Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
> On 20 Oct 2015, at 16:55, Digimer <lists at alteeve.ca> wrote:
>
> 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.
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)
>
> 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
>> }
>> }
>> }
>> }
>>
>> _______________________________________________
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>> drbd-user at lists.linbit.com
>> 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?