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thick provisioned vmdk

Posted on 2013-10-23
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Are there any issues in vm's having thick provisioned disks ? I have seen many healthcheck scanners flag this as a major issue, can you elaborate what the issue is with vm's with thick provisioned disks?
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Question by:pma111
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vmdude earned 1000 total points
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No issue at all with thick provisioned disks. Thick provisioned disk actually improve write performance, however unlike thin provisioned disks, all the space allocated is explicitly reserved.
With thin provisioned disks you can give the VM (and hence the guest operating system) say a 100GB disk, but behind the scenes only the data that is actually stored on the partition is used up on the storage. With thick provisioned disks, all 100GBs would be used on the storage regardless or how much or how little the guest operating system is seeing.
Hope that helps
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by:Andrew Hancock (VMware vExpert / EE MVE^2)
Andrew Hancock (VMware vExpert / EE MVE^2) earned 1000 total points
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I have no idea, why a thick provisioned disk, maybe an health issue?

There were some debates a few years ago, about performance of Applications running on virtual machines disk, and you should use a RAW LUN (e.g. RDM).

But this was eventually debunked as a myth....

But see this:-

RDM versus VMDK performance

Conclusion: VMFS and RDM have similar performance. Don’t choose RDM for performance.
Source:http://www.vfrank.org/2011/03/22/performance-rdm-vs-vmfs/
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by:dipopo
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by:vmdude
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Going back to the original question however, there are no issues using thick provisioned disks in VMware - its a whole other debate as to which type of disk provisioning you use.

Bottom line is that if a health scanner is flagging up issues with storage, it will not be because the disks are thick provisioned. More likely it will be related to performance, disk space or something else, but that is just speculation at this point :)
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