Another option is block_dump, see http://www.linuxinsight.com/proc_sys_vm_block_dump.html
sync
echo 1 > /proc/sys/vm/block_dump
When the disk wakes up, use dmesg to see what caused activity.
Another option is block_dump, see http://www.linuxinsight.com/proc_sys_vm_block_dump.html
sync
echo 1 > /proc/sys/vm/block_dump
When the disk wakes up, use dmesg to see what caused activity.