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Questions tagged [iostat]

90 questions
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why iostat not showing one of my disk?

Please check the picture below. The df shows /dev/xsda mounted But iostat not showing the device. Why? [admin] /dev]$df -h | grep '/dev' tmpfs 64M 0 64M 0% /dev /dev/nvme1n1 7.0T 50G 6.6T 1% /etc/hosts shm 2.0G …
Kramer Li
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How does avgqu-sz size in iostat output relate to r_await and w_await?

Can someone explain what does avgqu-sz mean in the output of iostat? The manual page states like this. avgqu-sz: The average queue length of the requests that were issued to the device. Can someone help me understand this a little more? In one…
tuk
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iostat %util for NFS mounted shares available?

Is there a way to calculate, from the client, the "% util" of NFS mounted disks? I know with iostat, with locally mounted disks you can see %util Device: rrqm/s wrqm/s r/s ... svctm %util sda 0.00 0.00 0.00 …
rogerdpack
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modify iostat -t time output format

I was trying to plot the results of various iostat results. For that I want to use https://clusterbuffer.wordpress.com/file-system-tools/iostat_plot/iostat-plotter-v3/. Anyhow - for some inexplicable reason, that script has the time format it…
Heinz39
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How to determine if I/O is slow for server

I have used I/O stat to check whether my server's I/O is slow or not. The % util is high but so is the read/sec - write/sec. Can anyone help ? Following is the output of iostat -mx command Linux 2.6.32-573.12.1.el6.x86_64 (bristol.zcubator.net) …
badass_programmer
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How to get gcc installed on CoreOS hostmachine rather than the containers running inside it

I have an external monitoring tool that connects over ssh periodically and checks the various system params of a linux box (cpu, mem, etc.). However this approach does not work with CoreOS since it has alost nothing on it (sysstat, tcpdump and so…
Mindaugas Bernatavičius
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e2fsck takes lot of time to run

I am running e2fsck on one of my disk partitions (ext4) but it seems to take eternity. It is already running now for almost 10 hours or so and it is still at 42%. The size of the partition is around 800Gigs and overall disk size(on which the…
DivKis01
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Nagios php script to read iostat values

I'm working on a php script(nagios plugin) to read r/s,w/s,rMB/s,wMB/s,%util from the iostat command, e.g. #iostat -xm sda avg-cpu: %user %nice %system %iowait %steal %idle 1.05 0.08 1.16 6.24 0.00 91.47 Device: …
user387821
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Bytes read / written SNMP value differs from iostat

I am trying to monitor my server over SNMP and UCD-DISKIO-MIB::diskIONRead.1 gives me 1344574464 while iostat reports 9701669 kB_read. Why the discrepancy? I don't have to mention that I am monitoring the correct disk, so that's not the cause.
user178826
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No w/s in iostat output even though wMB/s is high

I am trying to format a 2 TB SAN based block device (/dev/mapper/mpathb). Even though, mke2fs has been running since over one hour without completing, iostat -z -x -m 10 output in a separate terminal shows a surprising thing: There are no completed…
pdp
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Not getting Proper output for check_iostat for nrpe plugins

My iostat is giving following output $ iostat Linux 3.13.0-29-generic (Inksedge) 08/13/2015 _x86_64_ (4 CPU) Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn xvdap1 0.62 0.13 9.01 3282841 …
Ashish Karpe
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Interpreting the IOstat result

Below are the results for iostats: Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn sda 120.94 10201.14 4354.87 64513033284 27540653120 sdb 63.65 3968.03 4354.86 25094207680…
supmethods
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Get I/O TPS for NFS on Solaris machines

I'm attempting to get IOPS for my Solaris servers. Typically I use tps for this calculation, however: iostat gives TPS but only for local disks. iostat -x gives everything but TPS for ALL disks. sar -d gives a lof...(but no TPS) for ALL disks. Is…
Ken J
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High cancelled_write_bytes, high IO load, concurrent memory-mapping

I have a software for persisting/retrieving data from files (a bit like database, but it's not exactly a database engine). It's not open source and the documentation is sparse, therefore I don't have exact information about it's inner workings. It…
sz4kerto
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iostat shows 100% utilization - what can be done to improve performance?

I have dedicated web server with CentOS. Recently, I get very high server load, probably caused due to IO bottleneck. iostat -mx 3 shows: avg-cpu: %user %nice %system %iowait %steal %idle 12.15 0.00 19.97 67.89 0.00 …
Niros
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