dection 5Storage Devices.docx

So disk mirroring provides redundancy and safety

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volume would be lost because half of each file would've been lost on disk four. So disk mirroring provides redundancy and safety without any performance increase but it doesn't improve performance whereas striping really increases performance but also increases the risk of data loss. So let's go ahead and click Next and we'll assign a drive letter of F, the next available letter, and we'll format it with the file system and we will use a volume label of Stripe and we'll perform a quick format, click Next, and Finish to create the new striped volume. And we'll wait just a minute while the striped volume is formatted. Alright, our striped volume has been formatted over here. It's been assigned a drive letter of F. If we go to This PC we now see we have both the mirrored volume we created earlier and now a striped volume. Let's open up striped and let's create a new file again. Now I want to edit this file that I just created in Paint so I'll right click on Open with and then click on Paint and I'm going to make some changes to this file, just some random squiggly lines and now I'm going to hit the Save button and close Microsoft Paint. Now, here's the important thing to understandabout striped volumes. When I created this file and when I saved the changes that I made to that filethe data was actually broken up between disk three and disk four. Half of the chunks of the file were written to disk three and the other half of the chunks of the file were written to disk four and they were written simultaneously, concurrently. Thus, the save process took a lot less time than it would've if I just saved to a mirrored volume or a standard volume. Now I want to point out one thing before we end and that is the fact that these disks, disk three and disk four, were not exactly the same size. Notice that disk three was just slightly smaller than disk four. When you create a striped array the two disks involved have to be exactly the
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same size.Therefore, the amount of space used for disk four was reduced to match the exact same size of disk three, and hence we have about 128 megs of unallocated space leftover on disk four that we could not use. Summary 9:08-9:17 That's it for this demonstration. In this demo, we talked about how to create software RAID arrays in Windows. We first looked at the process for creating a mirrored volume and then we looked at the process for creating a striped volume. RAID can be implemented in the following ways: Method Description Hardware Hardware RAID uses a special controller card that includes a RAID processor. Hardware RAID is the most expensive method but provides much better performance and is more reliable than other methods. Software Software RAID uses a driver and the system CPU for controlling RAID operations. This is the slowest form of RAID. Some RAID controller cards support RAID configuration, but without the onboard RAID processor. These solutions are classified as software RAID (sometimes called fake RAID) even though you install a controller card to provide RAID capabilities.
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