Thank you very much. Problem was solved by activating selective acknowledgments.
James Robnett a écrit : > Can't really help with your larger question but I had a similar > experience with network appropriate write rates and slower reads. > > You might check that you have enabled TCP selective acknowledgments, > echo 1 > /proc/sys/net/ipv4/tcp_sack > or > net.ipv4.tcp_sack = 1 > > This can help in cases where your OSS's have larger pipes than > your clients and your files are striped across multiple OSS's. > When multiple OSS's are transmitting to a single client they can > over run the switch buffers and drop packets. This is particularly > noticeable when doing IOzone type benchmarking from a single client > with a wide lfs stripe setting. > > With selective ACKs enabled the client will request a more minimal > set of packets be retransmitted ... or at least that's what I finally > deduced when I ran into it. > > James Robnett > NRAO/NM > _______________________________________________ > Lustre-discuss mailing list > Lustre-discuss@lists.lustre.org > http://lists.lustre.org/mailman/listinfo/lustre-discuss > > _______________________________________________ Lustre-discuss mailing list Lustre-discuss@lists.lustre.org http://lists.lustre.org/mailman/listinfo/lustre-discuss