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Questions tagged [iostat]

iostat displays the current CPU load average and disk I/O information.

iostat (input/output statistics) is a computer system monitor tool used to collect and show operating system storage input and output statistics.

The iostat command is used for monitoring system input/output device loading by observing the time the devices are active in relation to their average transfer rates. The iostat command generates reports that can be used to change system configuration to better balance the input/output load between physical disks.

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Script for monitoring disk i/o rates on Linux

I need a for monitoring ALL disk i/o rates on Linux using bash, awk, sed. The problem is that it must return one row per time interval (so this one row should contain: tps, kB_read/s, kB_wrtn/s, kB_read, kB_wrtn, but summarized per all…
Krzysztof Bober
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Analyzing iostat output

I'm suffering performance issues with my application, and one of my suspects is excessive IO. iostat shows rate of 10K blocks written per second. How can I tell if this is a lot or not? How can I know the limit of the specific machine and…
duduamar
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IOstat or Pidstat not giving any information under the Headers

I am trying to monitor the IO usage during a Java application is executed, however, when I used iostat/vmstat/pidstat I am not seeing any information under the header, it's completely empty. Advise me on this issue. pidstat iostat Note - I am…
Muthu Raman
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rrqm/s always zero when doing sequential test using fio command

When running fio command to do sequential IO test, I found rrqm/s in iostat report always show zero, which means there is no merge. But avgrq-sz is not what I set in fio options(-bs=256k), only about 177k. fio -directory=/data -direct=1 -iodepth=16…
Zhiheng Sun
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How can iostat utilization be 100% with a queue size of < 1

Consider understanding the performance of a C program which writes blocks between 12 and 16 KiB to a few files sequentially within each file. It produces the following iostat -x line1 from a one second interval for a disk under a fairly heavy load…
BeeOnRope
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Problemas reading a CSV file, IOSTAT=5010, gfortran

I'm in trouble while reading a CSV file with about 2 Gb: OPEN(unit=11,status='OLD',file=fin,form='formatted') IEND=0 n=0 DO n=n+1 READ(11,*,IOSTAT=iEND1) RECORD IF (IEND==0) THEN deal with RECORD …
Mario
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How to get the Jmeter Server Agent to collect IOStats

I have Jmeter serveragent running with sudo privileges [sudo ./startAgent.sh --interval 1] on my server where I am trying to collect IO Stats using EXEC metric During the jmx run (GUI Mode for verification) the Server Agent throws error as…
Xsudo
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Linux DB2 server exhibit extreme load

We have a DB2 Server running on a SLES 11 server (novell) on x64 and every once in a while it will exhibit extreme load... and by extreme im mostly being conservative. This server has 256GB or RAM and 8 cpu cores ( 4x2 cores cpu) and today it…
Patrick
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Bash - delimeter to cut field differing spacing

Im cutting CPU usage statistics within a bash file and presenting it formatted, from iostat there are multiple fields but only user, system and idle are relevant as shown in the following: echo "" `iostat -c | awk 'NR==3' | cut -d '%' -f…
null.ts
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parse iostat output using awk

I'm trying to filter the output of the parameter avgserv from the read line, using awk. The default output of my iostat command: iostat -D hdisk0 is as follow: bash-4.4$ iostat -D hdisk0 System configuration: lcpu=32 drives=9 paths=126…
edwio
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Linux iostat "averaged" result over a period of time

I am using the iostat utility on my RedHat Linux server to monitor the performance of a disk. When I use "iostat -xd sdh 1", I get the perf result printed every one second. When I use "iostat -xd sdh 5", I get the perf result printed every five…
Ahmed A
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How to output state into multiple text in script of Linux?

I have multiple servers of Linux, where I need to test the performance of my program, here I want to output the system state when running programs. In script of linux, I use following to output: top -b -d 5 > System.txt iostat -d 8 > IO.txt But…
Andi
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iostat -k in Solaris (SunOS 5.10)

In Linux iostat -k displays kB_read kB_wrtn fields, which are total data read/written during the measured interval. #iostat -k Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn sda 0.59 3.69 10.46 …
vasiliy rur
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Process continues to hold file after file deletion

I created a log file by running the iostat command to a text file, and ran the command in the background using nohup. #nohup iostat -xm 5 > /z/logfile.txt & Later on, I created a cronjob that runs every ten minutes doing the same as above, after I…
sawe
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Comparing floating-point numbers in bash

In my custom bash script for server monitoring , which actually made to force my CentOS server take some actions and alert me if resources are overloaded more time than expected, I get the following error line 17: [: 5.74: integer expression…
user5951362
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