This article copied from the Sun Managers' Archive

SYNOPSIS: How to move SSA with ODS metadevices to a different host


You are moving a Sparc Storage Array from one host to another. The SSA
Has been configured with Online Disk Suite(ODS).


 These steps are also for moving a SSA to a system that doesn't have an
existing ODS configuration, but has ODS installed on it.

1. Backup all data on the metadevices that are being moved.(hostA)

2. Make sure your configuration is alright by using the below command.(hostA)


3. Make a copy of your configuration with the command below.(hostA)

#metastat -p > /outut_file

4. Find out where the metadb's are.

     flags           first blk       block count
     a m  pc luo        16              1034            /dev/dsk/c0t4d0s0
     a    pc luo        16              1034            /dev/dsk/c0t5d0s0
     a    pc luo        16              1034            /dev/dsk/c0t2d0s0
5. Now we want to clear the metadevices.(you must unmount all the metadevices

#metaclear -ar
d3: Mirror is cleared
d0: Concat/Stripe is cleared
d2: Concat/Stripe is cleared

6. Next we want to remove the metadb's.(hostA)

#metadb -d -f /dev/dsk/cxtxdxsx
   You will need to do the above command for each metadb.

5. Put a copy of the "output_file on tape or transfer the file to hostB via

6. You will need to edit the "output_file" to do the following:

   - reflect the new controller numbers.
   - if there is mirroring in your configuration. You will want to break the two
   way mirrors. (hostB) Remember you want to write down the second side of the
   mirror that we will be breaking off, we will need this for step 14.
   (rebuilding the mirror)
Before editting

d3 -m d0 d2 1
d0 1 1 c0t4d0s6
d2 1 1 c0t5d0s6

After editting

d3 -m  d0
d0 1 1 c0t4d0s6
d2 1 1 c0t5d0s6

   - if you have RAID-5 devices, edit the file and add -k option at
     the end of the RAID-5 metadevice initilization line.
     d8 -r /dev/dsk/c#t#d#s# /dev/dsk/c#t#d#s# /dev/dsk/c#t#d#s0 -i 8k -k
     WARNING: Failure to use -k will cause metadisk to be reinitialized, thus
            losing data! 

7. Bring hostA down and remove the SSA.

8. Now we want install the SSA on hostB.
   a.Bring hostB down & attach the SSA
   b.Do a reconfiguration boot
#boot -r
   c. Verify that you can see the array through format.

9. After moving the file out of the way(first command below)and have a
   copy of the editted "output_file on your system, move the "output_file" to

#mv /etc/opt/SUNWmd/ /etc/opt/SUNWmd/org.mdtab
#mv /output_file /etc/opt/SUNWmd/

10. First we will need to create are meta state databases. Using the example
    output from step 4. in the below commands.

#metadb -a /dev/dsk/c0t4d0s0
     #Metadb -a /dev/dsk/c0t5d0s0
    #metadb -a /dev/dsk/c0t2d0s0

11. Now that we have a configured file and metadb's we can rebuild the
    meta devices.

#metainit -a

12. run metastat to see that the metadevice were set up correctly and in the
    ok state.

13. Before we can reattach the mirrors we need to reboot


14. Once up and running on the one sided mirrors we can reattach the other side.
    Again we will be using the example data from step six.

#metattach d3 d2
    You will need to do the above command for each mirror. Remember After attach-
    ing the sub back to the mirror it will be syncing, SO DO NOT REBOOT, until
    they are done. You can use the below command to get a status on the meta-

14. After the drives sync you are done.