What does a disk or volume set to Standard mean?

[jamgwert81]

I've noticed when provisioning any Instance the default is set to "Standard".  What I notice is after deployed it appears to be using some sort of Thick deployment based on the qcow2 file size.  Not finding anything in the official guide that outlines what Standard actually is.

Can someone outline what this means?

If this is truely a form of a Thick disk, what is the reason for making Thick be the default vs Thin?

Thanks.

[cievo]

What is this screen from?

[PeterTzvetanov]

Hi jamgwert81,

standard depends on the type that you are going to deploy if it is a qcow or ISO or VMDK. But you can also define what you want to do additionally.  But to answer the question it will be thin if you use Standard.

With regards

[jamgwert81]

Screen is from the new Instance wizard. 

During deployment it defaults the Volume (aka Disk) of the first drive to be Standard.  Looks like any additionals added also default to Standard.

@PeterTzvetanov This would be for a new instance/vm deployed on HVM.

My Virtual Image was created as a 40GB Thin and after capturing it, in the Virtual Images section the size of the image aligns with Thin provisioning

I ended up deploying a VM as a test with the OS disk being "Standard" and the secondary disk as "Thin"

I was getting confused by the UI because under Storage -> Volumes it lists the Standard disk as "Disk" and the thin disk as "Thin" but then only presents the defined size.  The use of Disk vs Thin makes me think that Disk isn't actually Thin provisioned.

But it appears checking the ceph disks on CLI they are in fact both Thin provisioned.

Just curious will there be any plans in the future to be able to see the Standard and Thin disks actual used space in the UI?