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HPE data corruption when running two times discard - Coggle Diagram
HPE data corruption when running two times discard
facts
tests
disk with two parts
steps
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
related with fields
page cache
part shares page cache with disk?
write bpftrace to observe it
device discard