Oracle 11gR2 ASM issue

Question

Environment: HP-UX / Oracle 11gR2 RAC with ASM
We renamed our ASM disk from c5t1d3 to ora_c5t1d3 in UNIX, and now we want to remove the old name c5t1d3, before that we want to change the disk on ASM diskgroup from c5t1d3 to ora_c5t1d3.
I dropped the disk c5t1d3 and try to add the same disk with different name ora_c5t1d3, but I am not able to add, I am getting the following error
SQL> alter diskgroup asmcrsdg1 add disk '/dev/rdsk/ora_c5t1d3';
alter diskgroup asmcrsdg1 add disk '/dev/rdsk/ora_c5t1d3'
ERROR at line 1:
ORA-15032: not all alterations performed
ORA-15020: discovered duplicate ASM disk "ASMCRSDG1_0006"
But this disk is not there, when I try to drop this disk, I am getting the following error,
SQL> alter diskgroup asmcrsdg1 drop disk ASMCRSDG1_0006;
alter diskgroup asmcrsdg1 drop disk ASMCRSDG1_0006
ERROR at line 1:
ORA-15032: not all alterations performed
ORA-15054: disk "ASMCRSDG1_0006" does not exist in diskgroup "ASMCRSDG1"
I am confused, Can anyone please help me to understand what’s going on here.

Answer 1

Check if ASM disk is still a part of ASM disk group.
1.
Query header_status and mount_status columns in V$ASM_DISK
2.
# dd if=/dev/rdsk/c5t1d3 of=/tmp/disk.out bs=8192 count=1000
# vi /tmp/disk.out
If the disk is still a part of the diskgroup, then clean up ASM disk header.
# dd if=/dev/null of=/dev/rdsk/c5t1d3 bs=8192 count=1000
Add a renamed disk again.