> Read the above link again, carefully. ^o^
> In in it I state that:
> a) despite reading such in old posts, setting read_ahead on the OSD
> nodes
> has no or even negative effects. Inside the VM, it is very helpful:
> b) the read speed increased about 10 times, from 35MB/s to 380MB/s
Christian, are you getting 380MB/s from hdd osds or ssd osds? It seems a bit
high for a single thread cold data throughput.
Cheers
> Regards,
> Christian
> > # set read_ahead values
> > ACTION=="add|change", KERNEL=="sd[a-z]",
> > ATTR{queue/rotational}=="1",
> > ATTR{queue/read_ahead_kb}="2048" ACTION=="add|change",
> > KERNEL=="sd[a-z]", ATTR{queue/rotational}=="1",
> > ATTR{queue/nr_requests}="2048" # set deadline scheduler for
> > non-rotating
> > disks ACTION=="add|change", KERNEL=="sd[a-z]",
> > ATTR{queue/rotational}=="0", ATTR{queue/scheduler}="noop" # # set
> > cfq
> > scheduler for rotating disks ACTION=="add|change",
> > KERNEL=="sd[a-z]",
> > ATTR{queue/rotational}=="1", ATTR{queue/scheduler}="cfq"
> >
> > Is there anything else that I am missing?
> --
> Christian Balzer Network/Systems Engineer
> ch...@gol.com Global OnLine Japan/Fusion Communications
> http://www.gol.com/
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