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@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@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@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