[DRBD-user] drbd resource write performance and sync speeds

Ralf Gross Ralf-Lists at ralfgross.de
Thu Apr 10 14:33:09 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.

Christian Balzer schrieb:
> On Wed, 9 Apr 2008 10:49:57 +0200 Ralf Gross wrote:
> > In a test with 2 x GbE crossover connections, I was able to achive
> > ~170 MB/s with the netpipe benchmark. I didn't test this with drbd,
> > but other daemons (smbd, vsftp) didn't show a huge impovement from his
> > raw speed gain. The limit was always ~80 MB/s.
> >
> That netpipe result matches mine here, I think I used a proftpd server
> for raw transfer tests (with ssh/scp the CPU was always the limiting
> factor) and it was definitely over the speed of a single link. But then
> again these machines have 24GB RAM, so could transfer the 8GB test file
> without ever hitting the disks. So maybe your 80MB/s are more related to
> your storage system bandwidth? 

No, dsik write speed was ~170 MB/s. With dd over netcat I was able to
get the netpipe throughput. Samba doesn't scale very well I think...


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