Making the best use of SSDs

摘要

Many of the standard ways that hard drives are used may not be appropriate for SSDs. Putting SSDs in a RAID 5 array, for instance, may make the RAID controller the bottleneck in the storage system. In addition this ensures that all the drives in the array could fail at that same time, since writes are distributed evenly over all drives, and wear-leveling algorithms on the drives cause all cells to wear evenly as well. This means that if the drives reach their limits on writes at the same time, all the drives in an array could fail at about the same time.