[Beowulf] Checkpointing using flash  Lux, Jim (337C) james.p.lux
at jpl.nasa.gov Fri Sep 21 09:58:10 PDT 2012  On 9/21/12 9:44
AM, "Ellis H. Wilson III" <ellis at cse.psu.edu> wrote:  >On
09/21/12 12:29, Lux, Jim (337C) wrote: >> Flash is slow,
though...  SLC NAND flash (pretty fast, 8 Gbit part) is >>
microseconds to write a 4kbyte (approx) page.  Erasing is about
700 >> microseconds  (reading is 25 microseconds) >> MLC flash
(say 512Gbit parts with 8 kBbyte pages) takes 1.3milliseconds >>
write a page, 3.8 ms to erase (75us to read)... And has a life
of 3000 >> write/erase cycles. >Modern MLC has at least a 10k
cycle guarantee per-page, and research I'm >doing at PSU has
shown to me at least that this is a very low bar. >Often it's
way higher than that.  Yes.. I've tested 100k cycle SLC and it
lasted way more than a million. However, it's very temperature
sensitive.. Get it warm and it forgets and wears out faster.  >>
That's 53 Mpbs streaming to the part.  Yeah, any practical
design is >> to have multiple