Data Migration

Most seasoned system administrators would be impressed by LVM capabilities so far, but they would also be asking themselves this question:
What happens if one of the drives making up a logical volume starts to fail?
The good news is that most LVM implementations include the ability to migrate data off of a particular physical drive. For this to work, there must be sufficient reserve capacity left to absorb the loss of the failing drive. Once the migration is complete, the failing drive can then be replaced and added back into the available storage pool.