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HPE data corruption when running two times discard - Coggle Diagram

- - - - fill part2 with hazard pattter
        
        direct write
      - mkfs.xfs part1
        
        direct write with discard
      - read part1 data and compare with pattern
        
        buffered read
      - mkfs.xfs part1
      - read part1 and compare
        
        data is wrong on some offset
        
        buffered read
- - - - write bpftrace to observe it

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HPE data corruption when running two times discard

HPE data corruption when running two times discard

facts

tests

disk with two parts

steps

fill part2 with hazard pattter

mkfs.xfs part1

read part1 data and compare with pattern

mkfs.xfs part1

read part1 and compare

data is wrong on some offset

related with fields

direct write

direct write with discard

buffered read

buffered read

page cache

part shares page cache with disk?

write bpftrace to observe it

device discard