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Are duplicates of logical extent offsets different replicas?
Are the replicas listed always sorted by number (first, second, third, ...) or in random order?
Where "replica 2" offset 448k ?
Is the physical offset the offset on the device? Which device id?

Example:
dd if=/dev/random of=tst.dat bs=512k count=1

filefrag -v -b1024 tst.dat output:
Filesystem type is: ca451a4e
File size of tst.dat is 524288 (512 blocks of 1024 bytes)
 ext:     logical_offset:        physical_offset: length: expected: flags:
   0:        0..      63:   11856128..  11856191: 64:             encoded
   1:        0..      63:   16075264..  16075327: 64:             encoded
   2:       64..     127:   11856192..  11856255:     64: 16075328: encoded
   3:       64..     127:   16075328..  16075391:     64: 11856192: encoded
   4:      128..     191:   11856256..  11856319:     64: 16075392: encoded
   5:      128..     191:   16075392..  16075455:     64: 11856256: encoded
   6:      192..     255:   11856320..  11856383:     64: 16075456: encoded
   7:      192..     255:   16075456..  16075519:     64: 11856320: encoded
   8:      256..     319:   13653248..  13653311:     64: 16075520: encoded
   9:      256..     319:   16383488..  16383551:     64: 13653248: encoded
  10:      320..     383:   13653312..  13653375:     64: 16383552: encoded
  11:      320..     383:   16383552..  16383615:     64: 13653312: encoded
  12:      384..     447:   13653376..  13653439:     64: 16383616: encoded
  13:      384..     447:   16383616..  16383679:     64: 13653376: encoded
  14:      448..     511:   13653440..  13653503:     64: 16383680: last,encoded,eof
tst.dat: 14 extents found


--
Michael


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