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Full Discussion: Iostat and top command
Operating Systems Linux Red Hat Iostat and top command Post 302974882 by manoj.solaris on Sunday 5th of June 2016 01:35:24 PM
Old 06-05-2016
Iostat and top command
I am facing strange behaviour of iostat command and top command. where initially it is showing high utilization and after it is showing low utilization.

iostat command

Code:
avg-cpu: %user %nice %system %iowait %steal %idle
 73.60 0.01 23.93 0.92 0.00 1.54

 Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util
 sda 0.00 0.35 0.09 0.50 2.04 10.50 21.30 0.00 1.29 0.19 0.01
 sdb 0.04 3.07 0.27 4.12 8.20 73.39 18.62 0.00 0.69 0.18 0.08
 sdc 0.26 0.46 0.31 7.42 155.19 850.85 130.10 0.07 9.00 0.40 0.31
 sdd 0.00 0.00 2.40 1.00 5.73 1.01 1.98 0.00 0.38 0.37 0.13
 sdf 0.00 0.00 2.40 1.00 5.74 1.01 1.98 0.00 0.38 0.37 0.13
 sde 0.00 0.00 2.40 1.00 5.74 1.01 1.98 0.00 0.38 0.37 0.13
 sdg 0.00 0.01 10.20 4.58 529.39 159.60 46.63 0.01 0.84 0.45 0.67
 sdh 0.08 0.16 63.83 63.13 4792.88 1946.14 53.08 0.15 1.17 0.23 2.92
 sdi 0.00 0.01 0.93 0.26 236.48 260.57 420.04 0.03 25.61 0.67 0.08

 avg-cpu: %user %nice %system %iowait %steal %idle
 0.89 0.00 0.76 0.00 0.00 98.35

 Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util
 sda 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
 sdb 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
 sdc 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
 sdd 0.00 0.00 2.00 1.00 2.00 1.00 1.00 0.00 0.33 0.33 0.10
 sdf 0.00 0.00 2.00 1.00 2.00 1.00 1.00 0.00 0.33 0.33 0.10
 sde 0.00 0.00 2.00 1.00 2.00 1.00 1.00 0.00 0.33 0.33 0.10
 sdg 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
 sdh 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
 sdi 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

 avg-cpu: %user %nice %system %iowait %steal %idle
 2.15 0.00 0.63 0.00 0.00 97.22

 Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util
 sda 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
 sdb 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
 sdc 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
 sdd 0.00 0.00 2.00 1.00 2.00 1.00 1.00 0.00 0.67 0.67 0.20
 sdf 0.00 0.00 2.00 1.00 2.00 1.00 1.00 0.00 0.33 0.33 0.10
 sde 0.00 0.00 2.00 1.00 2.00 1.00 1.00 0.00 0.33 0.33 0.10
 sdg 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
 sdh 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
 sdi 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00



top
Code:
 top - 11:15:06 up 16 days, 19:04, 3 users, load average: 0.18, 0.24, 0.23
 Tasks: 260 total, 1 running, 259 sleeping, 0 stopped, 0 zombie
 Cpu(s): 51.1%us, 34.6%sy, 0.3%ni, 11.5%id, 2.1%wa, 0.0%hi, 0.5

but after a while it is showing low.

Code:
top - 11:15:59 up 16 days, 19:05, 3 users, load average: 0.26, 0.25, 0.23
 Tasks: 259 total, 1 running, 258 sleeping, 0 stopped, 0 zombie
 Cpu(s): 0.5%us, 0.3%sy, 0.0%ni, 99.2%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st

I have checked /var/log/messages, can not found any issues.

using oracle Linux 6.7
Last edited by jim mcnamara; 06-05-2016 at 03:52 PM.. Reason: code tags! please
 

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