Set synchronous mirroring
The set syncMirror command defines the properties for a remote-mirrored pair.
Supported Arrays
This command applies to an individual DE2000H, DE4000H, DE4000F, DE6000H, or DE6000F storage array.
Roles
To execute this command on an storage array, you must have the Storage Admin role.
Syntax
set syncMirror (localVolume [<var id="GUID-D4C90C41-CC1B-45CF-AADE-2D285C51662A__V1273827" className="keyword varname">volumeName</var>] |
localVolumes [<var id="GUID-D4C90C41-CC1B-45CF-AADE-2D285C51662A__V1273828" className="keyword varname">volumeName1</var> ... <var id="GUID-D4C90C41-CC1B-45CF-AADE-2D285C51662A__V1273829" className="keyword varname">volumeNameN</var>])
[role=(primary | secondary)]
[syncPriority=(highest | high | medium | low | lowest)]
[autoResync=(enabled | disabled)]
[writeOrder=(preserved | notPreserved)]
[writeMode=(synchronous | asynchronous)]
[force=(TRUE | FALSE)]
Parameters
| Parameter | Description |
|---|---|
| localVolume | The name of the local volume for which you want to define properties. Enclose the primary volume name in square brackets ([ ]). If the primary volume name has special characters or numbers, you must enclose the primary volume name in double quotation marks (" ") inside square brackets. |
| localVolumes | The names of several local volumes for which you want to define properties. Enter the names of the volumes using these rules:
If the volume names have special characters or consist only of numbers, enter the names using these rules:
|
| role | The setting for the local volume to act as the primary volume or the secondary volume. To define the volume as the primary volume, set this parameter to primary . To define the volume as the secondary volume, set this parameter to secondary . This parameter applies only when the volume is part of a mirror 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 volumes and the secondary volumes of a remote-mirrored pair. This parameter has these values:
|
| writeOrder | This parameter defines write order for data transmission between the primary volume and the secondary volume. Valid values are preserved or notPreserved . |
| writeMode | This parameter defines how the primary volume writes to the secondary volume. 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 |
Notes
When you use this command, you can specify one or more of the optional parameters.
Synchronization priority defines the amount of system resources that are used to synchronize the data between the primary volumes and the secondary volumes of a mirror 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-mirrored pair to transmit data from the primary volume to the secondary volume in the same order as the host writes to the primary volume. 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 volume has the same data as the primary volume.