[DRBD-user] Linstor/DRBD9 : Initial sync stuck at 30Mbps

Yannis Milios yannis.milios at gmail.com
Mon May 6 17:37:51 CEST 2019

What happens if you temporarily disconnect the drbd resource in Primary
mode from the rest  during the "move" process? Does that speed up the
process ? If yes, then you will have to tune drbd sync parameters for the
10Gbit link.


On Mon, 6 May 2019 at 14:35, Julien Escario <julien.escario at altinea.fr>

> Hello,
> Sorry if this as already been answered : I check the archives and found
> similar issues with DRBD8 but none with linstor and DRBD9.
> This is not really a 'problem' but more a config/performance misconfig :
> when I 'move' a ressource from another storage backend to linstor
> storage on Proxmox, the sync is maxed at 3MB/s (completely flat).
> Drbdtop reports this :
> Sent: total:23.8MiB Per/Sec:3.0MiB
> Let me first confirm my hardware is (hopefully) capable of doing far
> more (10Gbps network and full SSD ZFS storage with nvme cache).
> So it seems I made a misconf somewhere.
> I tried to change a few values :
> # linstor controller drbd-options   --max-buffers=36864
> --rcvbuf-size=2097152   --sndbuf-size=1048576
> # linstor controller drbd-options   --c-fill-target=10240
> --c-max-rate=737280   --c-min-rate=20480   --c-plan-ahead=10
> That was described as optimal for 10Gbps network on some howtos I found.
> Just in case it wasn't applied on the fly, I ran drbdadm adjust on the
> resource (both nodes).
> Values are stored in /var/lib/linstor.d/linstor_common.conf file.
> No speed change in this sync.
> If I run 2 similar syncs at the same time, each of them is stuck at 3MB/s.
> What did I miss ?
> Best regards,
> Julien Escario
> _______________________________________________
> drbd-user mailing list
> drbd-user at lists.linbit.com
> http://lists.linbit.com/mailman/listinfo/drbd-user
Sent from Gmail Mobile
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.linbit.com/pipermail/drbd-user/attachments/20190506/5691e97c/attachment-0001.htm>

More information about the drbd-user mailing list