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ONTAP tools for VMware vSphere 9.10
A newer release of this product is available.

Resize datastores

Contributors netapp-manishc

Resizing a datastore enables you to increase or decrease the storage for your virtual machine files. You might need to change the size of a datastore as your infrastructure requirements change.

About this task

If you want VSC to resize the containing volume when it resizes the VMFS datastore, you should not use the Use existing volume option under Storage attributes section when initially provisioning VMFS datastore, but instead let it automatically create a new volume for each datastore.

You can increase or decrease the size of an NFS datastore but for a VMFS datastore, you can only increase the size. Resizing of datastore is also supported for FlexGroup datastores with auto grow and shrink option. A FlexGroup that is part of a traditional datastore and FlexVol volume that is part of a vVols datastore cannot shrink below the existing size but can grow by 120% maximum. Default snapshots are enabled on these FlexGroup and FlexVol volumes.

Note If you are using All SAN Array (ASA) type storage platforms with ONTAP 9.9.1 or later, only then you can create vVols datastores with vmdk size greater than 16TB.


  1. From the vSphere Client Home page, click Hosts and Clusters.

  2. In the navigation pane, select the datacenter that contains the datastore.

  3. Right-click the datastore and select NetApp ONTAP tools > Resize non-vVols datastore.

  4. In the Resize dialog box, specify a new size for the datastore, and then click OK.

    You can run the REDISCOVER ALL option in the Storage Systems menu to manually update the storage listing under Storage Systems and dashboard, or wait for the next scheduled refresh.