Expanding VMWare DataStore

Posted on 2015-01-23
Medium Priority
Last Modified: 2016-11-23

We are expanding our RAID set on our Powervault SAN. Current Dell Powervault SANs allow you to hot add drives to expand a RAID.

We'll be expanding the actual RAID and then the Powervault Virtual Disk which takes up the entire room of the RAID Array.

After this is done, we will of course need to expand the VMware Datastore. We are running ESXi 5.5. How do you go about hot expanding a datastore?

Thanks, Jonathan
Question by:RFVDB
  • 2

Accepted Solution

Shahnawaz Ahmed earned 2000 total points
ID: 40567651
Try Vmware KB Article


OR You can simply present another LUN and add it to the existing datastore to increase its size. re-scan the storage adapters on your ESXi hosts and then increase the datastore size from its properties window.
LVL 126
ID: 40567695
You may want to think carefully in doing this, as RAID expansion, can take many hours or days to complete successfully, as the current RAID is broken, and expanded on the fly, this can also cause massive work for all the disks, and sometimes can cause disks to fail prematurely.

You may also want to consider, the creation of a new RAID array, and then creating a new datastore and presenting to ESXi.

Sometimes, increasing a datastore is not possible, if ESXi 5.5 OS installation, also shares the same LUN, due to the maximum number of partitions per LUN, and it then involves manually using partition table utilities to alter the partition layout to increase the VMFS partition.

So if after selecting the current datastore, and selecting properties to Increase the datastore, it does not appear correctly, this could be the cause.

Author Comment

ID: 40585251
Thanks Shahnawaz, looks like your link will do the trick. I'll let you know how it goes.

Andrew. Right, luckily the SAN has a hot add option to expand the RAID and it will do it in the background in a live production area. Once this is done, we can then expand it in VMware.

In normal circumstances I would move the VMs to another datastore but in this case its a small setup and there's only one SAN datastore that's completely used up.

Luckily ESXi is installed locally on all three hosts.
LVL 126
ID: 40585257
Yes, they all do it live, but it will take time to complete, and performance can be poor!

Also make sure you have full backups before you start!

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