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replicated storage devices, one datastore is the replication source and the other is the replication target. Data

written to the source datastore is replicated to the target datastore on a schedule controlled by the

replication software of the array. When you configure Site Recovery Manager to work with a storage

replication adapter (SRA), the replication source is at the protected site and the replication target is at the

recovery site.

A datastore provides storage for virtual machine files. By hiding the details of physical storage devices,

datastores simplify the allocation of storage capacity and provide a uniform model for meeting the storage

needs of virtual machines. Because any datastore can span multiple devices, Site Recovery Manager must

ensure that all devices backing the datastore are replicated before it can protect the virtual machines that use

that datastore. Site Recovery Manager must ensure that all datastores containing protected virtual machine

files are replicated. During a recovery or test, Site Recovery Manager must handle all such datastores

together.

To achieve this goal, Site Recovery Manager aggregates datastores into datastore groups to accommodate

virtual machines that span multiple datastores. Site Recovery Manager regularly checks and ensures that

datastore groups contain all necessary datastores to provide protection for the appropriate virtual machines.

When necessary, Site Recovery Manager recalculates datastore groups. For example, this can occur when

you add new devices to a virtual machine, and you store those devices on a datastore that was not

previously a part of the datastore group.

A datastore group consists of the smallest set of datastores required to ensure that if any of a virtual

machine's files is stored on a datastore in the group, all of the virtual machine's files are stored on datastores

that are part of the same group. For example, if a virtual machine has disks on two different datastores, then

Site Recovery Manager combines both datastores into a datastore group. Site Recovery Manager combines

devices into datastore groups according to set criteria.

Two different datastores contain files that belong to the same virtual machine.

Datastores that belong to two virtual machines share a raw disk mapping (RDM) device on a SAN

array, as in the case of a Microsoft cluster server (MSCS) cluster.

Two datastores span extents corresponding to different partitions of the same device.

A single datastore spans two extents corresponding to partitions of two different devices. The two

extents must be in a single consistency group and the SRA must report consistency group information

from the array in the device discovery stage. Otherwise, the creation of protection groups based on this

datastore is not possible even though the SRA reports that the extents that make up this datastore are

replicated.

Multiple datastores belong to a consistency group. A consistency group is a collection of replicated

datastores where every state of the target set of datastores existed at a specific time as the state of the

source set of datastores. Informally, the datastores are replicated together such that when recovery

happens using those datastores, software accessing the targets does not see the data in a state that the

software is not prepared to deal with.

Protecting Virtual Machines on VMFS Datastores that Span Multiple LUNs or

Extents

Not all SRAs report consistency group information from the storage array, because not all storage arrays

support consistency groups. If an SRA reports consistency group information from the array following a

datastore discovery command, the LUNs that constitute a multi-extent VMFS datastore must be in the same

storage array consistency group. If the array does not support consistency groups and the SRA does not

report any consistency group information, Site Recovery Manager cannot protect virtual machines located

on the multi-extent datastore.

Chapter 3 Creating and Managing Protection Groups

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