kernel: JBD: barrier-based sync failed on dm-0 - disabling barriers
 

hi this is madhu,i came across with this problem in my daily aminstration issues,so plese let me know about why this error occur.

http://www.google.com/search?client=...utf-8&oe=utf-8

Seems to be harmless, but barriers are supported by dm with recent versions of the kernel and dm.