About Check for Thick Provisioned Disk Space in VMWare

I am pretty certain I have discovered the answer to this a person. It works for me, and helps make some perception (it is a bug).

In my lab, I've a SQL Server virtual device that experienced a one hundred GB databases on it. I deleted the check databases, and the size on the virtual equipment within Windows went right down to the 30 GB array.

If using a VMware Thin Disk and do a complete structure the examine IOs with the Windows 2003 visitor will typically go versus un-allotted areas of the thin file and the VMkernel will “pretend” a reply and return just zeroes. The entire structure will go much faster when finished in vSphere and will never grow the thin disk file.

In case you’re carving out and pushing I/O to one LUN, you’re creating an inherently undesirable design. Just stop and think about what you’re executing from a sensible viewpoint. You have got produced the human equal of stadium whole of individuals moving into and exiting through a single single turnstyle; with one LUN, you will be efficiently serializing your I/O.

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The only real technique to expand it is actually utilizing vmkfstools. Under no circumstances observed this before but seeing it far more now because of Check out.

Specifically we are interested in recognizing whether the array supports the UNMAP primitive for lifeless space reclamation (what we make reference to as being the Delete Status). One more esxcli command is useful for this stage – 'esxcli storage core  product vaai position get -d  ':

FrankCRoth commented Jan 3, 2018 I also experimented with EagerZeroVirtualDisk, the task does consider quite very long and returns with out problems, however afterwards the disk backing eagerlyScub is not really established and around the GUI it disk variety remains thick provisioned lazy zeroed.

In ESXi 6.0, VMDKs of eager zeroed form are expanded during the eager zeroed format, which normally takes quite a long time and may well cause the VM being inaccessible.

March twenty third, 2015 I ran into this right now and I are unable to perception this remains an issue. So in the intervening time there is absolutely no way to extend a keen disk in eager format when the VM is operating?

Above diagram will let you to know the distinction between Thick and Thin provisioning. In the event you give thick provisioning to any VM, you first ought to estimate exactly how much of storage space for your virtual device will need for its whole lifestyle cycle.

You can (apparently) use Storage vMotion to migrate VMDKs to a special datastore, and also have them re-thin official site in the procedure. I don't have Storage vMotion, so I can't comment on the process or its usefulness.

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One among The explanations why the choices are grayed out is because the virtual machine has snapshots taken of it. To check, correct-click the Digital device, find snapshot then snapshot manager.

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