[DRBD-user] Really, Really Slow or Misunderstanding?

[knebb at knebb.de]

Hi all,


all back!

I just realized the line does not offer 19Mbit/s but instead only
4Mbit/s and then the value is to be expected.


Sorry for confusion!


/Christian


Am 31.07.2019 um 06:48 schrieb knebb at knebb.de:
> Hi all,
>
>
> I have a drbd device set up and it looks like it is running fine so far.
> Just when watching /proc/drbd the resync seems to be really, really slow:
>
> version: 8.4.11-1 (api:1/proto:86-101)
> GIT-hash: 66145a308421e9c124ec391a7848ac20203bb03c build by mockbuild@,
> 2018-11-03 01:26:55
>
>  1: cs:SyncTarget ro:Secondary/Secondary ds:Inconsistent/UpToDate A r-----
>     ns:0 nr:285164 dw:285044 dr:0 al:0 bm:0 lo:2 pe:2 ua:2 ap:0 ep:1
> wo:f oos:314127936
>         [>....................] sync'ed:  0.1% (306764/307004)M
>         finish: 188:23:50 speed: 444 (424) want: 1,160 K/sec
>
>
> I have not added any special settings to my drbd setup, the *.conf file
> just hass all setting marekedd out with "#". And the device file has the
> following:
>
> resource drbd1 {
>   protocol A;
>   startup {become-primary-on backuppc2;}
>   on backuppc1 {
>     device /dev/drbd1;
>     disk /dev/vdb;
>     address 192.168.9.1:7789;
>     meta-disk internal;
>   }
>   on backuppc2 {
>     device /dev/drbd1;
>     disk /dev/sdb;
>     address 192.168.1.1:7789;
>     meta-disk internal;
>   }
> }
>
> As it runs over a slow WAN connection (the line is 10Mbit ) I do not
> expect the transfer rate to be very high. But most of the time just
> 444K/sec? There is no really impressive other traffic on the line and a
> bandwidth calculator tells me it should be done (for the approx
> 307.000MB) within close three days. But 188 hours are triple of the
> calculated time!
>
> Oh, and on the device itself there is nearly no IO at this stage.
>
> Is there some miscalculation or misreading of the values from
> /proc/drbd? How can I speed up the sync?
>
>
>
> Thanks a lot!
>
>
> /Christian
>
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