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="" KERNEL=="sd[a-z]", ATTR{queue/rotational}=="1",
> ATTR{queue/read_ahead_kb}="2048" ACTION="">> KERNEL=="sd[a-z]", ATTR{queue/rotational}=="1",
> ATTR{queue/nr_requests}="2048" # set deadline scheduler for non-rotating
> disks ACTION="" KERNEL=="sd[a-z]",
> ATTR{queue/rotational}=="0", ATTR{queue/scheduler}="noop" # # set cfq
> scheduler for rotating disks ACTION="" 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
chibi@xxxxxxx Global OnLine Japan/Fusion Communications
http://www.gol.com/
_______________________________________________
ceph-users mailing list
ceph-users@xxxxxxxxxxxxxx
http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
_______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
