On Tue, Jul 7, 2015 at 11:43 AM, Graeme B. Bell <graeme.bell@xxxxxxxx> wrote: > > The comment on HDDs is true and gave me another thought. > > These new 'shingled' HDDs (the 8TB ones) rely on rewriting all the data on tracks that overlap your data, any time you change the data. Result: disks 8-20x slower during writes, after they fill up. > > Do they have power loss protection for the data being rewritten during reshingling? You could have data commited at position X and you accidentally nuke data at position Y. > > [I know that using a shingled disk sounds crazy (it sounds crazy to me) but you can bet there are people that just want to max out the disk bays in their server... ] Let's just say no online backup companies are using those disks. :) Biggest current production spinners being used I know of are 4TB, non-shingled. -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
