You want to change the redundancy of the Disk Group of the ASM instance.
Current situation:
If you try to dismount/drop:
Why?
Because the ASM instance has its spfile on it:
[grid@ora-asm:+ASM ~]$ asmcmd ASMCMD> spget +DATA/asm/asmparameterfile/registry.253.907250463 |
How to procede then
Firts, you need to add another diskgroup (VOL3):
[root@ora-asm ~]# oracleasm createdisk VOL3 /dev/sdd1 Writing disk header: done Instantiating disk: done [root@ora-asm ~]# oracleasm listdisks VOL1 VOL2 VOL3 |
Present the new disk to asm.
Create a new DG, this time with External redundancy:
asmca |
Now we have to move the parameter file from +DATA to +DG_GRID.
Create a pfile from spfile, and shutdown the asm instance:
SQL> create pfile='/tmp/init+ASM.ora' from spfile;
File created.
SQL> shut immediate; ASM diskgroups dismounted ASM instance shutdown |
Start from pfile:
SQL> startup pfile='/tmp/init+ASM.ora'; ASM instance started
Total System Global Area 1135747072 bytes Fixed Size 2260728 bytes Variable Size 1108320520 bytes ASM Cache 25165824 bytes ASM diskgroups mounted SQL> show parameter spfile
NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ spfile string |
There is no spfile configured.
Now, all we have to do is to create a new spfile in the new location DG_GRID:
SQL> create spfile='+DG_GRID/init.ora' from pfile='/tmp/init+ASM.ora';
File created. |
Shutdown and start the instance again, and you can see the spfile created in the new location:
SQL> shut immediate; ASM diskgroups dismounted ASM instance shutdown SQL> startup ASM instance started
Total System Global Area 1135747072 bytes Fixed Size 2260728 bytes Variable Size 1108320520 bytes ASM Cache 25165824 bytes ASM diskgroups mounted SQL> show parameter spfile
NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ spfile string +DG_GRID/init.ora |
Now, delete (dismount and drop) the old dg DATA, and thats it, you have changed the redundancy of your DG.
asmca |
Regards,
Richard W. L. Brehmer