Check to see what is writing to Linux disks

echo 1 > /proc/sys/vm/block_dump

/var/log/syslog

http://www.zarafa.com/wiki/index.php/Monitoring_Disk_IO_per_process

http://linuxtidbits.wordpress.com/2008/09/03/constant-disk-io-whats-taking-all-disk-resources/

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