HP StoreAll Storage - Manual (Page 154)

files will be encountered at the beginning of the job, causing space on tier 2 to be consumed faster
than on tier 1. Once a destination tier is full, obviously no further movement in that direction is
possible.
These rules in these two examples are ambiguous because they give rise to possible conflicting
file movement. It is the user’s responsibility to write unambiguous rules for the data tiering policy
for their file systems.
154 Using data tiering