Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
On 20/10/15 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
> }
> }
> }
> }
>
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>
--
Digimer
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