Re: Deadly slow Ceph cluster revisited

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May I suggest checking also the error counters on your network switch?

Check speed and duplex. Is bonding in use?  Is flow control on?  Can you swap the network cable?  Can you swap a NIC with another node and does the problem follow?

Hth, Alex

On Friday, July 17, 2015, Steve Thompson <smt@xxxxxxxxxxxx> wrote:
On Fri, 17 Jul 2015, J David wrote:

f16 inbound: 6Gbps
f16 outbound: 6Gbps
f17 inbound: 6Gbps
f17 outbound: 6Gbps
f18 inbound: 6Gbps
f18 outbound: 1.2Mbps

Unless the network was very busy when you did this, I think that 6 Gb/s may not be very good either. Usually iperf will give you much more than that. For example, between two of my OSD's, I get 9.4 Gb/s, or up to 9.9 Gb/s when nothing else is happening.

Steve
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