Data is never uncompressed on disk due to a read operation, as this would reduce the amount of savings on the storage resource. (size given when creating the disk), used and free size of a disk using name like 'datastore1 vCenter/vCenter.vmx' Reply. This includes committed and uncommitted values to calculate thin provisioned rates. If the compressed data being requested resides on disk, the data is first read into System Cache, uncompressed to a temporary location, and the host is sent the data. You could also use the storage property to get the per Datastore usage. If the compressed data already resides in System Cache, the data is uncompressed to a temporary location, the data is sent to the host, and the temporary location is released. This is because on Unity If the data is compressed, it must first be uncompressed before the data is sent to the host. If you add up the "Allocated size" and "Current savings" on Unity (570+700 GB= 1.27TB), it gives you the same "used space" as on ESXI host because host is not aware of the "Compression feature".On the VMware end the Datastore "LI_UNITY400" shows the size used space of 1.27 TB which is way more than 570GB Allocation size on Unity.Here’s how to loose these errors on certain stores while enforcing them on others. This knowledge will enable you to isolate over-utilized storage (i.e., datastore and virtual disks), the VMs responsible for their excessive usage, and the VMs. Comparing Datastore usage to Disk usage on the Server VM: Doesnt Match Im a little confused and could use some clarification from someone. Errors like non-VI workload detected on your ISO LUN, Datastore usage on disk and so on. Very nice to have, but some of these alarms are so generic, that datastores are simply always in an alarmed state. In other words, it will be deleted when the virtual. Once a VMDK file is associated with a virtual machine, its lifecycle will be bound to the virtual machine. When creating a virtual disk, a new VMDK file may be created or an existing VMDK file may used as a backing. A VMFS datastore named "LI_UNITY400" is created on Unity with "Data reduction": New and improved in vSphere: Datastore alarms. The Disk.create operation provides the ability to create a new virtual disk.vSphere supports versions 3 and 4.1 of the NFS protocol. If you found this or any other post helpful please consider the use of the Helpful/Correct buttons to award points. The ESXi host can mount the volume and use it for its storage needs. If you want to reclaim the space your options are to use VMware converter or to use sdelete inside the VM to zero out the free space and storage vMotion that vmdk to another datastore while specifiying thin disk. VCenter will not be aware of the "Data savings " happening on Unity as it's a feature on Unity. An NFS client built into ESXi uses the Network File System (NFS) protocol over TCP/IP to access a designated NFS volume that is located on a NAS server.
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