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It is important to review the load average and iowait, if we see this values are high that represents problems for the server
List of processes
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OMK recommends executing the command in the following way, since this gives a better scenario than what happens with the disks.
Example: the command shows 5 samples made every 3 seconds, what we want is that at least 3 of the samples reflect data within the stable range for the server, otherwise this indicates that there is a problem with the disks.
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[root@opmantek ~]# iostat -xtc 3 5
Linux 2.6.32-754.28.1.el6.x86_64 (opmantek) 04/05/2021 _x86_64_ (8 CPU)
04/05/2021 09:23:40 PM
avg-cpu: %user %nice %system %iowait %steal %idle
12.47 0.00 0.73 10.53 0.00 86.72
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await r_await w_await svctm %util
sda 0.00 0.00 4.50 35.50 148.00 452.00 15.00 110.98 4468.74 274.22 5000 0.60 100.00
sdb 0.00 42.50 0.00 6.50 0.00 392.00 60.31 0.13 20.00 0.00 20 0.34 92.12
dm-0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0 0.65 56.00
dm-1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0 0.86 10.50
dm-2 0.00 0.00 4.50 52.00 140.00 416.00 9.84 149.56 5229.59 274.22 5658 0.21 25.03
dm-3 0.00 0.00 0.00 0.50 0.00 4.00 8.00 66.00 0.00 0.00 0 0.45 14.40
04/05/2021 09:23:43 PM
avg-cpu: %user %nice %system %iowait %steal %idle
18.17 0.00 5.29 6.31 0.00 76.82
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await r_await w_await svctm %util
sda 0.00 50.00 9.50 19.00 596.00 260.00 30.04 130.41 2569.47 283.11 3712 0.60 92.36
sdb 0.00 36.50 0.50 59.00 8.00 764.00 12.97 25.34 425.82 18.00 429 0.25 78.82
dm-0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0 0.23 92.45
dm-1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0 0.86 88.93
dm-2 0.00 0.00 8.00 163.50 440.00 1308.00 10.19 240.76 966.94 337.38 997 0.37 68.28
dm-3 0.00 0.00 0.00 33.00 0.00 264.00 8.00 48.31 0.00 0.00 0 0.18 12.75
04/05/2021 09:23:46 PM
avg-cpu: %user %nice %system %iowait %steal %idle
2.50 0.00 1.21 11.37 0.00 75.56
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await r_await w_await svctm %util
sda 0.00 0.00 9.50 18.00 268.00 220.00 17.75 112.91 1763.73 143.42 2618 0.85 100.00
sdb 0.00 10.00 2.00 1.50 112.00 92.00 58.29 0.01 3.86 6.25 0 0.94 97.54
dm-0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0 0.45 75.39
dm-1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0 0.78 24.96
dm-2 0.00 0.00 13.50 11.50 552.00 92.00 25.76 185.21 3029.96 101.85 6467 0.25 67.18
dm-3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0 0.86 43.91
04/05/2021 09:23:49 PM
avg-cpu: %user %nice %system %iowait %steal %idle
12.10 0.00 7.21 9.17 0.00 87.92
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await r_await w_await svctm %util
sda 0.00 55.50 7.00 44.00 92.00 488.00 11.37 110.52 929.20 139.86 1054 0.75 89.54
sdb 0.00 65.00 0.50 34.00 4.00 792.00 23.07 0.83 24.09 1.00 24 0.55 93.61
dm-0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0 0.14 99.99
dm-1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0 0.36 78.98
dm-2 0.00 0.00 7.00 242.50 84.00 1940.00 8.11 179.44 240.22 137.36 243 0.75 25.30
dm-3 0.00 0.00 0.00 5.00 0.00 40.00 8.00 1.30 305.90 0.00 305 0.23 45.12
04/05/2021 09:23:52 PM
avg-cpu: %user %nice %system %iowait %steal %idle
9.50 0.00 11.21 19.30 0.00 92.92
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await r_await w_await svctm %util
sda 0.16 114.34 7.02 191.18 132.04 2444.27 13.00 3.60 18.18 81.41 15 0.14 99.99
sdb 0.03 205.87 2.36 70.03 31.22 2207.55 30.92 5.81 80.25 53.76 81 0.94 97.54
dm-0 0.00 0.00 0.10 1.01 11.77 8.07 17.90 0.84 755.10 72.31 822 0.60 98.36
dm-1 0.00 0.00 0.09 0.13 0.74 1.03 8.00 0.22 985.66 153.25 1580 0.47 94.48
dm-2 0.00 0.00 9.25 575.59 129.18 4604.83 8.09 6.09 9.74 74.24 8 0.61 82.37
dm-3 0.00 0.00 0.12 4.74 21.57 37.89 12.24 2.52 518.00 131.58 527 0.23 93.15
[root@opmantek ~]#
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