Enough physical disks must also be included to support the mirroring strategy
required, both in terms of space for the mirrored copies, and number of disks for
the policies. If mirroring is to be done across the maximum number of physical
volumes possible, for availability purposes, then it makes sense to have at least
enough space to ensure the copies are stored on separate physical volumes. A
disk failure in this scenario will not impact access to the data.
5.2.3 Logical Volumes
The delineating factors for deciding upon the number of logical volumes to
create are basically performance and availability. As many logical volumes
should be created as there are different performance and availability
requirements. The design of the logical volumes themselves ...