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https://pubs.vmware.com/vsphere-50/topic/com.vmware.vsphere.storage.doc_50/GUID-08CBB1F0-0CF5-4783-9A12-EB3B5A2BB830.html
ESXi also supports thin-provisioned LUNs. When a LUN is thin-provisioned, the storage array reports the LUN's logical size, which might be larger than the real physical capacity backing that LUN. A VMFS datastore that you deploy on the thin-provisioned LUN …
https://docs.vmware.com/en/VMware-vSphere/6.7/com.vmware.vsphere.storage.doc/GUID-08CBB1F0-0CF5-4783-9A12-EB3B5A2BB830.html
ESXi Versions and Thin Provisioning Support; Supported thin provisioning components ESXi 6.0 and earlier ESXi 6.5 and later ; Thin provisioning : Yes : Yes : Unmap command originating form VMFS : Manual for VMFS5. Use esxcli storage vmfs unmap. Automatic for VMFS6 : Unmap command originating from guest OS : Yes. Limited support. Yes (VMFS6)
https://docs.vmware.com/en/VMware-vSphere/6.5/com.vmware.vsphere.storage.doc/GUID-7552DAD4-1809-4687-B46E-ED9BB42CE277.html
Several versions of the VMFS file system have been released since its introduction. ESXi supports VMFS3, VMFS5, and VMFS6. For all VMFS version, ESXi offers complete read and write support. On all versions of VMFS, you can create and power on virtual machines.
https://www.codyhosterman.com/2018/02/vmware-storage-capacity-reporting-part-i-vmfs-and-thin-virtual-disks/
Mar 06, 2018 · How much storage am I using? But when you introduce the concept of multiple levels of thin provisioning AND data reduction into it, all usage is not equal (does it compress well? does it dedupe well? is it zeroes?). This multi-part series will break it down in the following sections: VMFS and thin virtual disks; VMFS and thick virtual disks
https://pubs.vmware.com/vsphere-50/topic/com.vmware.vsphere.storage.doc_50/GUID-7552DAD4-1809-4687-B46E-ED9BB42CE277.html
VMFS5 provides many improvements in scalability and performance over the previous version. VMFS5 has the following improvements: Support of greater than 2TB storage devices for each VMFS extent. ... see Array Thin Provisioning and VMFS Datastores.
http://www.yellow-bricks.com/2011/02/25/re-vmfs-3-versions-%e2%80%93-maybe-you-should-upgrade-your-vmfs/
Feb 25, 2011 · ESX 4.0 VMFS 3.33 key new feature: optimistic IO; The good thing about it is that you can use all features on all versions. In ESX4 thin provisioning was introduced but it does need the VMFS to be 3.33. It will still work on 3.21. The changes in the VMFS is …
https://communities.vmware.com/thread/121987
Aug 25, 2010 · does esx vmfs support thin provision san lun/volumes ? With my Equallogics box i can present a volume/lun to a windows server with a space i think it will grow over time. say 200 gigs. However on the san side im only using 50 gigs.
http://vsphere-land.com/news/automatic-space-reclamation-unmap-is-back-in-vsphere-6-5.html
So it doesn’t matter if a VM is provisioned thick or thin in vSphere, when you delete it then it will be unmapped on the array. You don’t really need UNMAP if you are using vSphere thin provisioning only as vSphere knows the space is un-allocated inside VMFS.
https://blogs.vmware.com/vsphere/2012/04/vaai-thin-provisioning-block-reclaimunmap-in-action.html
Apr 25, 2012 · Because since VAAI is not supported in Standard and essential edition of vSphere, will the command to reclaim thin provisioning datastore works in these Edition? 2. For VM with thin provisioning VMDK running on thin provisioning VMFS, does unmap reclaim only moved or deleted VM previously occupied space?
https://infosight.hpe.com/InfoSight/media/cms/active/public/tmg_HPE_Nimble_Storage_Deployment_Considerations_for_VMware_vSphere_6_doc_version_family.whz/wuf1461138921225.html
In addition, in a VMFS datastore that contains both thin-provisioned and thick-provisioned virtual disks, you can correct the out-of-space condition by converting thick-provisioned virtual disks to a thin format. You can convert them through a storage vMotion migration to another datastore, followed by a migration back to the source datastore.
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