Using datastores with esxi hosts use vmfs or vsphere

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Using Datastores with ESXi HostsUse VMFS or vSphere Virtual Volumes datastores when accessing block-level storage:VMFS is optimized for storing and accessing large files.A VMFS datastore can have a maximum volume size of 64 TB.vSphere Virtual Volumes can use advanced storage services that include replication, encryption, deduplication, and compression on individual virtual disks.vSphere Virtual Volumes supports such vSphere features as VMware vSphere® vMotion™, vSphere Storage vMotion, snapshots, linked clones, Flash Read Cache, and vSphere DRS.Use RDMs if any of the following conditions are true of your virtual machine:The VM is taking storage array-level snapshots.It is clustered to a physical machine.It has large amounts of data that you do not want to convert into a virtual disk.
VMware vSphere: Install, Configure, Manage|6-45© 2018 VMware, Inc.Creating and Viewing VMFS Datastores VMFS datastores serve as repositories for virtual machines.Using the New Datastore wizard, you can create VMFS datastores on any SCSI-based storage devices that the host discovers, including Fibre Channel, iSCSI, and local storage devices.
VMware vSphere: Install, Configure, Manage|6-46© 2018 VMware, Inc.Browsing Datastore ContentsYou use the datastore file browser to manage the contents of your datastores.
VMware vSphere: Install, Configure, Manage|6-47© 2018 VMware, Inc.Managing Overcommitted DatastoresA datastore becomes overcommitted when the total provisioned space of thin-provisioned disks is greater than the size of the datastore.Actively monitor your datastore capacity:Alarms assist through notifications:Datastore disk overallocationVirtual machine disk usageUse reporting to view space usage.Actively manage your datastore capacity:Increase datastore capacity when necessary.Use vSphere Storage vMotion to mitigate space usage problems on a particular datastore.
VMware vSphere: Install, Configure, Manage|6-48© 2018 VMware, Inc.Increasing the Size of VMFS DatastoresIn general, before making any changes to your storage allocation:Perform a rescan to ensure that all hosts see the most current storage.Record the unique identifier.Increase a VMFS datastore’s size to give it more space or to possibly improve performance.Ways to dynamically increase the size of a VMFS datastore:Add an extent (LUN).Expand the datastore within its extent.You can expand but you cannot shrink a VMFS datastore.Expand the datastore on the existing extent.Add an extent to the existing VMFS.LUN 6LUN 7SAN3SAN3VMFS
VMware vSphere: Install, Configure, Manage|6-49© 2018 VMware, Inc.Deleting or Unmounting VMFS DatastoresAn unmounted datastore remains intact but cannot be seen from the hosts that you specify. The datastore continues to appear on other hosts, where it remains mounted.

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