Dell PowerVault MD 34XX/38XX Series Storage Arrays CLI Guide

Create Remote Replication

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

Description

This command creates both the primary virtual disk and the secondary virtual disk for a remote replication pair. This command also sets the write mode (Synchronous or Asynchronous) and the synchronization priority.

Syntax

create remoteReplication primary=
                                 ”
                                 primaryVirtualDiskName”
                                 secondary=”
                                 secondaryVirtualDiskName”
                                 (remoteStorageArrayName=”
                                 storageArrayName” |
                                 remoteStorageArrayWwn=”
                                 wwID”)
                                 [remotePassword=”
                                 password”
                                 syncPriority=(highest | high | medium | low |
                                 lowest)
                                 autoResync=(enabled | disabled)
                                 writeOrder=(preserved | notPreserved)
                                 writeMode=(synchronous | asynchronous)]

Parameters

Parameter	Description
`primary`	The name of an existing virtual disk on the local storage array that you want to use for the primary virtual disk. Enclose the primary virtual disk name in double quotation marks (“ ”).
`secondary`	The name of an existing virtual disk on the remote storage array that you want to use for the secondary virtual disk. Enclose the secondary virtual disk name in double quotation marks (“ ”).
`remoteStorageArrayName`	The name of the remote storage array. Enclose the remote storage array name in double quotation marks (“ ”).
`remoteStorageArrayWwn`	The World Wide Identifier (WWID) of the remote storage array. Enclose the WWID in double quotation marks (“ ”).
`remotePassword`	The password for the remote storage array. Use this parameter when the remote storage array is password protected. Enclose the password in double quotation marks (“ ”).
`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 replication 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 disk and the secondary virtual disk, you must run the `start asyncReplicationGroup` command.
`writeOrder`	The write order for data transmission between the primary virtual disk and the secondary virtual disk. Valid values are `preserved` or `notPreserved`.
`writeMode`	How the primary virtual disk writes to the secondary virtual disk. Valid values are `synchronous` or `asynchronous`.

Notes

Names can be any combination of alphanumeric characters, hyphens, and underscores. Names can have a maximum of 30 characters.

When the primary virtual disk and the secondary virtual disk are chosen, the secondary virtual disk must be of equal or of a greater size than the primary virtual disk. The RAID level of the secondary virtual disk does not have to be the same as that of the primary virtual disk.

Passwords are stored on each storage array in a management domain. If a password was not previously set, a password is not needed. The password can be any combination of alphanumeric characters with a maximum of 30 characters. (A storage array password can be defined by using the set storageArray command.)

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

The writeOrder parameter applies only to asynchronous replications and makes them become part of a consistency group. Setting the writeOrder parameter to preserved causes the remote replication 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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