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/oracleasm scandisks
$> /etc/init.d/oracleasm listdisks
$> /etc/init.d/oracleasm querydisk <each disk from previous output>
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 <disk name>
$> dd if=<raw/partition file in question> of=/dev/null count=100 bs=8192
Example:
$> dd if=/dev/raw/raw1 of=/dev/null count=100 bs=8192 # raw device
$> dd if=/dev/oracleasm/disks/PRODA07 of=/dev/null count=100 bs=8192 # ASMLIB device
3) Create a new temporary diskgroup:
SQL> CREATE DISKGROUP TEST EXTERNAL REDUNDANCY DISK '<YOUR CANDIDATE DISK>';
4) Check if the diskgroup is created and mounted:
SQL> SELECT STATE, NAME FROM V$ASM_DISKGROUP;
5) If so, then manually mount it on the other ASM instance(s):
SQL> ALTER DISKGROUP TEST MOUNT;
SQL> SELECT STATE, NAME FROM V$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> alter diskgroup test dismount; --(from all the ASM instances, except from one).
SQL> DROP DISKGROUP TEST; --(from the ASM instance, which the diskgroup is still mounted).
7) Then the candidate disk is ready to be added to the desired diskgroup:
SQL> ALTER DISKGROUP <my production diskgroup> ADD DISK '<your candidate disk>';
References
NOTE:288002.1 - OERR: ORA-15075 disk(s) are not visible cluster-wide
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