hdparm的问题

playfish

我用hdparm -a256 -A1 -c1 -d1 -m16 -u1 -k1 /dev/hda来增强硬盘性能，但是每次开机都要运行一次。我查了一下，-k1参数就是保持设置，但每次一开机就回到没有加速过的状态。我不知道怎么才能让它开机就自动加载我设置的参数，向各位大虾请教。

wokick

修改你的/etc/conf.d/hdparm 文件，
然后把rc-update add hdparm default。
这样每次开机，都会运行你的hdparm了。

d00m3d

This may be a little bit better:

hdparm -a1024 -A1 -c1 -d1 -m16 -u1 -k1 /dev/hda

You can use hdparm -tT /dev/hda to do a benchmark before and after the change.

playfish

我是笔记本的5400转的富士通硬盘，8m缓存，40g容量，-a1024不会损伤硬盘吗？

d00m3d

The -a flag is to set the readahead buffer.  Unlike the -X flag, it should not cause any troubles.

I am also using 笔记本的5400转的Hitachi and also a Samsung硬盘，8m缓存，40g容量.  I install them in USB HDD cases.  I don't experience any problems with the -a1024 flag.

Zer4tul

楼上的，好像-a设置越大，对大文件的读写性能越好，但是对小文件的读写就……没说了……不过man里面有句话是，如果小文件多的话，建议把-a设置小一点，why?

d00m3d

Yes, the bigger is not always better.  It is already explained in the man page.  In fact, I don't see any improvements if I replace -a1024 with -a2048.  However, I am pretty sure the improvement from -a256 to -a1024.

It is may due to the fact that -a1024 well suit the amount of data being transferred during normal operations.  Well, you may do a benchmark test to determine the right value for you.

Zer4tul

恩，我也发现了……从256到1024的提升很明显。

d00m3d

Post by playfish
我是笔记本的5400转的富士通硬盘，8m缓存，40g容量，-a1024不会损伤硬盘吗？

Maybe you can consider to add the -S option, e.g.  -S120 or -S180 etc, so that your harddrive will be spin down when it is idle for a fix period of time.  It may prolong the life of your harddrive.