Kernel messages "bio too big device dm-10 (512 > 256)" on RHEL

Solution Verified - Updated -


  • kernel log "bio too big device dm-10 (512 > 256)" are appearing in the messages file.
  • task blocked for more than 120 seconds error messages start to appear in /var/log/messages


  • Red Hat Enterprise Linux (RHEL) 5.6
  • Red Hat Enterprise Linux (RHEL) 6
  • SAN storage connected to HP EVA6400 storage array

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