The Layout Of A Logical Volume
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- As we said, a logical volume is stored on a volume group.
- The logical volume is made of a list of physical extents (not necessarily
contiguous) on the volume group.
- In addition, we might want to make the logical volume striped - that is,
its data chunks will be stored alternately on different physical devices
of the volume group. This may increase throughput.
- Thus, when we send I/O to a logical volume, it will may get mapped twice.
- This mapping is done in memory. If the device is very large - the map
might be very large too...