On Mon, 29 Dec 2014 11:29:11 PM Christian Balzer wrote: > Reads will scale up (on a cluster basis, individual clients might > not benefit as much) linearly with each additional "device" (host/OSD). I'm taking that to mean individual clients as a whole will be limited by the speed of individual OSD's, but multiple clients will spread their reads between multiple OSD's, leading to a higher aggregate bandwidth than individual disks could sustain. I guess the limiting factor there would be network. > > Writes will scale up with each additional device divided by replica size. So adding OSD's will increase write speed from individual clients? seq writes go out to different OSD's simultaneously? > > Fun fact, if you have 1 node with replica 1 and add 2 more identical nodes > and increase the replica to 3, your write performance will be less than 50% > of the single node. Interesting - this seems to imply that writes go to the replica OSD's one after another, rather than simultaneously like I expected. thanks, -- Lindsay
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