[DRBD-user] Diagnosing DRBD Slowness

Peter Sabaini peter at sabaini.at
Tue Oct 21 22:55:34 CEST 2008

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


On Tuesday 21 October 2008 22:44:46 Robinson, Eric wrote:
> Ben Clewett said:
> > # drbdadm adjust
>
> This is fantastic. It took 3 days to sync 12.5%, but now in the past 10
> minutes since the change, it has jumped to 27%. I'm happy as can be.
>
> Thanks are definitely in order.
>
> I'm still puzzled about the output of the dd command, though...
>
> [root at ha03 download]# dd if=/dev/zero bs=1M count=100 | nc 2.1.1.1 10000
> 10+0 records in
> 9+0 records out
> 9437184 bytes (9.4 MB) copied, 27.7838 seconds, 340 kB/s
>
> The numbers look pretty much the same whether I connect from nc to nc on
> different hosts or the same host.

Yup seems odd...
FWIW I get around 3.3Mb/s when using nc on my box' external IP, 127.0.0.1, or 
a Unix Socket.

peter.


> --Eric
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