This may seem like a limitation but it is not much different than a system with DAS (direct-attached storage). You may be able to restore volume groups, logical volumes and file systems from a backup but you must first recreate RAID arrays if using hardware RAID.
As an aside, when doing your DR planning, make sure you factor in the time it takes to recreate the RAID arrays when calculating recovery times; the creation of large arrays can consume quite a bit of time before any data can be restored.
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