How to Attach a Submirror (Command Line)

After checking the prerequisites ("Prerequisites for Maintaining DiskSuite Objects"), and the preliminary information ("Preliminary Information for Mirrors"), use the metattach(1M) command to attach a submirror to a mirror. Refer to the metattach(1M) man page for more information.

Before starting, identify the concatenation or stripe to be used as the submirror. It must be the same size (or larger) as the existing submirror in the mirror. If you have not yet created either, refer "Creating Stripes and Concatenations".

Example -- 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. d70 is a concatenated metadevice. You verify that the status of the mirror is "Okay" with the metastat(1M) command, then attach the submirror. When the metattach(1M) command is run, the new submirror is resynced with the existing mirror. When you attach an additional submirror to the mirror, the system displays a message. To verify that the mirror is resyncing, use the metastat(1M) command.