Does Implementation of Remote Replication Require the Use of UltraAPM?

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Remote replication is independent of UltraAPM. Therefore, remote replication can be implemented without installing UltraAPM.

Other related questions:
Whether the Dorado series remote replication feature requires licenses
Remote replication is an optional value-added feature. You need to purchase licenses for both primary and secondary storage systems to use the feature.

Whether Host Agent is required for remote replication
Whether Host Agent is required for remote replication: The remote replication function does not depend on Host Agent. Therefore, to enable the remote replication function, you do not need to install Host Agent.

How to use a secondary LUN in a remote replication?
In a remote replication, the secondary LUN and the primary LUN form a pair, and the secondary LUN backs up data on the primary LUN. ? By default, the secondary LUN cannot be accessed (read or written) by a host. If a request is made to access data on the secondary LUN, you can create a virtual snapshot for the secondary LUN, and then map the virtual snapshot to the host for access. ? When a primary LUN encounters a critical error and the services are interrupted, you must perform the master/slave switchover to switch the secondary LUN to the primary LUN, and then map the new primary LUN to the host for access. NOTE: For details on how to perform a master/slave switchover, choose Help > Help Topics on the ISM, and view the related help information.

What Is the Difference Between Synchronous Remote Replication and Asynchronous Remote Replication
Both synchronous remote replication and asynchronous remote replication can be used in disaster recovery solutions implemented by storage systems to back up data remotely. However, they are implemented in different ways and applicable to different service scenarios. Implementation modes are describes as follows: ? Synchronous remote replication: When a host writes data to the primary LUN, a write request is also sent to the secondary LUN. After both LUNs return a response indicating a successful I/O write, the primary storage system sends the host a response indicating a successful I/O write, implementing real-time data synchronization between the primary LUN and the secondary LUN. ? Asynchronous remote replication: When writing data to the primary LUN, the primary storage system records the changed data. After the primary LUN returns a response indicating a successful write, the primary storage system sends the host a response indicating a successful write. Then, data synchronization is triggered by a user manually or by the system based on user-defined trigger conditions to ensure data consistency between the primary LUN and the secondary LUN. Service scenarios are described as follows: ? Synchronous remote replication requires high bandwidth and low data latency. Therefore, synchronous remote replication is typically used in disaster recovery scenarios where the primary and secondary storage systems are adjacent to each other, such as the intra-city data backup and disaster recovery scenario. ? Asynchronous remote replication is not demanding on bandwidth and data latency. Therefore, asynchronous remote replication is applicable to disaster recovery scenarios where the primary and secondary storage systems are far away from each other or the network bandwidth is limited.

Specifications of S5600T remote replication
Specifications of S5600T V100R005 remote replication are as follows: -Maximum number of asynchronous remote replication groups: 256 (each primary LUN has a maximum of one secondary LUN.) -Maximum number of synchronous remote replication groups: 512 (each primary LUN has a maximum of two secondary LUNs and the secondary LUNs belong to different arrays) -Maximum number of remote replication consistency groups: 16 -Maximum number of pairs in a remote replication consistency group: 8 -Maximum capacity of synchronous remote replication: 476 TB -Default maximum capacity of asynchronous remote replication: 29 TB -Maximum number of connected remote disk arrays: 32 The specifications vary with the product version. For the latest specifications, see Software Specifications.

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