On 12/16/2014 07:08 PM, Christian Balzer wrote:
On Tue, 16 Dec 2014 16:26:17 +0000 VELARTIS Philipp Dürhammer wrote:
Hello,
Read speed inside our vms (most of them windows) is only ¼ of the write
speed. Write speed is about 450MB/s - 500mb/s and
Read is only about 100/MB/s
Our network is 10Gbit for OSDs and 10GB for MONS. We have 3 Servers with
15 osds each
Basically what David Clarke wrote, it has indeed been discussed several
times.
Find my "The woes of sequential reads" thread, it has data and a link to a
blueprint that is attempting to fix this on the Ceph side.
Unfortunately I don't think there has been any progress with this.
Christian
Yeah read ahead definitely seems to help quite a bit. I've been
wondering now with the work going into improving random read performance
on SSDs if we are going to pay for it sooner or later, but so far
increasing readahead seems to typically be a win.
Mark
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