Understanding Logical Drives

A logical drive is a group of physical disk drives that appears to your operating system as a single drive that can be used for storing data.

A logical drive can comprise one or more disk drives or SSDs, and can use part or all of each disk drive's capacity.

You can include the same disk drive in two different logical drives by using just a portion of the space on the disk drive in each, as shown in the following figure.


Page-1 Sheet.14 Data.1 250 MB 250 MB Data.2 250 MB 250 MB Sheet.15 Data.13 250 MB 250 MB Data.6 250 MB 250 MB Data.12 250 MB 250 MB Sheet.5 Data.3 250 MB 250 MB 250 MB250 MB Sheet.4 Sheet.9 Data.3 250 MB 250 MB 250 MB250 MB Sheet.11 Data.3 Available Space 250 MB AvailableSpace 250 MB Sheet.8 Sheet.18 Sheet.19 Sheet.20 Sheet.21 Sheet.22 Sheet.16 Three Disk Drives (500 MB Each) Three Disk Drives(500 MB Each) Sheet.17 One RAID 5 Logical Drive One RAID 5 Logical Drive Sheet.23 One RAID 1 Logical Drive One RAID 1 Logical Drive Sheet.24 Appears to Operating System as one 250 MB disk drive Appears to Operating System as one 250 MB disk drive Sheet.25 Appears to Operating System as one 500 MB disk drive Appears to Operating System as one 500 MB disk drive

Disk drive space that has been assigned to a logical drive is called a segment. A segment can include all or just a portion of a disk drive's space. A disk drive with one segment is part of one logical drive, a disk drive with two segments is part of two logical drives, and so on. When a logical drive is deleted, the segments that comprised it revert to available space (or free segments).

A logical drive can include redundancy, depending on its RAID level. (See Selecting the Best RAID Level for more information.)

Once a logical drive has been created, you can change its RAID level or increase its capacity to meet changing requirements. You can also protect your logical drives by assigning one or more hot spares to them. (See Creating and Managing Hot Spares for more information.)

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