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KFED Reports “KFBTYP_INVALID” & OS Metadata [EFI PART] In Oracle ASMLIB Disk /ASM disk Member (ASM Disk Overlapping : Scenario #1).

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]
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Backup Service - Version N/A and later
Information in this document applies to any platform.
SYMPTOMS
1) ASM diskgroup cannot be mounted due to the next error:
 
SQL> alter diskgroup reco mount;
alter diskgroup reco mount
*
ERROR at line 1:
ORA-15032: not all alterations performed
ORA-15040: diskgroup is incomplete
ORA-15042: ASM disk "2" is missing from group number "2"
 
 
 
CAUSE
1) Kfed reports:
 
[oracle@fcomtaep2 disks]$ kfed read ASMRECO03
kfbh.endian: 0 ; 0x000: 0x00
kfbh.hard: 0 ; 0x001: 0x00
kfbh.type: 0 ; 0x002: KFBTYP_INVALID
kfbh.datfmt: 0 ; 0x003: 0x00
kfbh.block.blk: 0 ; 0x004: blk=0
kfbh.block.obj: 0 ; 0x008: file=0
kfbh.check: 0 ; 0x00c: 0x00000000
kfbh.fcn.base: 0 ; 0x010: 0x00000000
kfbh.fcn.wrap: 0 ; 0x014: 0x00000000
kfbh.spare1: 0 ; 0x018: 0x00000000
kfbh.spare2: 0 ; 0x01c: 0x00000000
7FC18D899400 00000000 00000000 00000000 00000000 [................]
  Repeat 27 times
7FC18D8995C0 FEEE0001 0001FFFF FFFF0000 00000FFF [................]
7FC18D8995D0 00000000 00000000 00000000 00000000 [................]
  Repeat 1 times
7FC18D8995F0 00000000 00000000 00000000 AA550000 [..............U.]
7FC18D899600 20494645 54524150 00010000 0000005C [EFI PART....\...]
7FC18D899610 BD82BBB3 00000000 00000001 00000000 [................]
7FC18D899620 0FFFFFFF 00000000 00000022 00000000 [........".......]
7FC18D899630 0FFFFFDE 00000000 FD8857E5 42D7B49B [.........W.....B]
7FC18D899640 0901FA87 6B3DB5AA 00000002 00000000 [......=k........]
7FC18D899650 00000080 00000080 FE48EB77 00000000 [........w.H.....]
7FC18D899660 00000000 00000000 00000000 00000000 [................]
  Repeat 25 times
7FC18D899800 EBD0A0A2 4433B9E5 B668C087 C79926B7 [......3D..h..&..]
7FC18D899810 5381F6DF 4626F988 0E4F468D D78D3B28 [...S..&F.FO.(;..]
7FC18D899820 000007A1 00000000 0FFFF85F 00000000 [........_.......]
7FC18D899830 00000000 00000000 00720070 006D0069 [........p.r.i.m.]
7FC18D899840 00720061 00000079 00000000 00000000 [a.r.y...........]
7FC18D899850 00000000 00000000 00000000 00000000 [................]
 Repeat 186 times
KFED-00322: Invalid content encountered during block traversal: [kfbtTraverseBlock][Invalid OSM block type][][0
 
2) Above, kfed is reporting that the “ASMRECO03” disk was overlapped by the OS, it shows “EFI PART” which is OS partition metadata:
 
7FC18D899600 20494645 54524150 00010000 0000005C [EFI PART....\...]
 
3) The underlying disks associated to the “ASMRECO03” ASMLIB disk was reformatted by root and assigned to the OS filesystem.
 
4) This action corrupted/destroyed the RECO diskgroup for sure.
 
 
 
 
SOLUTION
Diskgroup needs to be recreated due to the “ASMRECO03” disk was overlapped by the OS filesystem.