Le 24/09/2018 à 16:36, Brice CHAPPE a écrit : > Hi mailing ! > > > > I have three nodes drbdmanage cluster. > > Two nodes work as storage backend (S1/S2). > > One node as satellite pure client (for future nova usage) > > I work on 20GB/s LACP network between storage backends and satellite pure > client > node > > > > So, when I bench on local drbd on storage node with two nodes connected with : > > dd if=/dev/zero of=/dev/drbd104 bs=1M count=512 oflag=direct > > I have almost 680 MB/s => It is ok for me > > > > After I assign the resource to the satellite node. > > I try the same thing on it : > > dd if=/dev/zero of=/dev/drbd104 bs=1M count=512 oflag=direct > > I get 420MB/s => why ?
You're experiencing latency ;-) Check using scripts here : https://docs.linbit.com/docs/users-guide-9.0/#p-performance With a little maths, you'll understand what's happening (consider your 1M block size and retry with smaller I/O). Best regards, Julien _______________________________________________ drbd-user mailing list drbd-user@lists.linbit.com http://lists.linbit.com/mailman/listinfo/drbd-user
