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Thin/Thick Provisioning

Any expert out there to explain the difference between thin and thick provisionning disk.
If I understand when creating a new VM , a disk size is allocated.  for instance if 5GB is allocated what would be the effect of making the disk thin or thick provisionning?

thanks
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Let me see if I understand what you are saying:

Thin:
if 5GB is allocated , then as long as the files are written to disk , the used space is growing up to 5GB.

a- what about the unused space before the 5GB are used up ? Does that mean if I have written 3GB out of the existing 5GB, then from the 2GB left I can create another Virtual disk?
b- what if the 5GB are used up does it automatically allocate more space?

thanks
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OK ....
IF I allocate 5GB THICK, means 5GB is all taken by that VM machine.?
IF I allocate 5GB THIN but only 3 have been used , means the unused space still can be allocated to another VM Machine ?

is that the difference ?
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When monitored by Alarms, Thin is helpful in case we cannot make an assumption how much disk size we need for a certain VM.
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thanks
VMware
VMware

VMware, a software company founded in 1998, was one of the first commercially successful companies to offer x86 virtualization. The storage company EMC purchased VMware in 1994. Dell Technologies acquired EMC in 2016. VMware’s parent company is now Dell Technologies. VMware has many software products that run on desktops, Microsoft Windows, Linux, and macOS, which allows the virtualizing of the x86 architecture. Its enterprise software hypervisor for servers, VMware vSphere Hypervisor (ESXi), is a bare-metal hypervisor that runs directly on the server hardware and does not require an additional underlying operating system.

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