Check NUMA status in bios'es. Sometimes linux do swap instead of task
transfer between numa nodes (inside one host).
Set "interleave" or "disable" to see difference.
On 07/27/2016 11:21 AM, Kenneth Waegeman wrote:
Hi all,
When our OSD hosts are running for some time, we start see increased
usage of swap on a number of them. Some OSDs don't use swap for weeks,
while others has a full (4G) swap, and start filling swap again after
we did a swapoff/swapon.
We have 8 8TB OSDS and 2 cache SSDs on each hosts, and 80GB of Memory.
There is still about 15-20GB memory available when this happens.
Running Centos7; We had swapiness set to 0. There is no client io
right now, only scrubbing. some OSDs are using 20-80% of cpu.
Has somebody seen this behaviour? It doesn't have to be bad, but what
could explain some hosts keep on swapping, and others don't?
Could this be some issue?
Thanks !!
Kenneth
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