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Configuration: Premium Feature— Remote Replication 177
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Configuration: Premium Feature—
Remote Replication
The Remote Replication premium feature enables real-time replication of data
between two storage arrays in separate locations. Using remote replication, up
to 16 replicated virtual disk pairs can be created on a storage array.
A replicated virtual disk pair is created from two standard virtual disks, both
of which are logical data storage structures created on a storage array. A
standard virtual disk can only be a member of one replicated pair. A pair
consists of a primary virtual disk at a local storage array and a secondary
virtual disk at a remote storage array. Data written by the host to the primary
virtual disk is replicated directly from the primary storage array to the
secondary virtual disk. No host server or application resources are used during
replication. The data can be written either synchronously or asynchronously.
In the event of a disaster, loss of communications or catastrophic failure in
the local storage array, the secondary virtual disk in the remote storage array
can be promoted to the role of primary virtual disk and assume responsibility
for maintaining business operations.
For detailed steps on creating virtual disks and implementing remote
replication, see "Setting Up and Managing Remote Replication" on page 183.
Switchable Host Access Configuration Required With Remote
Replication
Access to the host server from the local and/or remote storage arrays using
remote replication must be established through a supported Fibre Channel
switch configuration. Direct-attached configurations between the host server
and Dell PowerVault MD storage arrays are not supported.
For more information on configuring the switch environment, see "Required
Switch Zoning Configurations" on page 182.
book.book Page 177 Wednesday, June 8, 2011 5:01 PM