Abstract
The increased sophistication of storage systems has led to a similar evolution of data redundancy and capacity management. This paper distinguishes hot spare disks from hot spare capacity. The use of a RecoverableCapacitySourceCount is highlighted as a more flexible and user-focused assessment of system resiliency. The SNIA Scalable Storage Management Technical Work Group, which developed and reviewed this document, would like to recognize the significant contribution made by the principal author, Doug Voigt.