The iostat command is used for monitoring the CPU utilization and input/output load of devices attached to a system by observing the time the devices are active in relation to their average transfer rates.

learn more… | top users | synonyms

0
votes
0answers
19 views

Install IOTOP/IOSTAT via ZYPPER (or anything else) on a SUSE (SLES) 12 Virual Machine (HyperV)

I have a virtual machine hosted on HyperV. It is a SUSE Enterprise 12 OS residing in a rack somewhere in the dark side of our office. This machine is under-performing during a certain load that takes ...
1
vote
1answer
41 views

Is there a way to monitor disk i/o patterns? (i.e. random or sequential i/o?)

While an application is running, I can monitor disk bandwidth usage using linux tools including dstat. Now I'd like to know how many sequential or random disk I/Os are occurring in the system. Does ...
1
vote
1answer
30 views

Execute command inside guest vm Libvirt

Is it possible to execute a command for eg:iostat inside a guest VM using libvirt or virsh .I want to find out IOPS for a guest vm but with libvirt java api I am not able to get the IOPS of a vm ...
0
votes
0answers
37 views

Random write on DISK benchmark shows high read rate on iostat

I am running a random write benchmark directly on some disks (HDD & SDD) and I am getting some weird output data on the iostat monitor. Besides the usual write rate, there is a read rate that I ...
0
votes
1answer
34 views

Getting averageReadTime and averageWriteTime in solaris(disk I/O)

I am working on getting 'Average read time (ms)' and 'Average write time(ms)' from "iostat -xnp" command. In linux there is a '/proc/diskstats" command, which gives me 'Time spent in reading millis' ...
1
vote
1answer
151 views

iostat - What does the 'steal' field mean?

In output of iostat there is a steal field, according to man page the field is used to: Show the percentage of time spent in involuntary wait by the virtual CPU or CPUs while the hypervisor was ...
1
vote
0answers
39 views

IOSTAT report doesn't match with DD benchmark

I am running a DD benchmark but the obtained results are not matching with the IOSTAT values. This is the DD sample: $ sudo dd bs=4096 count=690 if=/dev/zero of=/mnt/tmp/test oflag=dsync 690+0 ...
2
votes
1answer
89 views

where can I find the disk latency using iostat ( await, svctm, %util )?

I'm using Redhat Linux 6.5 and would like to see the disk latencies for the used disks. Using iostat I get the columns await and svctm ( including %util ). But according to the man page of iostat ...
1
vote
0answers
28 views

iostat ( column svctm is not trusted any more ) what to use instead?

I'm running a Linux Server with "Oracle Linux Server release 6.5" which is pretty much the same as RedHat Version. I need to determine the latency on my disk devices. The man page of the iostat ...
2
votes
0answers
36 views

Trying to understand iostat for simple sequential read case

I'm looking at the disk I/O performance of a web hosting VPS (virtual server) and I'd like help in understanding the figures that 'iostat' is giving me. This is my very simple sequential read of the ...
1
vote
0answers
185 views

How can I get read/write instant speed of a Hard Drive using /proc/diskstats data?

I know that the proc/diskstats file presents these data columns: 1 - major number 2 - minor mumber 3 - device name 4 - reads completed successfully 5 - reads merged 6 - sectors read 7 - time spent ...
0
votes
0answers
60 views

Software raid problem

We have a software raid on our server and we have a problem with disk performances. From time to time disk i/o freezes. During those periods iostat shows that one disk is faster than another. Both ...
0
votes
1answer
124 views

Why doesn't my IOstat change its output at all?

My IOstat doesn't change...at all. It'll show a change in blocks being read and written, but it doesn't change at all when it comes to blocks/kB/MB read and written. When the server sits idle...it ...
2
votes
1answer
336 views

How can I find the CPU resource utilization of a process and all its children [duplicate]

If I have a process that spawns child processes, is there a good way to get a single number representing the combined CPU use of that process and its children? i.e is there a simple shell command ...
2
votes
2answers
75 views

Current disk load

I'm using iostat to get the current disk load each second with iostat -dx 1 (specially, %util column). However, I'd like to put this in a bash script and control the interval with the watch command ...
1
vote
1answer
288 views

iostat error counters on Solaris

In a Solaris system i use iostat -E and kstat to identify faulted disks. My problem is that I don't know if the problem is on disk, on controller, on bus or on the filesystem layer (ZFS). The key is ...
3
votes
0answers
1k views

Difference between 'sar' and 'iostat' commands

With sar and iowait, we can get CPU time utilization. But, when I executed both commands, I could see significant differences in their outputs. > iostat && sar 1 1 Linux ...
0
votes
0answers
766 views

Understanding iostat with Linux software RAID

I'm trying to understand what I see in iostat, specifically the differences between the output for md and sd devices. I have a couple of quite large Centos Linux servers, each with E3-1230 CPU, 16 GB ...
2
votes
1answer
58 views

iostat am I okay?

This is the result of iostat avg-cpu: %user %nice %system %iowait %steal %idle 13.65 0.00 9.98 3.86 2.22 70.29 Device: rrqm/s wrqm/s r/s w/s rkB/s ...