Operational state for storage component statistics. These leaves
are derived from a list of commonly supported S.M.A.R.T. counters.
Note that while common, these attributes may not be supported by
all storage device vendors and media types.
storage-state
counters
Storage component state. These counters are derived from the
linux kernel block layer statistics in /sys/block/<dev>/stat.
Implementations which do not use the linux kernel to access
storage should provide equivalent counters.