount of space that is currently available on the volume for data and for Snapshot copies, as well as the total space currently available on the volume.

Used

Provides the amount of space on the volume that has been used for data and for Snapshot copies and the total volume space that has been used.

The space tab displays different components depending on whether the volume is configured to use NAS or SAN. If the volume is a NAS volume, the space tab displays the following information:

•	Used data space

•	Available data space

•	Used Snapshot reserve space

•	Available Snapshot reserve space (this is applicable only if the snap reserve is greater than zero)

If the volume is a SAN volume, the space tab displays the following information:

•	Space used by data in LUNs

•	Available space

•	Space used by Snapshot copies

Snapshot Copies tab

The Snapshot Copies tab displays a table of Snapshot copies of the selected volume. The Snapshot Copies tab also displays the following command buttons:

Create

Displays the Create Snapshot dialog box that you can use to create a new Snapshot copy of the selected volume.

Rename

Displays the Rename Snapshot copy dialog box.

Delete

Deletes the selected Snapshot copy.

Restore

Restores the Snapshot copy.

Deduplication tab

The Deduplication tab displays information in four panes.

Volume space graph

Illustrates the volume space used by data and Snapshot copies.

Deduplication properties

Displays information about deduplication properties including whether or not deduplication is enabled on the volume, the deduplication status, current schedule, and the dense-status type.

Last run details

Displays information on the last time deduplication was run on the volume.

Graph legend

Provides an explanation of the symbols appearing on the graph.

Parent Topic: Storage node