Hi!
I am using DRBD 8.4.
I want to limit the syncer speed to approx. 300MBit/s .
During intial sync after creating the disk this worked as expected. The
parameter controlling this was "c-max-rate".
But during normal operation DRBD seems to sync always with the fastest speed
possible.
I tried also protocol versions A and C and didn't see significant differences
concerning the used network bandwidth.
This is my currently used setup:
disk {
# in units of 0.1 seconds
# 0,1s * 5 => 0,5s
c-plan-ahead 5;
# in units of 0.1 seconds
# 2 seconds max sync delay
c-delay-target 20;
# in Units of KiB/s
# ca. 300MBit/s
c-max-rate 35M;
# in Units of KiB/s
# 32MBit/s
c-min-rate 4M;
# will overrule c-delay-target, but seems to be better
# concerning linearity of the used network bandwith
c-fill-target 18M;
}
net {
#protocol C;
max-buffers 8000;
max-epoch-size 8000;
sndbuf-size 512k;
cram-hmac-alg sha1;
shared-secret "XXXXX";
verify-alg md5;
protocol A;
on-congestion pull-ahead;
congestion-fill 2G;
congestion-extents 2000;
}
I commented "c-fill-target" -> no change
I also tried this (on both sides):
drbdadm disk-options --c-plan-ahead=0 --c-max-rate=1M <resource>
-> no change
I test the used network bandwidth with the tool
speedometer -s -r eth0 -t eth0
It shows always 940MBit/s on a 1GBit ETH link, which is the whole bandwidth
of this link.
@Linbit:
Is it possible, that the driver ignore this settings after initial sync?
Any ideas?
BR,
Jasmin
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