Are all newly created vmdk disks thin provisioned by default in ESX 3.5 and ESX 4.0 when you create them via the GUI?
I know that when I've used vmkfstools in the past I can say whether I want to use thick ones or thin ones, but I'm not sure what the GUI does.
By default are thick disk.
During creation in vSphere Client you can choose thin provisioning.
To be exact, by default zeroedthick disk is provisioned.
zeroedthick (default) .
Space required for the virtual disk is allocated during creation. Any data remaining on the physical device is not erased during creation, but will be zeroed out at a later time during virtual machine read and write operations.
Space required for the virtual disk is allocated at creation time. Unlike with the zeroedthick format, the data remaining on the physical device is zeroed out during creation. Disks in this format might take much longer to create than other types of disks.
Space required for the virtual disk is allocated during creation. This type
of formatting doesn.t zero out any old data that might be present on this allocated space.
VMware vExpert '2009
That will actually depend on the storage/protocol that you use - if you are using Storage array over NFS most of them if not all by default
create thin provisioned disks.
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