[CentOS] Slow terminal response Centos 7.7 1908

Fri Jul 3 15:48:30 UTC 2020
Erick Perez - Quadrian Enterprises <eperez at quadrianweb.com>

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
> ---------------------
>


-- 

---------------------
Erick Perez
Quadrian Enterprises S.A. - Panama, Republica de Panama
Skype chat: eaperezh
WhatsApp IM: +507-6675-5083
---------------------