1 Reply Latest reply on Dec 10, 2009 11:39 AM by 807559

    what's labeled submirror and unlabeled submirror

    807748
      Hi, I'm recently learning on solaris volume manager. I have read this sentences and cannot understand about it.

      *"You can have a mirrored file system in which the first submirror attached does not start on*
      *cylinder 0. All additional submirrors you attach must also not start on cylinder 0. If you attempt*
      *to attach a submirror starting in this situation, the following error message displays:*
      *can’t attach labeled submirror to an unlabeled mirror"*

      I have a several question on it. Can someone explain on it?
      1. What's label submirror, i trying google it but it is not clear definition for it.
      2. Is there any purpose start from cylinder 0?
      3. Is the attached both submirrors required similar cylinder ranges? i.e. if submirror A cylinders range from 0 to 16 then submirror cylinders must be from 0 to 16 also?
        • 1. Re: what's labeled submirror and unlabeled submirror
          807559
          It is to stop the disk label from being overwritten as seen using format or prtvtoc.

          The following is valid....

          example 1
          sub mirror 1
          c0t0d0
          blk 0 -> 99

          attached sub mirror 2
          c0t1d0
          blk 0 -> 99

          Will also work

          sub mirror 1
          c0t0d0
          blk 0 -> 99

          attached sub mirror 2
          c0t1d0
          blk 200 -> 299

          This will fail as the label on c0t1d0 will be overwritten

          submirror 1
          c0t0d0
          blk 300 -> 399

          attached submirror 2
          c0t1d0
          blk 0 -> 99 #### block zero overwritten.