It is my understanding that Storreclaim creates a balloon file ,like Yankees referred to, to mark and reclaim the space and if it was set to 100 it would consume all of the available capacity for a period of time. Even briefly that isnt a desirable situation so the decision was to limit it to 95%.
The StorReclaim utility has a -rate option which we can set to reclaim anywhere from 1-95% of the unwritten space on a disk.   The customer cannot set it to anything above 95%. If a customer has a large disk, such as 5TB, that 5% can be pretty significant.  I'm curious why we can't set it to 99 or 100%?  Anyone know?
Storreclaim - why can't I set the -rate option to anything above 95?