A little question about RAID5.

The RAID5 mode is not completely without drawbacks, if the information on a hard disk in the array changes, then need to recalculate the fragmentation of the file, and the verification information needs to be recalculated, then, three hard drives need to be re-called then the entire system performance will be down. If you want to do the RAID5 array, it is best to use the same capacity of the same speed of the hard disk, the effective capacity of RAID5 mode is the smallest capacity in the array of hard disk capacity in the number of hard drives in the battle column minus one, because one of the hard disk to hold the checksum information.

If it's just one piece of the hard drive that was used to store the checksum information, how do you recover the data?

A little question about RAID5.