I'm troubleshooting some (custom) replication lag from dbproxy1004 (AKA m4-master) to dbstore1002 (AKA analytics-store). I just looked at syslog, and for days, this error has been repeating:
Jan 13 19:39:07 dbproxy1004 kernel: [29034022.584596] EDAC MC0: 1 CE error on CPU#0Channel#0_DIMM#0 (channel:0 slot:0 page:0x0 offset:0x0 grain:8 syndrome:0x0)
It doesn't seem to be causing any functional problems (CE == correctable error(?)), but it is probably something that needs fixed, ja? Perhaps this is causing slow downs in the SELECTs done on this MySQL instance for the custom replication?