[DRBD-user] DRBD9 sync speed

Piero Baudino pbaudino at formatnet.it
Sun Jun 19 08:56:18 CEST 2016

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

Hi all,

I have a cluster with 2 PVE servers with DRBD9.
The replicated volume is about 7 Tb, the disks are 7200 rpm near line SAS.
The communications channel for DRBD9 is done via 4 Gbit dedicated 
network cards in bond configuration (round robbin).
I have created a VM with 1 Tb disk for test purpuse in the DRBD volume.
After that, DRBD starts sync...
The sync speed is about 10 Mbyte/sec
The effective network speed misured with IPERF is about 3,6 Gbit/sec

Is there a way to increse sync speed ?
All the docs about this topic are related to 8.x.y DRBD version....

Thanks all!

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