kernel: bio too big device md0 (1024 > 256) on RHEL 7

Solution Unverified - Updated -

Issue

  • Issue appeared when a drive was replaced in a software RAID.
  • Not able to hot swap out NVMes without data corruption on databases.

  • dmesg is flooded with following error messages.

    [Fri Mar 9 12:34:51 2018] bio too big device md0 (1024 > 256) 
[Fri Mar 9 12:34:51 2018] bio too big device md0 (824 > 256) 
[Fri Mar 9 12:34:51 2018] bio too big device md0 (1024 > 256) 
[Fri Mar 9 12:34:51 2018] bio too big device md0 (1024 > 256) 
[Fri Mar 9 12:34:51 2018] bio too big device md0 (1024 > 256)

Environment

  • Red Hat Enterprise Linux 7

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