Automatic space reclamation (UNMAP) is back in…

Automatic space reclamation (UNMAP) is back in vSphere 6.5 -via vSphere-land

Automatic space reclamation (UNMAP) is back in…

A long time ago in a vSphere version far, far away VMware introduced support for automatic space reclamation which allowed vSphere to send UNMAP commands to a storage array so space from deleted or moved VMs could be un-allocated (reclaimed) on the storage array. This was a welcome feature as block storage arrays have no visibility inside a VMFS volume so when any data is deleted by vSphere the array is unaware of it and it remains allocated on the array. UNMAP was supposed to fix that so when data was deleted vSphere would send a string of UNMAP commands to the array telling it exactly which disk blocks it could have back.


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About etqui

My name is Eelco de Boer and I work for DellEMC VCE as a Solutions Architect Virtualisation. I am interested in design (both high level and technical), product/solution management and helping customers solve their pains. I like to take a broader look and approach and prefer to look at a problem from several angles. My experience focuses mainly on solutions based on VMware technologies and software. I am a VMware Certified Professional, VMware Certified Advanced Professional Data Center Design, vExpert 2014, 2015 and 2016. This blog represents my own opinion and views.

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