Add a mirror to a volume


Add a mirror to a volume
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The basic process of adding a mirror is described in this section.

The Add Mirror wizard also enables you to implement the Dynamic Relayout feature.

If you create more than one mirror at a time, you may see inconsistent information on the progress bar. Also, the generation of multiple mirrors does affect system resources. After creating a mirror, you may want to wait until it has finished generating before creating another mirror.

Warning:

Adding mirrors to a volume involves a certain amount of time for mirror resynchronization. Take care not to perform actions on the volume until the command is complete. Also, if you inadvertently shut down the server or deport the disk group containing the volume before mirror resynchronization completes, any mirrors that are in the process of being added to the volume are deleted when the disk group with the volume comes online again.

Note that the SmartMove feature can help reduce mirror resynchronization time.

To add a mirror to a volume

Right-click on the volume you want to mirror.
Select Mirror>Add from the context menu.
The Add Mirror wizard appears.
Specify how many mirrors you want to add to the volume, and, if desired, manually assign the destination disks for the mirrors.
To assign the disks manually, click the Manually select disks radio button. Then use the buttons for adding and removing disks to move the disks you want assigned as destination disks to the right pane of the window.

You may also check Disable Track Alignment to disable track alignment for the mirrors.

Click Next to continue.
In the Specify the attributes dialog box, select the Concatenated or Striped volume layout type. If you create a striped mirror, the Columns and Stripe unit size boxes need to have entries. Defaults are provided.
You may also specify a mirror that mirrors across disks with the following attributes:
- Connected by port
- Identified by target
- Contained in an enclosure
- Connected by channel
In addition for a striped layout, you may specify to have the stripe across disks done by the following:
- Port
- Target
- Enclosure
- Channel
Click Next to continue.

The operation to create a new dynamic volume fails if the appropriate resources are not available to support the selected attributes to mirror across disks.
On the summary page, click Finish to add the mirror.