How Do I Determine a Proper Bandwidth for a Remote Replication or an Inter-Device LUN Copy?

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Bandwidth refers to the amount of data that can be transferred over a channel per unit time, typically expressed in bit/s. The bandwidth of a computer network refers to the maximum data rate on the network, namely, the number of bits transferred per second. Set a bandwidth according to the following rules:
? The bandwidth must meet actual service needs and cannot be greater than the actual network bandwidth.
? If the current service load is heavy, you can decrease the bandwidth for a remote replication or an inter-device LUN copy based on actual needs. Otherwise, existing services are adversely affected.

Other related questions:
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.

Average bandwidth of V3 remote replication
For the two links of asynchronous remote replication, one is the service link connecting the server and primary storage and the other is the replication link connecting the primary storage to the secondary storage. You need to consider average bandwidth and ensure that the average bandwidth of service links must be smaller than the average bandwidth of replication links. Otherwise, if data delivery is faster than data replication, data will be overstocked, resulting in remote replication interruption.

What Is the Usage of the Secondary LUN of 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. ? In normal cases, the secondary LUN of a remote replication cannot be accessed by hosts. Therefore, if a host needs to access a secondary LUN, you can create a snapshot for the secondary LUN and map the snapshot to the host for access. ? In the event that a primary LUN failed, which leads to service interruption, you must perform a primary/secondary switchover to switch the secondary LUN to the primary LUN and then map the new primary LUN to the host for data access.

Configuring remote replication for V3 series unified storage systems
See the configuration procedure in Remote Replication Feature Guide for Block, which is available at http://support.huawei.com/enterprise/docinforeader.action?contentId=DOC1000084218&idAbsPath=7919749|7941815|21430818|21462748|21041235.

What is the principle of setting bandwidth for remote replication and LUN copy among storage arrays?
The bandwidth refers to the amount of data that is transferred on a channel in a certain period of time. Its common unit is bit per second (bps). The bandwidth of a computer network refers to the maximum data rate on the network, namely, the number of bits transferred per second. When setting the bandwidth, note the following: ? The bandwidth should be set to meet the requirements of actual services. You can customize a proper bandwidth as required. ? The bandwidth should be set no larger than the current bandwidth of customers' network. If the workload in the system is heavy, the bandwidth for remote replication and LUN copy among storage arrays can be correspondingly reduced to guarantee the normal running of ongoing services.

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