SAN Storage array has data integrity built into it.
A storage array uses spae disk drives to take the place of any disk drives that are blocked because of errors. Hot spares are available and will spare out predictively when a drive fails.
There are two types of disk sparing:
Dynamic Sparing: Data from the failed or blocked drive is copied directly to the new spare drive from the failing drive
Correction Copy: Data is regenerated from the remaining good drives in the parity group. For RAID 6, RAID 5, and RAID 1, after a failed disk has been replaced, the data is copied back to its original location, and the spare disk is then available.
