Adding a mirror to a site-based volume through GUI


Adding a mirror to a site-based volume through GUI
Prev	Administering mirrored plexes for site-based allocation	Next

If you want to add a mirrored plex to a disk or storage that is not site tagged, then you should change the volume Sitetype property to Siteless.

In case of a Site Confined volume, mirrors can be added within the same site only, say for example Site1. If you want to add a mirrored plex to a different site, say Site2, then you should change the volume Sitetype property to Site Separated or Siteless.

In case of a Site Separated volume, mirrors can be added to a different site. All volumes that are required for an application to come up must have a complete plex at all the specified sites. Writes are written to the specified sites as done in case of a normal mirrored volume.

Perform the following steps to add a mirror:

To add a mirror for a site-based volume

Right-click 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 required, manually assign the destination disks for the mirrors.

Complete the following on this screen:

Name of the Volume	Default name of the volume to which you want to add a mirror is displayed
Number of mirrors to add	Select the number of mirrors you want to add from this drop-down list.
Select site from	If the volume is site Separated, then this list is displayed. Select sites as per your requirement. Disks are displayed in Available disks as per specified sites. If volume is Siteless, then this list is grayed out and all available disks are displayed for selection. If the volume is Site Confined, then this site selection list is grayed out and disks from the same site as volume are displayed.
Auto select disks	Enable this option, if you want to assign disks automatically.
Manually select disks	Enable this option, if you want to manually assign disks. The volume site type, whether Site Confined or Site Separated, is displayed based on system auto-selection. Select disk or disks from the Available disk list and click Select or Select All respectively.

Click Next.

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.