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Solaris: metastat "need maintenance" state on a SAN

After a scheduled downtime, one of our Oracle server (SunFire V240) was started slightly before the SAN (Sun StorEdge D280) was fully operational. It resulted in I/O errors and a metastat in "need maintenance" state.
(Please notice I've truncated the output for an easier reading).

# metastat d200 
d200: Mirror
    Submirror 0: d201
      State: Needs maintenance
    Pass: 1
    Read option: roundrobin (default)
    Write option: parallel (default)
    Size: 566198272 blocks (269 GB)

d201: Submirror of d200
    State: Needs maintenance
    Invoke: after replacing "Maintenance" components:
                metareplace d200 /dev/dsk/c3t600A...d0s0 
    Size: 566198272 blocks (269 GB)
    Stripe 0:
        Device                 Start Block  Dbase        State Reloc Hot Spare
        /dev/dsk/c3t600B...d0s0          0     No      Last Erred   Yes
    Stripe 1:
        Device                 Start Block  Dbase        State Reloc Hot Spare
        /dev/dsk/c3t600C...d0s0       8192     No      Last Erred   Yes
#

As you can see, it's a one-side mirror (easier when I need to consolidate multiple LUNs).
The metareplace command did not work:

# metareplace -e d200 /dev/dsk/c3t600A...d0s0 
metareplace: sdmtl114: d200: attempt to replace a component on the last running submirror
#

There are two way to clear the maintenance state: the recommended one, ... and the last chance.
    The recommended way
  1. Do a backup
  2. Add another side to the mirror
  3. When sync'd, drop the "old" side and recreate it
  4. Once sync'd, drop the temporary side.

    The last chance
  1. Do a backup
  2. Drop the mirror: metaclear -f d200
  3. And recreate it: metainit d200 -m d201
  4. The maintance state should now be cleared:

    # metastat d200 
    d200: Mirror
        Submirror 0: d201
          State: Okay
        Pass: 1
        Read option: roundrobin (default)
        Write option: parallel (default)
        Size: 566198272 blocks (269 GB)

    d201: Submirror of d200
        State: Okay
        Size: 566198272 blocks (269 GB)
        Stripe 0:
            Device                 Start Block  Dbase        State Reloc Hot Spare
            /dev/dsk/c3t600B...d0s0          0     No            Okay   Yes
        Stripe 1:
            Device                 Start Block  Dbase        State Reloc Hot Spare
            /dev/dsk/c3t600C...d0s0       8192     No            Okay   Yes
    #


Of course, I'm not responsible if you loose any data. This worked for me, but has no guarantee it will work for you. However, it's rather good to know the trick.
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Comments

Senthil said…
Thanks it worked me too...
19 November 2011 at 19:26
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