... drives[*]
Today, of-the-shelf disks fast approach capacities of 100 GB and this number is doubled almost every 14 - 18 month.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
...$D_i$[*]
This is only true under the assumtions that the failure rate is constant which is equal to an exponentially distributed time to failure and the failures are independent of each other. For all systems considered in this paper these assumptions are fulfilled.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.
.