Using kfed/dd to repair ASM disk header corruption

Table of Contents



  • Note – Don’t run these commands on your production system as you can easily corrupt your data
  • In ASM versions and later, the ASM disk header block is backed up in the second last ASM metadata block in the allocation unit 1.

Kfed parameters

  • aun – Allocation Unit (AU) number to read from. Default is AU0, or the very beginning of the ASM disk.
  • aus – AU size. Default is 1048576 (1MB). Specify the aus when reading from a disk group with non-default AU size.
  • blkn – block number to read. Default is block 0, or the very first block of the AU.
  • dev – ASM disk or device name. Note that the keyword dev can be omitted, but the ASM disk name is mandatory.

4 thoughts on “Using kfed/dd to repair ASM disk header corruption”

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