Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Exploiting Data Longevity for Enhancing the Lifetime of Flash-based
  Storage Class Memory   Storage-class memory (SCM) combines the benefits of a solid-state memory,
such as high-performance and robustness, with the archival capabilities and low
cost of conventional hard-disk magnetic storage. Among candidate solid-state
nonvolatile memory technologies that could potentially be used to construct
SCM, flash memory is a well-established technology and have been widely used in
commercially available SCM incarnations. Flash-based SCM enables much better
tradeoffs between performance, space and power than disk-based systems.
However, write endurance is a significant challenge for a flash-based SCM (each
act of writing a bit may slightly damage a cell, so one flash cell can be
written 10^4--10^5 times, depending on the flash technology, before it becomes
unusable). This is a well-documented problem and has received a lot of
attention by manufactures that are using some combination of write reduction
and wear-leveling techniques for achieving longer lifetime. In an effort to
improve flash lifetime, first, by quantifying data longevity in an SCM, we show
that a majority of the data stored in a solid-state SCM do not require long
retention times provided by flash memory (i.e., up to 10 years in modern
devices); second, by exploiting retention time relaxation, we propose a novel
mechanism, called Dense-SLC (D-SLC), which enables us perform multiple writes
into a cell during each erase cycle for lifetime extension; and finally, we
discuss the required changes in the flash management software (FTL) in order to
use this characteristic for extending the lifetime of the solid-state part of
an SCM. Using an extensive simulation-based analysis of a flash-based SCM, we
demonstrate that D-SLC is able to significantly improve device lifetime
(between 5.1X and 8.6X) with no performance overhead and also very small
changes at the FTL software.

11
The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
9
The categories of this paper are: nlin
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
30
The categories of this paper are: q-alg
21
The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio