Wipe out and reuse ASM disk header !

Grid installation fails due to issues to execute root.sh scripts on both nodes

It is always a challenge,if the installation get failed at half of progress and there is no other option that we have to reinstall grid because of ignorance of failed prerequisites

[root@rac1 grid]# /apps01/home/12.1.0/grid/bin/kfod status=TRUE asm_diskstring='/dev/oracleasm/asm*' disks=all dscvgroup=TRUE
--------------------------------------------------------------------------------
ORACLE_SID ORACLE_HOME
================================================================================
     +ASM1 /apps01/home/12.1.0/grid
[root@rac1 grid]# /apps01/home/12.1.0/grid/bin/kfod status=TRUE asm_diskstring='/dev/oracleasm/disks/*' disks=all dscvgroup=TRUE
--------------------------------------------------------------------------------
 Disk          Size Header    Path                                     Disk Group   User     Group
================================================================================
   1:      12284 Mb CANDIDATE /dev/oracleasm/disks/DATA                #            oracle   oinstall
   2:      12284 Mb CANDIDATE /dev/oracleasm/disks/FRA                 #            oracle   oinstall
   3:       6142 Mb MEMBER    /dev/oracleasm/disks/OCR                 OCR          oracle   oinstall
--------------------------------------------------------------------------------
ORACLE_SID ORACLE_HOME
================================================================================
     +ASM1 /apps01/home/12.1.0/grid

Read the disk header to check the validity of the disk

[root@rac1 grid]# /apps01/home/12.1.0/grid/bin/kfed read /dev/oracleasm/disks/OCR AUNUM=0 BLKNUM=0
kfbh.endian:                          1 ; 0x000: 0x01
kfbh.hard:                          130 ; 0x001: 0x82
kfbh.type:                            1 ; 0x002: KFBTYP_DISKHEAD <<<<====

clear the asm disk header using dd

[root@rac1 grid]# dd if=/dev/zero of=/dev/oracleasm/disks/DATA bs=8192 count=128                                                                                                             00
12800+0 records in
12800+0 records out
104857600 bytes (105 MB) copied, 3.36437 s, 31.2 MB/s
[root@rac1 grid]# dd if=/dev/zero of=/dev/oracleasm/disks/FRA bs=8192 count=1280                                                                                                             0
12800+0 records in
12800+0 records out
104857600 bytes (105 MB) copied, 2.39119 s, 43.9 MB/s
[root@rac1 grid]# dd if=/dev/zero of=/dev/oracleasm/disks/OCR bs=8192 count=1280                                                                                                             0
12800+0 records in
12800+0 records out
104857600 bytes (105 MB) copied, 0.0719423 s, 1.5 GB/s

Query the disks if their headers are marked

[root@rac1 grid]# oracleasm querydisk DATA
Disk "DATA" defines an unmarked device
[root@rac1 grid]# oracleasm querydisk FRA
Disk "FRA" defines an unmarked device
[root@rac1 grid]# oracleasm querydisk OCR
Disk "OCR" defines an unmarked device

Read the header and the KFBTYP should be invalid !

[root@rac1 grid]# /apps01/home/12.1.0/grid/bin/kfed read /dev/oracleasm/disks/OCR AUNUM=0 BLKNUM=0
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
000000000 00000000 00000000 00000000 00000000  [................]
  Repeat 255 times
KFED-00322: file not found; arguments: [kfbtTraverseBlock] [Invalid OSM block type] [] [0]

The asm disk headers are cleared.Now we are good to reuse the asm disks for new installation of grid

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