hdparm硬盘加速

• 
  　　06/29/2000
  Are you running an Intel Linux system with at least one (E)IDE hard drive?
  Wouldn't it be neat if there were a magical command to instantly double the I/O performance of your disks? Or, in some cases, show 6 to 10 times your existing throughput?
  Did you ever just wonder how to tell what kind of performance you're getting on your "tricked-out" Linux box?
  Don't overlook hdparm(icon_cool.gif. If you've never heard of it, don't worry. Most people I've talked to haven't either. But if you're running an IDE/Linux system (as many folks are,) you'll wonder how you ever got this far without it. I know I did.
  What's the big deal?
  So, you've got your brand-new UltraATA/66 EIDE drive with a screaming brand-new controller chipset that supports multiple PIO modes and DMA and the leather seat option and extra chrome... But is your system actually taking advantage of these snazzy features? The hdparm(icon_cool.gif command will not only tell you how your drives are performing, but will let you tweak them out to your heart's content.
  Now before you get too excited, it is worth pointing out that under some circumstances, these commands CAN CAUSE UNEXPECTED DATA CORRUPTION! Use them at your own risk! At the very least, back up your box and bring it down to single-user mode before proceeding.
  With the usual disclaimer out of the way, I'd like to point out that if you are using current hardware (i.e. your drive AND controller AND motherboard were manufactured in the last two or three years), you are at considerably lower risk. I've used these commands on several boxes with various hardware configurations, and the worst I've seen happen is the occasional hang, with no data problems on reboot. And no matter how mUCh you might whine at me and the world in general for your personal misfortune, we all know who is ultimately responsible for the well-being of YOUR box: YOU ARE. Caveat Fair Reader.
  
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