Technical data

Fabric OS Encryption Administrator’s Guide (DPM) 71

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Adding target disk LUNs for encryption

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.