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

[Yannis Milios]

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.

G.

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

> 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
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