On 20/10/15 07:07 AM, Joeri Casteels wrote: > Dear All, > > > Doing a new set-up of DRBD on Ubuntu LTS 14.04 with stock DRBD > When Setting to protocol A i get double the bandwidth as protocol C anybody > an idea? not changing anything else of the settings except the protocol
Protocol A an async, C is sync. So you're probably hitting the network limit on C. https://drbd.linbit.com/users-guide/s-replication-protocols.html > PROTOCOL C: > d if=/dev/zero of=/dev/drbd0 bs=1M count=20000 oflag=direct > 20000+0 records in > 20000+0 records out > 20971520000 bytes (21 GB) copied, 46.3583 s, 452 MB/s > > PROTOCOL A: > dd if=/dev/zero of=/dev/drbd0 bs=1M count=20000 oflag=direct > 20000+0 records in > 20000+0 records out > 20971520000 bytes (21 GB) copied, 23.8356 s, 880 MB/s > > drbdsetup show r0 --show-defaults > resource r0 { > options { > cpu-mask ""; # default > on-no-data-accessible io-error; # default > } > net { > protocol C; # default > timeout 60; # 1/10 seconds, default > max-epoch-size 8000; > max-buffers 8000; > unplug-watermark 16; > connect-int 10; # seconds, default > ping-int 10; # seconds, default > sndbuf-size 2097152; # bytes > rcvbuf-size 2097152; # bytes > ko-count 7; # default > allow-two-primaries no; # default > cram-hmac-alg ""; # default > shared-secret ""; # default > after-sb-0pri disconnect; # default > after-sb-1pri disconnect; # default > after-sb-2pri disconnect; # default > always-asbp no; # default > rr-conflict disconnect; # default > ping-timeout 5; # 1/10 seconds, default > data-integrity-alg ""; # default > tcp-cork yes; # default > on-congestion block; # default > congestion-fill 0s; # bytes, default > congestion-extents 1237; # default > csums-alg ""; # default > verify-alg ""; # default > use-rle yes; # default > } > _remote_host { > address ipv4 172.16.252.8:7789; > } > _this_host { > address ipv4 172.16.252.7:7789; > volume 0 { > device minor 0; > disk "/dev/sdb"; > meta-disk internal; > disk { > size 0s; # bytes, default > max-bio-bvecs 0; # default > on-io-error detach; # default > fencing resource-only; > disk-barrier no; # default > disk-flushes no; > disk-drain yes; # default > md-flushes yes; # default > resync-rate 250k; # bytes/second, default > resync-after -1; # default > al-extents 3389; > al-updates yes; # default > c-plan-ahead 20; # 1/10 seconds, default > c-delay-target 10; # 1/10 seconds, default > c-fill-target 100s; # bytes, default > c-max-rate 102400k; # bytes/second, default > c-min-rate 250k; # bytes/second, default > disk-timeout 0; # 1/10 seconds, default > read-balancing prefer-local; # default > } > } > } > } > > _______________________________________________ > drbd-user mailing list > [email protected] > http://lists.linbit.com/mailman/listinfo/drbd-user > -- 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
