dection 5Storage Devices.docx

While some raid configurations provide fault

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While some RAID configurations provide fault tolerance in the event of a disk failure, configuring RAID is not a substitute for regular backups. Another term that is sometimes used with disk arrays is JBOD (just a bunch of disks). JBOD is not a RAID configuration, but like RAID configures multiple disks into a single logical storage unit. A JBOD configuration creates a single volume using space from two or more disks. Spanning is another term for JBOD because the volume spans multiple physical disks. Data is not striped between disks, but rather just saved to one or more disks (depending on how the operating system decides to save each file). On a new JBOD configuration, data is typically saved to the first disk until it is full, then additional data is saved to the second disk and so on. Disks used within the spanned volume can be of different sizes. JBOD uses the entire space available on all disks for data storage (no overhead). There are no performance or fault tolerance benefits with JBOD. If one drive fails, you might be able to use disk recovery tools to recover data from the remaining disks. Configuring a RAID Array 0:00-3:00 In this demonstration, we're going to spend some time learning how to create a software RAID array within Windows. When you need to create a RAID array you have basically two options. One is to create a hardware RAID array using an expansion board that's installed in an expansion slot on the motherboard or maybe an integrated RAID controller on the motherboard. Those solutions work really well. They provide the best performance but they also cost a little more. If you don't want to spend the money another option is to use a software RAID array that's defined within Windows. And that's what we're going to do in this demonstration. Software RAID arrays do not perform as well as hardware RAID arrays but they cost a lot less to implement. So to do this I'm going to right click on my Windows icon and then click on Disk Management from the popup menu. Go ahead and maximize this window. Now in order to create a software RAID array you have to have more than one hard disk drive installed in the system. Notice that on this system I actually have five hard disks installed. I have disk zero, one, two, three, and four. You'll notice that disk zero currently has my Windows operating system installed on it and I've used the entire hard disk drive for the system drive. So there's no space leftover on disk zero to use for anything else.However, I have disk one, two, three, and four also installed in the system and they don't have anything on them. We can use them to create RAID arrays. Now you'll notice that disk one, two, three, and four are currently defined as basic disks and that won't work. If we want to create a software RAID array in disk management we can only use dynamic disks. So let's go ahead and convert these disks from basic disks to dynamic disks. So I'll right click on disk one and click on Convert to dynamic disk. Notice that I'm given the option to convert either just
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  • Spring '14
  • Serial ATA

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