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https://docs.vmware.com/en/VMware-vSphere/6.7/com.vmware.vsphere.storage.doc/GUID-08CBB1F0-0CF5-4783-9A12-EB3B5A2BB830.html
The ESXi host integrates with block-based storage and performs these tasks: The host can recognize underlying thin-provisioned LUNs and monitor their space use to avoid running out of physical space. The LUN space might change if, for example, your VMFS datastore expands or if you use Storage vMotion to migrate virtual machines to the thin-provisioned LUN.
https://docs.vmware.com/en/VMware-vSphere/6.0/com.vmware.vsphere.storage.doc/GUID-08CBB1F0-0CF5-4783-9A12-EB3B5A2BB830.html
A VMFS datastore that you deploy on the thin-provisioned LUN can detect only the logical size of the LUN. For example, if the array reports 2TB of storage while in reality the array provides only 1TB, the datastore considers 2TB to be the LUN's size. ... ESXi does not support enabling and disabling of thin provisioning on a storage device ...
https://pubs.vmware.com/vsphere-50/topic/com.vmware.vsphere.storage.doc_50/GUID-AC8E9C20-C05F-4FB5-A5DA-11D0A77A291B.html
Thin provisioning is a method that optimizes storage utilization by allocating storage space in a flexible on-demand manner. Thin provisioning contrasts with the traditional model, called thick provisioning. With thick provisioning, large amount of storage space is provided in …
https://www.vembu.com/blog/reclaiming-thin-provisioned-storage-space-with-vmware-unmap/
When making use of a directly attached storage array and utilizing thin provisioned disks with VMware VMFS, when data is deleted with thin provisioning, the storage array is unaware of that deletion. The storage array still “sees” that data as being allocated.
https://kb.netapp.com/app/answers/answer_view/a_id/1030691/~/how-to-enable-unmap-on-existing-thin-volumes-for-vmware-esxi-
Note: In the case of VMware ESXi, only Thin Volumes with VMFS-5 or VMFS-3 datastores on them will support UNMAP operations directly from the VMware ESXi host. If Thin Volumes are being used for Physical Raw Device Mappings (pRDM) or Virtual Raw Device Mappings (vRDM) directly to a Virtual Machine, follow the UNMAP KB article for the Operating ...
https://www.dell.com/community/VNX/EMC-Thin-LUNs-and-VMFS-Datastores/m-p/7095531/highlight/true
From the VNX with MCx Virtual Provisioning White Paper, page 42: For VMware environments, the Virtual Machine File System (VMFS) has many. characteristics that are thin-friendly. First, a minimal number of thin extents are. allocated from the pool when a VMware file system is created on thin …
https://blogs.vmware.com/virtualblocks/2018/09/10/vmware-vsan-6-7u1-storage-reclamation-trim-unmap/
Sep 10, 2018 · VMware vSAN supports thin provisioning, which lets you, in the beginning, use just as much storage capacity as currently needed and then add the required amount of storage space at a later time. Using the vSAN thin provisioning feature, you can create virtual disks in a thin format. For a thin virtual disk, vSAN provisions the entire space required for the disk’s current and future ...
https://blogs.vmware.com/vsphere/2012/03/thin-provisioning-whats-the-scoop.html
Mar 01, 2012 · Thin Provisioning Concerns. There are a few concerns with Thin Provisioning. Possibly the biggest issue that we have with Thin Provisioning is running out of space on a device that is Thin Provisioned at the back-end. Prior to vSphere 5.0, we didn't have any notifications about this in the vSphere layer, and when the thinly provisioned ...
https://www.vmware.com/content/dam/digitalmarketing/vmware/en/pdf/support/landing-pages/virtual-support-day-storage-best-practices-june-2012.pdf
Thin Provisioning – VM Level VM disk is created @ 0b, until used, and then grows @ VMFS Block size as needed Minor performance penalty for provisioning / zeroing. Disk cannot currently be shrunk – once grown, it stays grown. •There are some workarounds for this, but they are not guaranteed
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