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JBD: Barrier-based Sync Failed On md0-8 – Disabling Barriers Error and Solution

I've used the mdadm command line utility to setup and manage software RAID 6 under Debian Linux server. However, I get the following message in /var/log/messages file:
[ 14.003707] JBD: barrier-based sync failed on md0-8 - disabling barriers

How do I fix the message 'JBD error message "barrier-based sync failed"'?
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Understanding /etc/shadow file

Can you explain /etc/shadow file format used under Linux or UNIX-like system?
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