[DRBD-user] link aggregate ( bonding module )
dbourque at weatherdata.com
Tue Apr 21 20:19:13 CEST 2009
My disk writes are benching 2x faster than the GigE dedicated link
connecting the DRBD nodes.
[root at host1 ]# ./Bonnie -s 1000 -d /var/tmp/
Bonnie 1.4: File '/var/tmp//Bonnie.9328', size: 1048576000, volumes: 1
Writing with putc()... done: 50862 kB/s 99.7 %CPU
Rewriting... done: 732229 kB/s 100.0 %CPU
Writing intelligently... done: 248780 kB/s 54.9 %CPU
Reading with getc()... done: 43119 kB/s 99.9 %CPU
Reading intelligently... done: 2002381 kB/s 99.9 %CPU
Thus, the DRBD link creates a bottleneck for disk writes. I would like
to use 802.3ad Dynamic link aggregation but looks like DRBD works off 2
unidirectional tcp/ip sessions, making it unable to max out the 2 gigE link.
Does anyone have any suggestion ( other than buying a pair of 10gigE
NICs ) ?
Sr. Systems Engineer
WeatherData Service Inc
An Accuweather Company
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