首先可以先停止系统日志:
/etc/init.d/rsyslog stop
然后开启block_dump：
echo 1 > /proc/sys/vm/block_dump
dmesg | egrep “READ|WRITE|dirtied” | egrep -o ‘([a-zA-Z]*)’ | sort | uniq -c | sort -rn | head
问题解决后，关闭block_dump
echo 0 > /proc/sys/vm/block_dump
/etc/init.d/rsyslog start