sar stops reporting metrics for some of the network interfaces after creation of a significant amount of (virtual) network interfaces in Red Hat Enterprise Linux 7
Issue
After creating a significant amount of virtual network interfaces during the day, sar stops reporting metrics for some of the existing network interfaces.
E.g., on an example system, sar initially stores the following interfaces:
10:00:01 PM IFACE rxpck/s txpck/s rxkB/s txkB/s rxcmp/s txcmp/s rxmcst/s
10:10:02 PM bond1 97.96 98.17 15.74 9.15 0.00 0.00 2.06
10:10:02 PM ens2 208.54 0.00 14.56 0.00 0.00 0.00 89.14
10:10:02 PM ens3 37.33 45.46 5.99 4.24 0.00 0.00 1.03
10:10:02 PM ovs-system 0.00 0.00 0.00 0.00 0.00 0.00 0.00
10:10:02 PM br-int 0.00 0.00 0.00 0.00 0.00 0.00 0.00
10:10:02 PM br-tun 0.00 0.00 0.00 0.00 0.00 0.00 0.00
10:10:02 PM bond0 0.00 0.00 0.00 0.00 0.00 0.00 0.00
10:10:02 PM eno49 208.53 0.00 14.56 0.00 0.00 0.00 89.11
10:10:02 PM ens2d1 4.02 0.00 0.27 0.00 0.00 0.00 2.03
10:10:02 PM ens3d1 14.10 11.81 1.32 7.93 0.00 0.00 2.04
10:10:02 PM lo 34.86 34.86 2.25 2.25 0.00 0.00 0.00
10:10:02 PM br-management 4.02 0.20 0.22 0.03 0.00 0.00 0.00
10:10:02 PM vlan1100 0.19 0.00 0.01 0.00 0.00 0.00 0.00
10:10:02 PM br-erogazione 210.09 0.00 11.79 0.00 0.00 0.00 0.00
10:10:02 PM vlan1050 95.97 96.17 14.19 8.91 0.00 0.00 0.00
10:10:02 PM vlan1000 5.08 6.05 0.37 6.91 0.00 0.00 0.00
10:10:02 PM eno49d1 60.63 52.71 9.74 4.92 0.00 0.00 1.03
10:10:02 PM docker0 0.00 0.00 0.00 0.00 0.00 0.00 0.00
10:10:02 PM vlan1001 6.31 5.46 0.60 0.98 0.00 0.00 0.00
...
09:10:01 AM bond1 176.91 154.45 319.02 14.97 0.00 0.00 2.06
09:10:01 AM ens2 34038475.36 0.02 91908598.36 0.00 0.00 0.00 1212470.95
09:10:01 AM ens3 580686.72 836561.23 93084.59 77674.73 0.00 0.00 13765.74
09:10:01 AM ovs-system 0.00 0.00 0.00 0.00 0.00 0.00 0.00
09:10:01 AM br-int 0.00 0.00 0.00 0.00 0.00 0.00 0.00
09:10:01 AM br-tun 0.00 0.00 0.00 0.00 0.00 0.00 0.00
09:10:01 AM bond0 0.00 0.00 0.00 0.00 0.00 0.00 0.00
09:10:01 AM eno49 34040730.65 0.03 91906792.77 0.00 0.00 0.00 1210627.87
09:20:01 AM vxlan_sys_4789 1438.08 1671.48 125.22 4751.02 0.00 0.00 0.00
09:20:01 AM bond1 1964416.44 1822526.48 301665.17 173774.66 0.00 0.00 46228.63
09:20:01 AM ens2 34054005.74 0.72 91949968.80 0.05 0.00 0.00 1213109.20
09:20:01 AM ens3 581252.10 837525.41 93599.92 79952.92 0.00 0.00 13772.96
09:20:01 AM ovs-system 0.00 0.00 0.00 0.00 0.00 0.00 0.00
09:20:01 AM br-int 0.00 0.00 0.00 0.00 0.00 0.00 0.00
09:30:01 AM vxlan_sys_4789 1034.13 741.20 680.13 2387.63 0.00 0.00 0.00
09:30:01 AM bond1 287.48 398.62 36.35 1790.59 0.00 0.00 2.06
09:30:01 AM ens2 219.51 1.06 15.41 0.08 0.00 0.00 95.46
09:30:01 AM ens3 98.10 212.40 12.57 973.32 0.00 0.00 1.03
09:30:01 AM ovs-system 0.00 0.00 0.00 0.00 0.00 0.00 0.00
09:30:01 AM br-int 0.00 0.00 0.00 0.00 0.00 0.00 0.00
09:40:01 AM vxlan_sys_4789 179.18 185.21 26.60 79.51 0.00 0.00 0.00
09:40:01 AM bond1 123.48 126.87 19.97 67.41 0.00 0.00 2.06
09:40:01 AM ens2 219.99 1.06 15.69 0.08 0.00 0.00 95.84
09:40:01 AM ens3 44.19 60.39 7.19 33.54 0.00 0.00 1.03
09:40:01 AM ovs-system 0.00 0.00 0.00 0.00 0.00 0.00 0.00
09:40:01 AM br-int 0.00 0.00 0.00 0.00 0.00 0.00 0.00
...
01:00:01 PM bond1 110.00 113.51 17.47 68.13 0.00 0.00 2.06
01:00:01 PM ens2 214.19 1.03 15.24 0.07 0.00 0.00 96.48
01:00:01 PM ens3 42.06 54.12 6.66 35.62 0.00 0.00 1.03
01:00:01 PM ovs-system 0.00 0.00 0.00 0.00 0.00 0.00 0.00
01:00:01 PM br-int 0.00 0.00 0.00 0.00 0.00 0.00 0.00
01:10:01 PM vxlan_sys_4789 7709.48 8119.80 1698.94 19468.74 0.00 0.00 0.00
01:10:01 PM bond1 1966836.64 1825147.16 311068.47 185706.07 0.00 0.00 46224.36
01:20:01 PM vxlan_sys_4789 254.82 262.30 34.47 179.97 0.00 0.00 0.00
01:20:01 PM bond1 118.21 123.10 27.96 99.25 0.00 0.00 2.06
01:30:01 PM vxlan_sys_4789 253.62 260.68 34.09 177.89 0.00 0.00 0.00
01:30:01 PM bond1 118.69 123.32 28.08 95.99 0.00 0.00 2.06
01:40:01 PM vxlan_sys_4789 251.32 257.85 33.77 174.81 0.00 0.00 0.00
01:40:01 PM bond1 119.06 123.99 24.23 93.28 0.00 0.00 2.06
01:50:01 PM vxlan_sys_4789 226.82 233.66 33.30 139.96 0.00 0.00 0.00
01:50:01 PM bond1 124.14 128.90 29.08 96.55 0.00 0.00 2.06
02:00:01 PM vxlan_sys_4789 250.09 261.49 34.17 179.35 0.00 0.00 0.00
02:00:01 PM bond1 127.41 132.35 29.13 99.02 0.00 0.00 2.06
02:10:01 PM vxlan_sys_4789 250.68 261.51 34.31 179.99 0.00 0.00 0.00
02:10:01 PM bond1 124.11 128.99 29.06 100.01 0.00 0.00 2.06
02:20:01 PM vxlan_sys_4789 249.35 257.36 34.10 176.00 0.00 0.00 0.00
02:20:01 PM bond1 119.45 124.10 28.22 94.86 0.00 0.00 2.06
02:30:01 PM vxlan_sys_4789 249.60 255.80 33.91 174.54 0.00 0.00 0.00
02:30:01 PM bond1 117.73 122.39 23.96 93.53 0.00 0.00 2.06
02:40:01 PM vxlan_sys_4789 10482.40 10967.06 2026.29 21786.23 0.00 0.00 0.00
...
During the day, many virtual interfaces are created and sar from this moment on only reports those virtual interfaces:
09:50:01 PM qvb4a0a4c7c-89 0.53 0.02 0.04 0.00 0.00 0.00 0.00
09:50:01 PM qvo4a0a4c7c-89 0.02 0.53 0.00 0.04 0.00 0.00 0.00
09:50:01 PM qvbfa204299-07 27.63 26.58 37.76 1.21 0.00 0.00 0.00
09:50:01 PM qvofa204299-07 26.58 27.63 1.21 37.76 0.00 0.00 0.00
09:50:01 PM tapc630c03b-bb 0.04 3.24 0.00 0.22 0.00 0.00 0.00
09:50:01 PM qbref4f5ac7-68 3.46 0.00 0.19 0.00 0.00 0.00 0.00
09:50:01 PM tap9c679ada-f9 0.04 3.24 0.00 0.22 0.00 0.00 0.00
09:50:01 PM vxlan_sys_4789 582.06 593.47 47.68 642.40 0.00 0.00 0.00
09:50:01 PM tapeabbe9d7-82 0.04 2.94 0.00 0.42 0.00 0.00 0.00
09:50:01 PM tap8ab3368a-bb 0.04 0.52 0.00 0.04 0.00 0.00 0.00
09:50:01 PM tapdec2a999-10 1.01 2.26 0.06 0.16 0.00 0.00 0.00
09:50:01 PM qvb9743aafe-e2 3.45 0.02 0.24 0.00 0.00 0.00 0.00
09:50:01 PM qvo9743aafe-e2 0.02 3.45 0.00 0.24 0.00 0.00 0.00
09:50:01 PM tap98516bf7-bf 0.03 0.52 0.00 0.04 0.00 0.00 0.00
09:50:01 PM qvb69e975f4-f8 0.52 0.04 0.04 0.00 0.00 0.00 0.00
09:50:01 PM qvo69e975f4-f8 0.04 0.52 0.00 0.04 0.00 0.00 0.00
09:50:01 PM qvba4d6c7f9-35 9.55 0.04 0.63 0.00 0.00 0.00 0.00
09:50:01 PM qvoa4d6c7f9-35 0.04 9.55 0.00 0.63 0.00 0.00 0.00
09:50:01 PM qvb26868e69-29 2.95 0.03 0.42 0.00 0.00 0.00 0.00
09:50:01 PM qvo26868e69-29 0.03 2.95 0.00 0.42 0.00 0.00 0.00
09:50:01 PM tap72256b30-a2 0.04 2.94 0.00 0.42 0.00 0.00 0.00
Environment
- Red Hat OpenStack Platform 13.0 (RHOSP)
- Red Hat Enterprise Linux 7.x (RHEL)
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