How to Attach a Submirror

If you see an error message stating can't attach labeled submirror to an unlabeled mirror, that indicates that you unsuccessfully attempted to attach a RAID 0 volume to a mirror. A labeled volume (submirror) is a volume whose first component starts at cylinder 0, while an unlabeled volume's first component starts at cylinder 1. To prevent the labeled submirror's label from being corrupted, Solaris Volume Manager does not allow labeled submirrors to be attached to unlabeled mirrors.

Steps

1. Identify the component (concatenation or stripe) to be used as a submirror.

   It must be the same size (or larger) as the existing submirror in the mirror. If you have not yet created a volume to be a submirror, see Creating RAID 0 (Stripe) Volumes or Creating RAID 0 (Concatenation) Volumes.

2. Make sure that you have root privilege and that you have a current backup of all data.

3. Use one of the following methods to attach a submirror.

   • From the Enhanced Storage tool within the Solaris Management Console, open the Volumes node, choose the mirror, then choose Action->Properties and click the Submirrors tab. Follow the instructions on screen. For more information, see the online help.

   • Use the metattach mirror submirror command.

     # metattach mirror submirror

   See the metattach(1M) man page for more information.

Example 11–7 Attaching a Submirror

# metastat d30
d30: mirror
    Submirror 0: d60
      State: Okay   
...
# metattach d30 d70
d30: submirror d70 is attached
# metastat d30
d30: mirror
    Submirror 0: d60
      State: Okay        
    Submirror 1: d70
      State: Resyncing
    Resync in progress: 41 % done
    Pass: 1
    Read option: roundrobin (default)
    Write option: parallel (default)
    Size: 2006130 blocks
...

This example shows the attaching of a submirror, d70, to a one-way mirror, d30, creating a two-way mirror. The mirror d30 initially consists of submirror d60. The submirror d70 is a RAID 0 volume. You verify that the status of the mirror is “Okay” with the metastat command, then attach the submirror. When the metattach command is run, the new submirror is resynchronized with the existing mirror. When you attach an additional submirror to the mirror, the system displays a message. To verify that the mirror is resynchronizing, use the metastat command.