[DRBD-user] DRBD 8.3.7 and Debian 6 (2.6.32-5-xen-amd64)

ml ml mliebherr99 at googlemail.com
Tue Jan 28 15:42:07 CET 2014

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

Hello List,

i am running Debian 6 (2.6.32-5-xen-amd64) with DRBD 8.3.7

I know - i should upgrade now - or better  => Yesterday :)

I will, and i already did pre tests. However we currently have a
performance problem with one of our production servers.

They are connected with a intel GBit Nic. iperf schows 916 Mbits/sec in
both directions.
I have got SSDs on both sides. So I/O is not a problem.

I only get a sync speed: 56,036 (53,756) K/sec

Here is my config:

global {       usage-count yes; }

common {      syncer { rate 200M; } }

resource foobar-live-lvm {

        protocol A;

        startup {
                wfc-timeout 0; ## 2 min
                degr-wfc-timeout 0; ## wait forever.

        disk {
                on-io-error detach;

        net {
                after-sb-0pri discard-zero-changes;
                after-sb-1pri discard-secondary;

                timeout 60;
                connect-int 10;
                ping-int 10;
                max-buffers 2048;
                max-epoch-size 2048;

        on host-1 {
                device /dev/drbd1;
                disk /dev/vg/foobar-live-lvm;
                meta-disk /dev/vg/meta-foobar-live-lvm[0];

        on host-2 {
                device /dev/drbd1;
                disk /dev/vg/foobar-live-lvm;
                meta-disk /dev/vg/meta-foobar-live-lvm[0];

Any Idea why my sync speed is that slow?

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