1.echo 1 > /proc/sys/vm/block_dump
dmesg | egrep "READ|WRITE|dirtied" | awk '{print $1}'|sort|uniq -c | sort -rn | head
发现oracle的lgwr比较多
参考
http://blog.csdn.net/rocky2com/article/details/6663279
2. 上去查看log
select * from v$log;
select * from v$logfile;
发现log半小时切换一次
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