How To Add a New Disk(s) to An Existing Diskgroup on RAC (Best Practices).

Before you add the disk(s) to your production diskgroup, you can use the next steps to validate whether the candidate disk(s) is/are in good shape and can be accessed from each node (without harm the existing production diskgroups), as follow:

Solution

1) As Oracle OS user, run the next commands on each node (if ASMLIB API is used):

$>id
$>/etc/init.d/oracleasmscandisks
$>/etc/init.d/oracleasmlistdisks
$>/etc/init.d/oracleasmquerydisk<eachdiskfrompreviousoutput>

Note: All the disks must be visible from each node.

2) Confirm the disks are visible (I/O) at OS level (as Oracle OS user) from each node:

$>id
$>ls-l<diskname>
$>ddif=<raw/partitionfileinquestion>of=/dev/nullcount=100bs=8192

Example:

$>ddif=/dev/raw/raw1of=/dev/nullcount=100bs=8192#rawdevice
$>ddif=/dev/oracleasm/disks/PRODA07of=/dev/nullcount=100bs=8192#ASMLIBdevice

3) Create a new temporary diskgroup:

SQL>CREATEDISKGROUPTESTEXTERNALREDUNDANCYDISK'<YOURCANDIDATEDISK>';

4) Check if the diskgroup is created and mounted:

SQL>SELECTSTATE,NAMEFROMV$ASM_DISKGROUP;

5) If so, then manually mount it on the other ASM instance(s):

SQL>ALTERDISKGROUPTESTMOUNT;
SQL>SELECTSTATE,NAMEFROMV$ASM_DISKGROUP;

6 If the previous steps had success and the TEST diskgroup can be successfully mounted (on each ASM instance), then drop the TEST diskgroup as follow:

SQL>alterdiskgrouptestdismount;--(fromalltheASMinstances,exceptfromone).

SQL>DROPDISKGROUPTEST;--(fromtheASMinstance,whichthediskgroupisstillmounted).

7) Then the candidate disk is ready to be added to the desired diskgroup:

SQL>ALTERDISKGROUP<myproductiondiskgroup>ADDDISK'<yourcandidatedisk>';

References

NOTE:288002.1 - OERR: ORA-15075 disk(s) are not visible cluster-wide

From Oracle

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