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Beginners Guides: Installing RAID on a Desktop PC

Beginners Guides: Installing RAID on a Desktop PC - PCSTATS
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Abstract: With the right number of identical hard drives, motherboards that support RAID can choose from RAID 0, RAID 1, and sometimes even RAID 0+1 for improved performance, data redundancy and backups.
Filed under: Beginners Guides Published:  Author: 
External Mfg. Website: PCSTATS Apr 22 2008   Mike Dowler  
Home > Reviews > Beginners Guides > PCSTATS

Hardware or software RAID?

What is better, hardware or software RAID? Good question.

It really depends on your means and expectations. Software RAID setups through an operating system are inherently lower in performance than hardware RAID controllers, due to the lack of dedicated hardware. They also are, in the case of Windows XP Pro at least, much easier to set up and much more flexible in terms of disk use than a hardware based system.

A second factor to consider is whether you want your operating system disk to be part of the RAID array you create? A major limitation of the WinXP RAID implementation is that the operating system must be installed before a RAID array can be created. This means that if you would like to stripe your operating system disk for increased loading speed, you are out of luck unless you go with a hardware RAID controller.

So to cut it short, if you want the maximum benefit out of creating a striped drive, or need to create a RAID 1 mirror for backups, invest in a motherboard with an on board RAID controller or a PCI add-on controller card. If you want to experiment with striped drives for speed, go with the software solution provided by Windows 2000 or XP as it is easier and cheaper.

How to set up Software RAID in windows XP Professional

Like most other hard drive and storage options, RAID is managed through Windows XP's disk management window, found by right clicking on 'my computer,' then selecting 'manage' followed by 'disk management.' Windows XP Professional is only capable of creating RAID 0 striped arrays, while the various Windows Server operating systems can also create software RAID 1 mirror arrays.

Creating a striped RAID array in XP:

For the purpose of this section of the guide we installed two blank 17GB hard drives on a test system. To create a striped array you must first have at least two drives with a portion of 'unpartitioned space' free. The largest stripe you can create will be twice the size of the smallest unused space on either of the disks. If you have two disks, one with 4GB of unpartitioned space and one with 3GB, the largest striped array you could create would be 6GB, as the area of space used by the stripe on each disk must be the same.

The first step is to convert both disks from basic to dynamic disks within Windows. A dynamic disk is a disk that contains an additional database of other dynamic disks on the system. Dynamic disks can only be read by Windows 2000, XP Professional and the various Windows Server operating systems, and are required to create software RAID arrays within Windows.

For more detail on this subject, see PCstats' Guide to the little known features of Windows XP.

To convert the disks from basic to dynamic, right click the grey box on the left that contains the disk names (disk 1, disk 2, etc.) and select 'convert to dynamic diskā€¦'

From the next Window you can check both blank drives and click 'ok' to convert them.

Once both disks are listed as dynamic, right click the 'unpartitioned space' of either drive and select 'new volume.' On the next page we'll set these drives to be striped, and configure the software RAID options.

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Contents of Article: PCSTATS
 Pg 1.  Beginners Guides: Installing RAID on a Desktop PC
 Pg 2.  RAID Terminology Explained
 Pg 3.  Parity and Common types of RAID
 Pg 4.  RAID 1 and RAID 0+1 Explained
 Pg 5.  — Hardware or software RAID?
 Pg 6.  Setting up a hardware RAID array
 Pg 7.  Configuring Promise RAID
 Pg 8.  Configuring Highpoint RAID controllers
 Pg 9.  The advantages of RAID: Tests
 Pg 10.  HD Tach and Timed Data Transfer Tests

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