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Table Of Contents  CertiGuide to Network+
 9  Chapter 0110: Network Operating Systems (NOS)
      9  IX  RAID (Server Disk Arrays)

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RAID 5
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X  Network Attached Storage (NAS)
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RAID Volumes

Joining multiple drives makes a volume. The total of multiple physical drives are joined as one logical volume. A volume is an easy way to extend storage when running low on drive space. For example, your sales database is getting full and you need to quickly create more space with a minimum of downtime. Searching all available drive space on the network we see several drives on different machines have the needed space available. By adding these drives to the system as though they were one physical drive we can create a volume that appears as one drive. The concept of joining physical drives into a logical volume is not supported by all OS’s. Some OS’s that support logical volumes include Windows 2000 and some UNIX versions.

Volumes

If one physical drive fails, then all data on the entire volume is toast. If the volume consists of multiple physical drives, then even the data on the physical drive that did not fail, becomes inaccessible.

To get the largest single amount of space use a volume.



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RAID 5
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X  Network Attached Storage (NAS)
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