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Flat provisioning esxi5

Posted on 2014-04-15
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Last Modified: 2016-10-27
What is this exactly?

I see we can use this for acronis v9 which is supported on v5.0 of esci or hight but unsure the differences.
I get think and thick but not flat...
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Question by:CHI-LTD
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Andrew Hancock (VMware vExpert / EE MVE^2) earned 500 total points
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Flat is usually referred to as Lazy Zero Thick! When data is written in the VM, it's zeroed first in the VMDK, and then written.

You also have Eager Zero Thick! - at VMDK creation, all the VMDK is pre-zero-ed this enhances the performance of the writes, as the VM does not need to pre-zero first before the write.

Eager Zero Thick! 10-15% faster than "flat" or Lazy Zero Thick

If you are referring to disk provisioning....
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by:CHI-LTD
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i can select, thin, thick or flat (esxi 5 only) within the replication job.  They are all thin at present.

From their help:

Provisioning mode

Specify the provisioning mode that will be used on target VM replicas. The modes are thin provisioning/thick provisioning/flat provisioning. The default mode is Thin provisioning. Flat provisioning mode is used for ESXi version 5.0 or later.
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by:Andrew Hancock (VMware vExpert / EE MVE^2)
Andrew Hancock (VMware vExpert / EE MVE^2) earned 500 total points
ID: 40001943
That's correct, these are the different types of VMDKs which are supported.

1. Thin,
2. Lazy Zero Thick (flat!)
3. Eager Zero Thick

difference between the two varities of thick, is the zero-ing of blocks in the VMDK, which affects performance, and some VMs, which use clustering must be Eager Zero Thick
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