Installation guide

Chapter 2. LVM Components

of 4MB. This volume group includes 2 physical volumes named PV1 and PV2. The physical volumes

are divided into 4MB units, since that is the extent size. In this example, PV1 is 100 extents in size

(400MB) and PV2 is 200 extents in size (800MB). You can create a linear volume any size between

1 and 300 extents (4MB to 1200MB). In this example, the linear volume named LV1 is 300 extents in

size.

Figure 2.3. Linear Volume with Unequal Physical Volumes

You can configure more than one linear logical volume of whatever size you require from the pool

of physical extents. Figure 2.4, “Multiple Logical Volumes” shows the same volume group as in

Figure 2.3, “Linear Volume with Unequal Physical Volumes”, but in this case two logical volumes have

been carved out of the volume group: LV1, which is 250 extents in size (1000MB) and LV2 which is 50

extents in size (200MB).

Figure 2.4. Multiple Logical Volumes

2.3.2. Striped Logical Volumes

When you write data to an LVM logical volume, the file system lays the data out across the underlying

physical volumes. You can control the way the data is written to the physical volumes by creating a