When you need to create new virtual machines on a datastore, or when the virtual machines running on this datastore require more space, you can dynamically increase the capacity of a VMFS datastore.

Use one of the following methods:

Add a new extent. An extent is a partition on a storage device, or LUN. You can add up to 32 new extents of the same storage type to an existing VMFS datastore. The spanned VMFS datastore can use any of all its extents at any time. It does not need to fill up a particular extent before using the next one.

Grow an extent in an existing VMFS datastore, so that it fills the available adjacent capacity. Only extents with free space immediately after them are expandable.

Note

If a shared datastore has powered on virtual machines and becomes 100% full, you can increase the datastore's capacity only from the host, with which the powered on virtual machines are registered.

1

Log in to the vSphere Client and select a host from the Inventory panel.

2

Click the Configuration tab and click Storage.

3

From the Datastores view, select the datastore to increase and click Properties.

4

Click Increase.

5

Select a device from the list of storage devices and click Next.

If you want to add a new extent, select the device for which the Expandable column reads No.

If you want to expand an existing extent, select the device for which the Expandable column reads Yes.

6

Select a configuration option from the bottom panel.

Depending on the current layout of the disk and on your previous selections, the options you see might vary.

Option

Description

Use free space to add new extent

Adds the free space on this disk as a new datastore extent.

Use free space to expand existing extent

Grows an existing extent to a required capacity.

Use free space

Deploys an extent in the remaining free space of the disk. This option is available only when adding an extent.

Use all available partitions

Dedicates the entire disk to a single datastore extent. This option is available only when adding an extent and when the disk you are formatting is not blank. The disk is reformatted, and the datastores and any data that it contains are erased.

7

Set the capacity for the extent.

By default, the entire free space on the storage device is available.

8

Click Next.

9

Review the proposed layout and the new configuration of your datastore, and click Finish.

After you grow an extent in a shared VMFS datastore, refresh the datastore on each host that can access this datastore, so that the vSphere Client can display the correct datastore capacity for all hosts.