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Provisioned/Maxim Size and Provisioned/Used Space

Posted on 2016-10-19
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Last Modified: 2016-10-29
Provisioned/Maxim Size and Provisioned/Used Space

I am looking at the edit setting of a VM with 2 Hard Disks,
I see Hard disk 1:  Provisioned size: 25 GB and Maximum Size : 467.37 Gb
Hard disk 2 : Provisoned size 51 Gb and maximum size: 493.37 GB

if I select Data Center Icon, then click on Virtual machines Tab, I see for the same VM:
Provisioned Space 80.10GB and Used Space:78.94GB

Can someone explain the above Terminology with their numbers? how they relate to each other?

Thank you
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Question by:jskfan
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LVL 117
ID: 41850752
I am looking at the edit setting of a VM with 2 Hard Disks,
I see Hard disk 1:  Provisioned size: 25 GB and Maximum Size : 467.37 Gb
Hard disk 2 : Provisoned size 51 Gb and maximum size: 493.37 GB

The first group of numbers, relate to Size of virtual machine disk, and the maximum size of the virtual machine disk on the current datastore. So Hard Disk 1 has a size of 25GB, and the maximum size this can be is 467.37GB on the current datastore. Same with hard disk 2, current size is 51GB, and the maximum size in this datastore it can be expanded to is 493.37GB.

(maximum is based on free space on that datastor it will change with time as you deploy and power on VMs, it's not a fixed value).


if I select Data Center Icon, then click on Virtual machines Tab, I see for the same VM:
Provisioned Space 80.10GB and Used Space:78.94GB

Provision Space is the current space which is in use on the datastore, not just the virtual machine disk, but all the other space the VM occupies.

Used space is how much is currently occupied.
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Author Comment

by:jskfan
ID: 41856018
The Maximum size=  is it there by Default ? or you assign it when you create hard disk for VM ? or that represents the space left on the whole Datastore. ?

Provisioned Space 80.10GB and Used Space:78.94GB
There are many VMs in the datastore, I guess they use more than 80.10GB

not clear yet Andrew
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LVL 117
ID: 41856070
The Maximum size=  is it there by Default ? or you assign it when you create hard disk for VM ? or that represents the space left on the whole Datastore. ?

This is the MAXIMUM SIZE of VMDK you can created based on current free space on datastore.

That provisioned space is per VM object that is selected
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Author Comment

by:jskfan
ID: 41857251
I have just checked a VM and it has  Provisioned space  44GB and Used Space  44GB
But when I logged into it I see the disk size is 40 GB and used space is 15 GB

The 40GB is the same size reported when you go to edit settings of the VM in Vsphere client.

These are misleading :
Provisioned space  44GB and Used Space  44GB
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LVL 117
ID: 41857266
Used Space on datastore, not used space in the VM OS.
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Author Comment

by:jskfan
ID: 41857350
what about Provisioned space  44GB ?
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LVL 117
ID: 41857370
add up ALL the files, in the VM Folder, in use with that OS, at the datastore, what is the provisioned space ?
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Author Comment

by:jskfan
ID: 41859991
Andrew,

I guess the trick was in Thin / thick disk
Provisioned Space 80.10GB and Used Space:78.94GB
it is Thin Disk...means all VMs added vmdks amount to 80.10GB but they have used 78.94GB

Provisioned space  44GB and Used Space  44GB
This is Thick disk, whatever is provisioned the first time, it is considered as used.
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Accepted Solution

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Andrew Hancock (VMware vExpert / EE MVE) earned 500 total points
ID: 41859993
That is correct, a thick disk will take up ALL space on the datastore, as soon as it's provisioned.

A thin disks, grows to the maximum size defined by the disk settings.
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Author Closing Comment

by:jskfan
ID: 41865173
Thank you
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