I get “access beyond end of device” errors, drbd is broken!?
Your kernel log fills with attempt to access beyond end of device drbd0: rw=1, want=211992584, limit=211986944 Buffer I/O error on device drbd0, logical block 26499072Your file system then remounts read-only, panics or similar. When you try to fsck, you get something like The filesystem size (according to the superblock) is … blocks. The physical size of the device is …+x blocks.Envision this: |– usable area with drbd and internal meta data –|-IMD-| |– real device —————————————–|IMD is “internal meta data”. Once created, it is fixed size. With drbd 0.7 it was fixed 128MB. With drbd 8.0 it is approximately [total storage of real device]/4/8/512/2 rounded up, +36k, rounded up to the next 4k. exaple: grep -e hda4 -e drbd0 /proc/partitions 3 4 105996744 hda4 147 0 105993472 drbd0 ceil(105996744 kB / 32768) == 3235 kB + 36 kB == 3271 kB 4k aligned == 3272 kB 105996744 kB – 3272 kB == 105993472 kBIf you did mkfs /real/device, then later mount through DRBD, t
