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Issue Description MDM keeps flapping between DEGRADED and NORMAL states. Other services (SDS, SDC) running on the same host can also be affected. Scenario The issue can happen during normal operations. Symptoms Affected host /var/log/messages are showing: Mar 8 06:32:00 sds4-4 kernel: i40e 0000:0a:00.0: TX driver issue detected, PF reset issued Mar 8 06:32:01 sds4-4 kernel: i40e 0000:0a:00.0: i40e_ptp_init: added PHC on ens3f0 Mar 8 06:32:01 sds4-4 kernel: i40e 0000:0a:00.0: enabling bridge mode: VEPA Mar 8 06:32:01 sds4-4 kernel: i40e 0000:0a:00.0 ens3f0: NIC Link is Up 10 Gbps Full Duplex, Flow Control: None Mar 8 06:32:01 sds4-4 kernel: i40e 0000:0a:00.0: TX driver issue detected, PF reset issued Mar 8 06:32:02 sds4-4 kernel: i40e 0000:0a:00.0: i40e_ptp_init: added PHC on ens3f0 Mar 8 06:32:02 sds4-4 kernel: i40e 0000:0a:00.0: enabling bridge mode: VEPA Mar 8 06:32:02 sds4-4 kernel: i40e 0000:0a:00.0 ens3f0: NIC Link is Up 10 Gbps Full Duplex, Flow Control: None Mar 8 06:32:02 sds4-4 kernel: i40e 0000:0a:00.0: TX driver issue detected, PF reset issued Mar 8 06:32:03 sds4-4 kernel: i40e 0000:0a:00.0: i40e_ptp_init: added PHC on ens3f0 Mar 8 06:32:03 sds4-4 kernel: i40e 0000:0a:00.0: enabling bridge mode: VEPA Mar 8 06:32:03 sds4-4 kernel: i40e 0000:0a:00.0 ens3f0: NIC Link is Up 10 Gbps Full Duplex, Flow Control: None Impact The stability of ScaleIO services running on the host can be affected.
Root cause The problem caused by the software issue with the NIC driver built into the Linux kernel
Workaround Disable both the TSO and GSO offloading functions: # ethtool -K ethX tso off gso off For a permanent fix, upgrade the kernel to kernel-3.10.0-514.17.1.el7 or later (see: https://access.redhat.com/solutions/2943651)
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