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VMware vSphere Disk Provisioning for a Virtual Machine
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VMware vSphere Disk Provisioning for a Virtual Machine

There are two type of provisioning; Thin and Thick but in production Thick is widely practiced. Thick provisioned disk takes entire allocated space and give better performance. Though thin provisioned disk does not require entire allocated space immediately but if you have more number of thin provisioned disks in your vSphere environment, high chances are that datastore will run out of disk space. More over performance too is lower in thin provisioned disk as compared to thick provisioned disk.

Apart from provisioning disks you will have to be careful in selecting type of Virtual disk; i.e. Independent disk or non-Independent. First and far-most Independent disks are non-snapshot supportive. That means if you create an Independent disk you have further two options to select which are Persistent or Nonpersistent.

If you select an Independent disk in Persistent mode that means data is written to disk permanently.

If you select an Independent disk in Nonpersistent mode that means data written to disk is not permanent. The Virtual machine will loose all changes when it is rebooted. 
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