Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
----- Original Message -----
> From: "rahulcs" <singh.rahul.1983 at gmail.com>
> To: drbd-user at lists.linbit.com
> Sent: Monday, July 16, 2012 10:53:18 AM
> Subject: [DRBD-user] Unable to rate limit synchronization traffic with DRBD
>
>
> Hi All,
> I am a new user of DRBD. I am trying to use DRBD to send disk updates
> to a
> backup disk at a configuration rate in an asynchronous manner. From
> the DRBD
> documentation it looks like i should be able to do this if i use
> Protocol A.
>
>
> But when i write a file onto the partition that is being backed up by
> DRBD i
> continue to see that the network traffic is very high inspite of me
> setting
> the sync rate.
>
> Here is my /etc/drbd.d/global_common.conf
> global {
> usage-count yes;
> }
>
> common {
> }
>
> and /etc/drbd.d/r0.res
> resource r0 {
> protocol A;
> syncer {
> rate 1M;
> }
> on obelix27 {
> device /dev/drbd1;
> disk /dev/sda1;
> address 192.168.245.27:7789;
> meta-disk internal;
> }
> on obelix28 {
> device /dev/drbd1;
> disk /dev/sda1;
> address 192.168.245.28:7789;
> meta-disk internal;
> }
> }
>
> I have ubuntu 11.10 with linux kernel 3.0.0-12-generic. I installed
> the
> userland part of DRBD using apt-get which is version 8.3.
>
> I have tried issuing the drbdadm syncer r0 command. I am writing data
> on the
> partition using
>
> dd if=/dev/zero of=/mnt/more/file.dat count=1024 bs=1048576 and i am
> measuring the network traffic using ifstat. Inspite of my setting the
> sync
> rate to 1MB i continue to see 10 MB traffic.
>
> What am i doing wrong ?
Syncer rate will only limit the re-sync rate when one side is out of sync such as the initial sync when first creating the resource. Normal uptodate/uptodate operations is to send writes as fast as the network and I/O subsystems will allow.
HTH
Jake