Hi Erick, what was the value of 'si' in top ? Best Regards, Strahil Nikolov На 3 юли 2020 г. 18:48:30 GMT+03:00, Erick Perez - Quadrian Enterprises <eperez at quadrianweb.com> написа: >It was found that the software NIC team created in Centos was having >issues due to a failing network cable. The team was going berserk with >up/down changes. > > >On Fri, Jul 3, 2020 at 10:12 AM Erick Perez - Quadrian Enterprises < >eperez at quadrianweb.com> wrote: > >> Hey! >> I have a strange condition in one of the servers that I don't where >to >> start looking. >> I login to the server via SSH (cant doit any other way) and anything >that >> I type is slow >> HTTP sessions timeout waiting for screen redraw. So, the server is >acting >> "slow". >> >> server is bare metal. no virtual services. >> no alarms in the disk raid >> >> note: server was restarted because of power failure. >> >> Some outputs from this server that is a mail server: >> [root at correo ~]# top >> top - 09:54:43 up 23:51, 2 users, load average: 0.18, 0.23, 0.28 >> Tasks: 210 total, 1 running, 209 sleeping, 0 stopped, 0 zombie >> %Cpu(s): 0.2 us, 0.1 sy, 0.0 ni, 99.8 id, 0.0 wa, 0.0 hi, 0.0 >si, >> 0.0 st >> KiB Mem : 32606084 total, 25106412 free, 5932244 used, 1567428 >buff/cache >> KiB Swap: 16449532 total, 16449532 free, 0 used. 26282624 >avail Mem >> >> **iostat** >> [root at correo ~]# iostat -y 5 >> Linux 3.10.0-1062.12.1.el7.x86_64 (correo.binal.ac.pa) 07/03/2020 >> _x86_64_ (4 CPU) >> >> avg-cpu: %user %nice %system %iowait %steal %idle >> 0.05 0.00 0.05 0.05 0.00 99.85 >> >> Device: tps kB_read/s kB_wrtn/s kB_read >kB_wrtn >> sda 0.00 0.00 0.00 0 >0 >> dm-0 0.00 0.00 0.00 0 >0 >> dm-1 0.00 0.00 0.00 0 >0 >> >> avg-cpu: %user %nice %system %iowait %steal %idle >> 0.05 0.00 0.05 0.05 0.00 99.85 >> >> Device: tps kB_read/s kB_wrtn/s kB_read >kB_wrtn >> sda 21.40 0.00 169.60 0 >848 >> dm-0 21.40 0.00 169.60 0 >848 >> dm-1 0.00 0.00 0.00 0 >0 >> >> avg-cpu: %user %nice %system %iowait %steal %idle >> 0.60 0.00 0.05 0.45 0.00 98.90 >> >> Device: tps kB_read/s kB_wrtn/s kB_read >kB_wrtn >> sda 1.20 16.80 0.00 84 >0 >> dm-0 1.20 16.80 0.00 84 >0 >> dm-1 0.00 0.00 0.00 0 >0 >> >> avg-cpu: %user %nice %system %iowait %steal %idle >> 0.05 0.00 0.00 0.05 0.00 99.90 >> >> Device: tps kB_read/s kB_wrtn/s kB_read >kB_wrtn >> sda 8.00 0.00 100.20 0 >501 >> dm-0 9.00 0.00 100.20 0 >501 >> dm-1 0.00 0.00 0.00 0 >0 >> >> avg-cpu: %user %nice %system %iowait %steal %idle >> 0.45 0.00 0.35 0.05 0.00 99.15 >> >> Device: tps kB_read/s kB_wrtn/s kB_read >kB_wrtn >> sda 1.00 0.80 3.20 4 >16 >> dm-0 1.00 0.80 3.20 4 >16 >> dm-1 0.00 0.00 0.00 0 >0 >> >> >> **dstop** >> [root at correo ~]# dstat -cd --disk-util --disk-tps >> ----total-cpu-usage---- -dsk/total- sda- -dsk/total- >> usr sys idl wai hiq siq| read writ|util|reads writs >> 1 0 99 0 0 0| 20k 17k|0.14| 1 1 >> 0 0 100 0 0 0| 0 0 | 0| 0 0 >> 0 0 100 0 0 0| 0 0 | 0| 0 0 >> 0 0 100 0 0 0| 0 0 | 0| 0 0 >> 0 0 100 0 0 0| 0 0 | 0| 0 0 >> 0 0 100 0 0 0| 0 0 | 0| 0 0 >> 4 0 84 11 0 0|2512k 228k|52.3| 123 2 >> 31 4 58 7 0 0|1912k 1026k|38.1| 132 23 >> 0 0 99 0 0 0| 0 0 | 0| 0 0 >> 1 0 99 1 0 0|4096B 3819k|22.5| 1 270 >> 0 0 100 0 0 0| 0 0 | 0| 0 0 >> 13 1 83 4 0 0| 148k 2304k|15.3| 18 214 >> 1 0 98 1 0 0| 140k 499k|9.70| 14 8 >> 26 5 69 0 0 0| 0 1260k|1.30| 0 46 >> 56 7 38 0 0 0| 0 204k|0.30| 0 12 >> 14 11 75 0 0 0| 0 0 | 0| 0 0 >> 22 10 68 0 0 0| 0 0 | 0| 0 0 >> 16 10 71 3 0 0| 192k 37k|14.0| 12 2 >> 0 0 100 0 0 0| 0 0 | 0| 0 0 >> 0 0 100 0 0 0| 0 152k| 0| 0 2 >> 0 0 100 0 0 0| 0 0 | 0| 0 0 >> 1 1 98 1 0 0| 16k 2569k|14.8| 1 207 >> 1 1 98 0 0 0|4096B 0 |1.10| 1 0 >> 1 0 99 0 0 0| 0 0 | 0| 0 0 >> 0 0 100 0 0 0| 0 600k|1.30| 0 51 >> 2 0 98 0 0 0| 0 0 | 0| 0 0 >> 4 0 96 0 0 0| 0 0 | 0| 0 0 >> 0 0 100 0 0 0| 0 0 | 0| 0 0 >> >> >> >> -- >> >> --------------------- >> Erick Perez >> --------------------- >>