Administrator's Guide Supporting RSA Data Protection Manager (DPM) Environments (Supporting Fabric OS v7.2.0) Owner's manual

Fabric OS Encryption Administrator’s Guide (DPM) 71
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Adding target disk LUNs for encryption
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Configuring storage arrays
The Storage Array contains a list of storage ports that will be used later in the LUN centric view. You
must assign storage ports from the same storage array for multi-path I/O purposes. On the LUN
centric view, storage ports in the same storage array are used to get the associated CryptoTarget
containers and initiators from the database. Storage ports that are not assigned to any storage
array but are within the fabrics of the encryption group will be listed as a single target port on the
LUN centric view. Storage Arrays are configured using the Storage Port Mapping dialog box. You will
need to:
1. Configure target and zone initiator ports in the same zone in order for the target container to
come online and discover LUNs in the storage system.
2. Create CryptoTarget containers for each target port in the storage array from the Target
Container dialog box. Add initiator ports to the container. You must create target containers for
those target ports in the configured storage arrays or unassigned target ports before mapping
any LUN on the LUN centric view. If you do not create the container, LUN discovery will not
function.
NOTE
The controller LUN (LUN 0) must be added to the container as clear text in order for the host to see
the LUNs in the container.
For more detailed information on creating a crypto target container, refer to the chapter describing
storage arrays in this administrator’s guide.
Remote replication LUNs
The Symmetrix Remote Data Facility (SRDF) transmits data that is being written to both a local
Symmetrix array and a remote symmetrix array. The replicated data facilitates a fast switchover to
the remote site for data recovery.
SRDF supports the following methods of data replication:
• Synchronous Replication provides real-time mirroring of data between the source Symmetrix
and the target Symmetrix systems. Data is written simultaneously to the cache of both systems
in real time before the application I/O is completed, thus ensuring the highest possible data
availability.
• Semi-Synchronous Replication writes data to the source system, completes the I/O, then
synchronizes the data with the target system. Since the I/O is completed prior to synchronizing
data with the target system, this method provides an added performance advantage. A second
write will not be accepted on a Symmetrix source device until its target device has been
synchronized.
• Adaptive Copy Replication transfers data from the source devices to the remote devices
without waiting for an acknowledgment. This is especially useful when transferring large
amounts of data during data center migrations, consolidations, and in data mobility
environments.
• Asynchronous Replication places host writes into chunks and then transfers an entire chunk to
the target system. When a complete chunk is received on the target system, the copy cycle is
committed. If the SRDF links are lost during data transfer, any partial chunk is discarded,
preserving consistency on the target system. This method provides a consistent point-in-time
remote image that is not far behind the source system and results in minimal data loss if there
is a disaster at the source site.