"Max-buffers 8k" appear to be the sweet spot for me.
I'm now getting 145-150 MB/s transfer rates between nodes which I'm
happy with.
The biggest problem was I didn't have "syncer" section defined at all.
Currently my fully working and behaving config looks like below:
global { usage-count no; }
common { protocol C; }
resource r0 {
disk {
on-io-error detach;
no-disk-flushes;
no-disk-barrier;
c-plan-ahead 0;
}
net {
max-buffers 8k;
}
syncer {
rate 150M;
al-extents 6400;
}
on lion {
device /dev/drbd0;
disk /dev/sdb1;
address 192.168.200.1:7788;
meta-disk internal;
}
on tiger {
device /dev/drbd0;
disk /dev/sdb1;
address 192.168.200.2:7788;
meta-disk internal;
}
}
On 11/10/18 15:06, Robert Altnoeder wrote:
On 10/11/2018 03:56 PM, Oleksiy Evin wrote:
Try to remove the following:
c-fill-target 24M;
c-min-rate 80M;
c-max-rate 720M;
sndbuf-size 1024k;
rcvbuf-size 2048k;
Then gradually increase max-buffers from 4K to 12K checking its impact
to the sync speed. Make sure you have the same config on both nodes
and apply the changes with "drbdadm adjust all" on both nodes too.
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