[Beowulf] SSD caching for parallel filesystems

Christopher Samuel samuel at unimelb.edu.au
Sun Feb 10 03:25:13 PST 2013


On 10/02/13 08:32, Bill Broadley wrote:

> SSDs and controllers often support NCQ which allows multiple
> outstanding requests.

That's only useful if the SATA spec lists the command as being
queueable, and until SATA 3.1 TRIM wasn't one of those (and so
executing it hit performance, and not executing it can also harm
performance for certain drives).

http://techreport.com/news/21311/sata-3-1-spec-brings-swap-standard-improved-trim

cheers,
Chris
-- 
  Christopher Samuel        Senior Systems Administrator
  VLSCI - Victorian Life Sciences Computation Initiative
  Email: samuel at unimelb.edu.au Phone: +61 (0)3 903 55545
  http://www.vlsci.org.au/      http://twitter.com/vlsci


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