Afaik the swapping behavior is controlled by the kernel, there might be some tweaks on the container engine side, but you might want to try to tweak the default behavior by lowering the 'vm.swapiness' of the kernel:
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/performance_tuning_guide/s-memory-tunables On 08/16 13:14, Alexander Sporleder wrote: > Hello list! > We have a containerized Pacific (16.2.5) Cluster running CentOS 8.4 and after > a few weeks the OSDs start to use swap > quite a lot despite free memory. The host has 196 GB of memory and 24 OSDs. > "OSD Memory Target" is set to 6 GB. > > > > $ cat /proc/meminfo > MemTotal: 196426616 kB > MemFree: 11675608 kB > MemAvailable: 48940232 kB > Buffers: 46757632 kB > Cached: 653216 kB > .... > > > $ smem -k > Command Swap USS PSS > RSS > ceph /usr/bin/ceph-osd -n osd.22 1.7G 3.7G 3.7G 3.7G > ceph /usr/bin/ceph-osd -n osd.10 853.4M 4.6G 4.6G 4.6G > ceph /usr/bin/ceph-osd -n osd.12 793.6M 4.6G 4.6G 4.6G > ceph /usr/bin/ceph-osd -n osd.92 561.3M 4.7G 4.7G 4.7G > ceph /usr/bin/ceph-osd -n osd.14 647.2M 4.9G 4.9G 4.9G > ceph /usr/bin/ceph-osd -n osd.15 567.8M 5.0G 5.0G 5.0G > .... > > > Is that a known behavior, an bug or configuration problem? On two hosts I > turned of swap and the OSDs a running happily > now for more the 6 weeks. > > Bets, > Alex > > _______________________________________________ > ceph-users mailing list -- ceph-users@ceph.io > To unsubscribe send an email to ceph-users-le...@ceph.io -- David Caro SRE - Cloud Services Wikimedia Foundation <https://wikimediafoundation.org/> PGP Signature: 7180 83A2 AC8B 314F B4CE 1171 4071 C7E1 D262 69C3 "Imagine a world in which every single human being can freely share in the sum of all knowledge. That's our commitment."
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