Optimizing I/O on Windows

Question

Im currently building a new PC, the specification is below:

• Windows 7 Ultimate
• Intel Core 2 Due 2.6
• 2GB Ram
• Hard Drives
  • 150GB Sata
  • 180GB Sata
  • 200GB Sata
• 512MB Express GFX Card

Now my question(s) mainly relate to the hard drives, most of you guy's will know that the major bottle neck of a computer is the hard disk, the fact that it has 1 needed it cannot read / write from 2 places concurrently.

Im trying to speed up I/O of the hard drives and this is a learning curve for myself but i think the question is plausible but im not sure about other factors that may effect what im thinking about doing.

As I have 3 hard drives im wondering if I can spread a windows operating system across multiple hard drives, so that the bulk of the OS (Program Files) would be placed on a separate drive, thus spreading the I/O Bottleneck out to reduce the load.

Now I understand that Linux distributions do this, such as the Home Folder can be placed on a separate HDD.

• Would it be a good idea to spread the I/O across several hard drives
• Is this possible on windows based operating systems
• Is there any other ways that can speed up I/O

as stated above, this is not something that I need to do on this computer, but it's something I would like to know how to do if it's possible.

Regards

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oine possible solution I have read about is that after Windows 7 Has installed and your at the "Create Users" screen, if you hit Shift + F10 you will get a Command Prompt, you can then do the following:

• Make your partitions on your hard drives.
• Copy all your files from User data and Program Files to the new locations
• Open Registry Editor and change a few key's to point to the new locations
• Continue to create the user's and should be all ok.

Answer 1

The bottleneck here is the harddrives - as you mentioned - but it isn't the concurrent problem you describe. It's the fact that hard-drives are many, many times slower than RAM.

If you want to speed up your computer:

• buy more RAM - like, 4GB, because 2GB is basically the bare-minimum standard nowadays
• buy the fastest HDs you can - 7200RPM, I believe

But if you want to "spread out" your OS, you can do this via striping across the disks. Check out RAID to learn more, as in general, this kind of striping is done to replicate data for the purposes of HD failure. http://en.wikipedia.org/wiki/RAID

• I'd also recommend swapping your Duel Core for a Core 2 Duo, they are much better

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How It Memory Works

Your computer will store as much as it can on it's RAM. This is so that when it needs any data, whether it be a file or instruction, it can simply look at it's internal memory for a super fast response. If that data isn't in memory, it has to go to the HardDrive to fetch it. This takes a lot of time, as physical devices are slow.

When the computer fills up it's RAM, it has to store some of the stuff back onto the HD and fetch the new things it needs from the HD and put it on RAM. If you're running a gigantic program or doing lots of things at once, you run into a place where your computer is constantly shuffling things from RAM to HD, because your working set of memory(the things you really need and are using) doesn't fit on RAM anymore - this is called thrashing, and you hear your HD being noisy and your computer will be quite slow and sluggish.

So, the more RAM you have, the more stuff you can fit into super-fast memory (rather than fetching it from your HD), the less waiting you have to do for the HD, and the all-around faster your computer will be.

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To answer your questions:

Would it be a good idea to spread the I/O across several hard drives

For the purposes of speeding up your computer, you really won't see that much of a difference. Buying more RAM is the most effective solution.

If you're backup-conscious, RAID isn't a bad idea at all and will achieve what you're going for.

Is this possible on windows based operating systems

Yes, but it's more common to do it physically and is controlled in the BIOS. See this howto : http://www.pcmag.com/article2/0,2817,2249572,00.asp

Is there any other ways that can speed up I/O

In order from cost-effectiveness:

• buy more RAM
• buy a better processor
• buy 7200RPM disks

Answer 2

If you mean hold one drive for the Operating System and another for all the Data Storage, you can do this.

All you need to do is install Windows on one Hard Drive, and then once your in Windows just simply go to C:\Users\**USERNAME** and you will be presented with all your user folders, just right click each one and go to properties. and go to Location, change the location to that of the second Hard Drive, e.g if your second drives letter is H, then to change the Documents folder location just use H:\Documents

This will perform all data storage on the second drive while all operating system I/O will be done on the OS Drive.

edit:

To move a location of other Windows folders, consider using the mklink command of windows

Here's a simple tutorial on how to do this: http://windows7themes.net/windows-7-mklink-command-use-to-create-symbolic-links.html

You may face an error if you were to do

mklink /J "C:\Program Files" "H:\Program Files"

as it's complaining about C:\Program Files existing.

Here's a possible way you could go around this issue: http://tuts4tech.net/2009/08/05/windows-7-move-the-users-and-program-files-directories-to-a-different-partition/