On 20/10/15 11:47 AM, Lionel Sausin wrote: > > > Le 20/10/2015 17:30, Joeri Casteels a écrit : >>> Protocol A an async, C is sync. So you're probably hitting the network >>> limit on C. >> I don’t think so since it has a direct 20G trunk in-between with perf >> i get 19.6Gbit/s on single threat. With A (async when i monitor the >> network it also hits 2x the network speed as C does) > "sync" means the round-trip time (down to the remote disks) is what > counts, not the bandwidth.
Correct. In protocol C, the write is not completed until it has hit persistent storage on both nodes. I guessed it was your network, but it could also be your disk. Also, use 'fio', not 'dd' to test performance. -- Digimer Papers and Projects: https://alteeve.ca/w/ What if the cure for cancer is trapped in the mind of a person without access to education? _______________________________________________ drbd-user mailing list [email protected] http://lists.linbit.com/mailman/listinfo/drbd-user
