Dell PowerVault MD 32XX/36XX Series Storage Arrays CLI Guide

Set Remote Replication

Description

NOTE: This command is valid only with Fibre Channel storage arrays.

This command defines the properties for a remote replication pair.

NOTE: Starting with firmware 8.10, some RAID controller modules no longer support the writeOrder parameter and the writeMode parameter.

Syntax

set remoteReplication (localVirtualDisk [virtualDiskName] | 
                                 localVirtualDisks [virtualDiskName1 ... virtualDiskNameN]) 
                                 [role=(primary | secondary)] 
                                 [syncPriority=(highest | high | medium | low | lowest)] 
                                 [autoResync=(enabled | disabled)] 
                                 [writeOrder=(preserved | notPreserved)] 
                                 [writeMode=(synchronous | asynchronous)] [force=(TRUE | FALSE)]

Parameters

Parameter	Description
localVirtualDisk	The name local virtual disk for which you want to define properties. Enclose the primary virtual disk name in square brackets ([ ]). If the primary virtual disk name has special characters or numbers, you must enclose the primary virtual disk name in double quotation marks (" ") inside square brackets.
localVirtualDisks	The names of several local virtual disks for which you want to define properties. Enter the names virtual disks using these rules: Enclose all names in square brackets ([ ]). Separate each names with a space. If the virtual disk names have special characters or consist only of numbers, enter the names using these rules: Enclose all names in square brackets ([ ]). Enclose each names in double quotation marks (" "). Separate each names with a space.
role	The setting for the local virtual disk to act as the primary virtual disk or the secondary virtual disk. To define the virtual disk as the primary virtual disk, set this parameter to `primary` . To define the virtual disk as the secondary virtual disk, set this parameter to `secondary` . This parameter applies only when the virtual disk is part of a replication relationship.
syncPriority	The priority that full synchronization has relative to host I/O activity. Valid values are `highest` , `high` , `medium` , `low` , or `lowest` .
autoResync	The settings for automatic `resynchronization` between the primary virtual disks and the secondary virtual disks of a remote-replicated pair. This parameter has these values: `enabled` – Automatic `resynchronization` is turned on. You do not need to do anything further to `resynchronize` the primary virtual disk and the secondary virtual disk. `disabled` – Automatic `resynchronization` is turned off. To `resynchronize` the primary virtual disks and the secondary virtual disk, you must run the `resume` `remoteReplication` command.
writeOrder	This parameter defines write order for data transmission between the primary virtual disk and the secondary virtual disk. Valid values are `preserved` or `notPreserved` .
writeMode	This parameter defines how the primary virtual disk writes to the secondary virtual disk. Valid values are `synchronous` or `asynchronous` .
force	The role reversal is forced if the communications link between the storage arrays is down and promotion or demotion on the local side results in a dual-primary condition or a dual-secondary condition. To force a role reversal, set this parameter to `TRUE` . The default value is `FALSE` . NOTE: Use the force parameter only when using the role parameter.

Notes

When you use this command, you can specify one or more optional parameters.

Synchronization priority defines the amount of system resources that are used to synchronize the data between the primary virtual disks and the secondary virtual disks of a replication relationship. If you select the highest priority level, the data synchronization uses the most system resources to perform the full synchronization, which decreases the performance for host data transfers.

The writeOrder parameter applies only to asynchronous write modes and makes them become part of a consistency group. Setting the writeOrder parameter to preserved causes the remote-replicated pair to transmit data from the primary virtual disk to the secondary virtual disk in the same order as the host writes to the primary virtual disk. In the event of a transmission link failure, the data is buffered until a full synchronization can occur. This action can require additional system overhead to maintain the buffered data, which slows operations. Setting the writeOrder parameter to notPreserved frees the system from having to maintain data in a buffer, but it requires forcing a full synchronization to make sure that the secondary virtual disk has the same data as the primary virtual disk.

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