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TROUBLESHOOTING - Oracle ASM disk not found/visible/discovered issues

APPLIES TO:
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
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Oracle ASM ORA-15063 / ORA-15042 - TROUBLESHOOTING STEPS BEFORE OPENING a SR to Oracle Support

APPLIES TO:
Oracle Database - Enterprise Edition
Oracle Database Cloud Schema Service - Version N/A and later
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Oracle ASM disk group is not mounted on second node|| showing corruption

Hello Experts,
 
 
Envirionment :
OS: RHEL 5.6
Oracle :11.2.0.3 + PSU 5
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Oracle ASM KFED Reports “KFBTYP_INVALID” & OS Metadata [LVM2 001] In "/dev/<DISK #1>" Disk /ASM disk Member (ASM Disk Overlapping : Scenario #2).

APPLIES TO:
Oracle Database Exadata Express Cloud Service - Version N/A and later
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KFED Reports “KFBTYP_INVALID” & OS Metadata [EFI PART] In Oracle ASMLIB Disk /ASM disk Member (ASM Disk Overlapping : Scenario #1).

APPLIES TO:
Oracle Database - Enterprise Edition - Version 10.2.0.1 to 12.1.0.1 [Release 10.2 to 12.1]
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Generic check for error Oracle ASM ORA-15042

Error ORA-15042 means asm cannot mount the diskgroup as some of it member disks are not visible to asm.
 
 
 
How to find which disk is missing:
 
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Is it possible to access the oracle asm diskgroup if the underline disk partition table is corrupted

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Oracle Database Block Corruption in ASM

we got Block corruption in the database and found the following alert log entry during that time.
 
we need to find why block corruption occur. what is the culprit OS/Storage/DB ?
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ASM disk header corruption

 Calling all ASM experts - we have the problem described in note     1487443.1     . I have a simple question, as follows:
   
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what's the reason for Oracle ASM ORA-15196 if no OS/storage issues

we met several times ORA-15196 without any reason.
 
1) no error in OS message
 
2) no error on storage
 
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