ASM tools used by Support : KFOD, KFED, AMDU (Doc ID 1485597.1)

KFOD – Kernel Files OSM Disk

KFOD utility is used to simulate the disk discovery from the operating system level and it can be found in $GRID_HOME/bin directory (or ASM_HOME/bin in older releases).

Note:
1) KFOD is used at installation time as well (by OUI,DBCA or ASMCA) in order to perform disk discovery.
2) In case of a failed installation (e.g no $GRID_HOME/bin existing yet) KFOD can be found under your stage folder: <stage_folder>/grid/stage/ext/bin/
In such cases you might need to set LD_LIBRARY_PATH to <stage_folder>/grid/stage/ext/lib.

Using kfod 
[grid@grac41 ]$ kfod status=TRUE asm_diskstring='/dev/asm*' disk=ALL 
--------------------------------------------------------------------------------
 Disk          Size Header    Path                                     User     Group   
================================================================================
   1:      10236 Mb MEMBER    /dev/asm_data_10G_disk0                  grid     asmadmin
   2:      10236 Mb MEMBER    /dev/asm_data_10G_disk1                  grid     asmadmin
   3:      10236 Mb MEMBER    /dev/asm_data_10G_disk2                  grid     asmadmin
   4:      10236 Mb MEMBER    /dev/asm_data_10G_disk3                  grid     asmadmin
   5:       2047 Mb MEMBER    /dev/asm_ocr_11204_2G_disk1              grid     asmadmin
   6:       2047 Mb MEMBER    /dev/asm_ocr_11204_2G_disk2              grid     asmadmin
   7:       2047 Mb MEMBER    /dev/asm_ocr_11204_2G_disk3              grid     asmadmin
   8:       1023 Mb MEMBER    /dev/asm_test_1G_disk1                   grid     asmadmin
   9:       1023 Mb MEMBER    /dev/asm_test_1G_disk2                   grid     asmadmin
  10:      20473 Mb MEMBER    /dev/asmdisk_fra1                        grid     asmadmin
  11:      20479 Mb MEMBER    /dev/asmdisk_fra2                        grid     asmadmin
--------------------------------------------------------------------------------
ORACLE_SID ORACLE_HOME                                                          
================================================================================
     +ASM1 /u01/app/11204/grid                                                  
     +ASM3 /u01/app/11204/grid                                                  
     +ASM2 /u01/app/11204/grid

KFED – Kernel Files metadata EDitor

KFED is a useful tool which allows to analyze ASM disk header information when ASM diskgroups can not be mounted.

NOTE:
KFED executable comes with installation from 11.1 onwards; for the older version you must build it.
But it is not included  the source of the software, therefore it is not available until GI installation completes.  
If you need to use it before GI being installed, please refer

root@grac41 Desktop]# kfed read  /dev/asm_test_1G_disk1 | egrep 'name|size|type'
kfbh.type:                            1 ; 0x002: KFBTYP_DISKHEAD   <-- ASM disk header
kfdhdb.dskname:               TEST_0000 ; 0x028: length=9          <-- ASM disk name
kfdhdb.grpname:                    TEST ; 0x048: length=4          <-- ASM DG name
kfdhdb.fgname:                TEST_0000 ; 0x068: length=9          <-- ASM Failgroup
kfdhdb.capname:                         ; 0x088: length=0
kfdhdb.secsize:                     512 ; 0x0b8: 0x0200            <-- Disk sector size   
kfdhdb.blksize:                    4096 ; 0x0ba: 0x1000            <-- ASM block size
kfdhdb.ausize:                  1048576 ; 0x0bc: 0x00100000        <-- AU size : 1 Mbyte 
kfdhdb.dsksize:                    1023 ; 0x0c4: 0x000003ff        <-- ASM disk size : 1 GByte

 

AMDU – ASM Metadata Dump Utility

AMDU is an utility to extract all the available metadata from one or more ASM disks and/or generate formatted printouts of individual blocks.
The utility does not require that any diskgroup to be mounted.

Key features 
 - Dumps metadata for ASM disks
 - Extract the content of ASM files even DG isn't mounted

Oracle Support may ask you to provide AMDU output, especially when facing internal errors related to the ASM metadata

Locate all DG and dump FRA2 DG 
$  asmcmd lsdg
State    Type    Rebal  Sector  Block       AU  Total_MB  Free_MB  Req_mir_free_MB  Usable_file_MB  Offline_disks  Voting_files  Name
MOUNTED  NORMAL  N         512   4096  1048576     40944    18531            10236            4147              0             N  DATA/
MOUNTED  EXTERN  N         512   4096  1048576     40952    31315                0           31315              0             N  FRA2/
MOUNTED  NORMAL  N         512   4096  4194304      6132     4960             2044            1458              0             Y  OCR/
MOUNTED  NORMAL  N         512   4096  1048576      2046     1746                0             873              0             N  TEST/
[grid@grac41 ]$ amdu -diskstring '/dev/asm*' -dump 'FRA2'
    amdu_2014_07_15_11_20_42/

$  cd amdu_2014_07_15_11_20_42/
[grid@grac41 ]$ ls -l
total 144432
-rw-r--r--. 1 grid oinstall 147865600 Jul 15 11:20 FRA2_0001.img
-rw-r--r--. 1 grid oinstall     11920 Jul 15 11:20 FRA2.map
-rw-r--r--. 1 grid oinstall     12468 Jul 15 11:20 report.txt
--> report.txt
************************** SCANNING DISKGROUP FRA2 ***************************
            Creation Time: 2014/07/10 17:16:26.860000
         Disks Discovered: 2
               Redundancy: 1
                  AU Size: 1048576 bytes
      Metadata Block Size: 4096 bytes
     Physical Sector Size: 512 bytes
          Metadata Stride: 113792 AU
   Duplicate Disk Numbers: 0
---------------------------- SCANNING DISK N0010 -----------------------------
Disk N0010: '/dev/asmdisk_fra1'
           Allocated AU's: 4818
                Free AU's: 15655
       AU's read for dump: 73
       Block images saved: 17669
        Map lines written: 73
          Heartbeats seen: 0
  Corrupt metadata blocks: 0
        Corrupt AT blocks: 0
---------------------------- SCANNING DISK N0011 -----------------------------
Disk N0011: '/dev/asmdisk_fra2'
           Allocated AU's: 4819
                Free AU's: 15660
       AU's read for dump: 76
       Block images saved: 18431
        Map lines written: 76
          Heartbeats seen: 0
  Corrupt metadata blocks: 0
        Corrupt AT blocks: 0
------------------------- SUMMARY FOR DISKGROUP FRA2 -------------------------
           Allocated AU's: 9637
                Free AU's: 31315
       AU's read for dump: 149
       Block images saved: 36100
        Map lines written: 149
          Heartbeats seen: 0
  Corrupt metadata blocks: 0
        Corrupt AT blocks: 0
--> FRA2_0001.img  FRA2.map  are binary files

 

Reference

  • KFOD, KFED, AMDU (Doc ID 1485597.1)
  • Note 1180491.1 - KFED Tool For Windows OS
  • Note 1346190.1 - KFED.PL for diagnosing – ORA-15036 ORA-15042 ORA-15020 ORA-15033
  • Note 1505005.1 – Where to find kfed utility before Oracle Grid Infrastructure is installed

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