Is the cutoff for the deferred writes > 64kb or >= 64kb by default? I.e., is a 64kb write deferred or not by default? Paul Am Do., 11. Okt. 2018 um 00:37 Uhr schrieb Sage Weil <sage@xxxxxxxxxxxx>: > > On Wed, 10 Oct 2018, Nick Fisk wrote: > > Following up from a discussion on the performance call last week. > > > > Is anybody able to confirm the behaviour of Bluestore deferred writes with new objects? > > > > From my testing it appears that new object are always directly written to the underlying block device and not buffered into flash, > > whereas existing objects <64KB are. > > I just did a quick test (on master) and it looks like the deferred writes > are working as expected in that they *do* apply to new objects (as > well as existing ones). Can you be a bit more specific about what you > observed? (which version? what workload?) > > Thanks! > sage > -- Paul Emmerich Looking for help with your Ceph cluster? Contact us at https://croit.io croit GmbH Freseniusstr. 31h 81247 München www.croit.io Tel: +49 89 1896585 90
