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How to Extend a Datastore in vCenter

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Read this guide to learn how to extend a datastore in vCenter. In this guide, I will show an example using an iSCSI storage device.

Step 1: Extend the iSCSI LUM

To extend a datastore in vCenter, you must first allocate additional spaces on the iSCSI LUM. This is done on the storage device.

If you use a Windows Server iSCSI target, you can extend the iSCSI virtual disk from Server Manager. To do that, right-click the iSCSI virtual disk and select Extend iSCSI Virtual Disk.

Then, follow the wizard to add additional storage space to the LUM.

Right-click the iSCSI virtual disk and select Extend iSCSI Virtual Disk. 

Then, follow the wizard to add additional storage space to the LUM.

Step 2: Extend the Datastore

In my home lab, I have a 650 GB datastore. However, the iSCSI storage device (LUM) has a total capacity of 920GB.

So I can extend the datastore to 920 GB.

In my home lab, I have a 650GB datastore. However, the iSCSI storage device (LUM) has a total of 920GB which means that we can extend the datastore up to 920GB. In my home lab, I have a 650GB datastore. However, the iSCSI storage device (LUM) has a total of 920GB which means that we can extend the datastore up to 920GB.
However, the iSCSI storage device (LUM) has a total capacity of 920GB which means that we can extend the datastore up to 920GB. However, the iSCSI storage device (LUM) has a total capacity of 920GB which means that we can extend the datastore up to 920GB.

Here are the steps:

  1. While signed in to the vCenter web client, select the datastores node. Then, right-click the datastore and select Increase Datastore Capacity.
While signed in to the vCenter web client, select the datastores node. Then, right-click the datastore and select Increase Datastore Capacity. While signed in to the vCenter web client, select the datastores node. Then, right-click the datastore and select Increase Datastore Capacity.
  1. On the first page of the wizard, vCenter will check for devices with free space. If there is, it displays the device.

Select the iSCSI device used to create the datastore you intend to increase its capacity. Then, click Next to progress to the next step.

Select the iSCSI device used to create the datastore you intend to increase its capacity. Then, click Next to progress to the next step.Select the iSCSI device used to create the datastore you intend to increase its capacity. Then, click Next to progress to the next step.
  1. The “Specify Configuration” page automatically selects all available space. In my example, there is 300 GB of free space.

You can accept to add the entire free space to the datastore or enter a size. In this example, I’ll use the entire 300 GB free space.

The "Specify Configuration" page automatically selects all available space. In my example, there is 300 GB of free space. The "Specify Configuration" page automatically selects all available space. In my example, there is 300 GB of free space.
  1. Finally, review the settings to be used to extend the datastore, including the new size. If you’re happy with it, click FINISH.
Finally, review the settings to be used to extend the datastore, including the new size. If you're happy with it, click FINISH. Finally, review the settings to be used to extend the datastore, including the new size. If you're happy with it, click FINISH.

Conclusion

Extending the capacity of a datastore in vCenter is a pretty easy task. However, before you do that, you must first add more space to the storage device used in creating the datastore.

I hope you enjoyed reading this guide. Kindly let me know your thoughts about the guide by responding to our “Was this page helpful?” feedback request below.

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Victor Ashiedu

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