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Table Of Contents
Adding and Removing Datastores from a Datastore Cluster
You add and remove datastores to and from an existing datastore cluster by dragging them in the vSphere
Client inventory.
You can add to a datastore cluster any datastore that is mounted on a host in the vSphere Client inventory,
with the following exceptions:
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All hosts attached to the datastore must be ESXi 5.0 and later.
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The datastore cannot be in more than one datacenter in the same instance of the vSphere Client.
When you remove a datastore from a datastore cluster, the datastore remains in the vSphere Client
inventory and is not unmounted from the host.
Using Datastore Clusters to Manage Storage Resources
After you create a datastore cluster, you can customize it and use it to manage storage I/O and space
utilization resources.
Using Storage DRS Maintenance Mode
You place a datastore in maintenance mode when you need to take it out of use to service it. A datastore
enters or leaves maintenance mode only as the result of a user request.
Maintenance mode is available to datastores within a Storage DRS-enabled datastore cluster. Standalone
datastores cannot be placed in maintenance mode.
Virtual disks that are located on a datastore that is entering maintenance mode must be migrated to another
datastore, either manually or using Storage DRS. When you attempt to put a datastore in maintenance
mode, the Placement Recommendations tab displays a list of migration recommendations, datastores
within the same datastore cluster where virtual disks can be migrated. On the Faults tab, vCenter Server
displays a list of the disks that cannot be migrated and the reasons why. If Storage DRS affinity or anti-
affinity rules prevent disks from being migrated, you can choose to enable the Ignore Affinity Rules for
Maintenance option.
The datastore is in a state of Entering Maintenance Mode until all virtual disks have been migrated.
Place a Datastore in Maintenance Mode
If you need to take a datastore out of service, you can place the datastore in Storage DRS maintenance mode.
Prerequisites
Launch the vSphere Client and log in to a vCenter Server system.
Storage DRS is enabled on the datastore cluster that contains the datastore that is entering maintenance
mode.
No CD-ROM image files are stored on the datastore.
There are at least two datastores in the datastore cluster.
Procedure
1 In the vSphere Client inventory, right-click a datastore in a datastore cluster and select Enter SDRS
Maintenance Mode.
A list of recommendations appears for datastore maintenance mode migration.
Chapter 25 Resource Management for Single Hosts
VMware, Inc. 371