Questions tagged [iostat]
90 questions
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how can I tell if there is a cpu trashing on my linux machine
I want to write a script that will kill my processes when my machine is doing "too much" swapping of process memory from disk to memory.
What is the best way to determine that? I saw top has %wa and iostat has iowait data. vmstat has swap in and…
oshai
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MySQL insert cause high disk i/o wait?
Im getting what appears a lot of wait time when performing large inserts in Mysql. Am I correct in assuming I have a disk I/O problem? Yes I am running Mysql on a VM.
Innodb_buffer_pool hit rate is %100
innodb_flush_method = ''
innodb_log_file_size…
Matt
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IO utilization percent of 4920.45% - iostat -x , What's wrong?
I have seen wrong percent use of a disk IO some times on servers that have been a long time without reboot.
By any means this server has significant IO. Tonight it'll be rebooted and I'm sure tomorow we will have nice %use.
Uptime is 497…
user45949
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iostat -En output formatting
I have a problem extracting the device names on Solaris 8 SPARC when using 'iostat -En' command since the device names are too long.
For example :
iostat -en output
---- errors ---
s/w h/w trn tot
0 1 0 1 c6t50060E8005BDEC37d124
iostat –En…
user834895
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Raid array overloaded with no apparent reason, iostat output not making much sense?
I am looking to an iscsi installation comprised of the raid arrays managed by an HP P400 controller.
2 pairs of drives each mirrored plus 4 drives in a raid 10 configuration, all 7200rpm sas drives.
The drives hold vmfs3 volumes exported through…
Fulvio Scapin
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Nginx causing high load with not many active connections
I have a linux machine 64bit (centos5.5), 2.83GHz Q9550, 6gb ram and a single SATA 500gb drive.
From this machine I only serve thumbnails, most around 10kb in size and at this point there are about 7 million thumbnails on the server. I have them…
Mr.Boon
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SNMP monitoring of iostat on a Solaris 10 server?
I'm looking at the System Management Agent resources which gives guidance to the Solaris SNMP tools however after extensive googling I can't find any OID reference list or details on what can be monitored; I'm looking for iostat in particular.
Can…
dwightgunning
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Counting And Summing Disk IOs in Windows
Among other (see a post of mine) I am trying to count and add the number of bytes read/written to a disk
during a minute/hour/day/... on windows. According to the Physical Disk Object
documentation from microsoft…
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Windows: record I/O stats (eqivalent to iostat)
Are there any tools on Windows that allow performance statistics to be recorded? Something similar to iostat 10 > iostat.log on Unix?
I have 10 Windows VMs that run a whole lot of regression scripts overnight. Sometimes we see failures that we…
user56422
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rhel + disk util is very high , what is the impact for long term
we have backup server with rhel version 7.2
server is VM machine , and OS disk is VMDK disk
disk used space is around - 50% , and from smartctl we not see problem
as we can see from follwing details
the disk util is very high sometimes even reached…
King David
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Needs to identify cause of high load average
I see high kB_read in iostat output. right now, load average of the system is very high. Is it io bound high load?
GBD
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System performance of Rasperry Pi (running k8s) is very poor - how to debug?
Summary
I'm running a slim homelab (Kubernetes cluster with few pods, Gitea, Drone, Docker Registry, and NFS share) on a 2-Pi4 cluster, and the system performance is poor. I've noted that the controller node's filesystem looks pretty slow - I'm not…
scubbo
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High util iostat
I have server with oracle db. It works on Dell Unity storage.
The server has very slow disk IO.
How can I fix it?
Here are some details of my server:
OS - OL8
Kernel - 5.4.17 uek
Storage - Dell Unity XT 880F (32 * SSD disk 1,92TB)
DB -…
j.stalin
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High I/O wait in apache tomcat server
Facing high I/O wait in apache tomcat server when the load increases.
Suspecting disk I/O is less when tomcat is running however. disk IO seems drops drastically when tomcat is running along with the load.
Other resources(CPU,RAM) are under…
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iostat reporting low r/s on first line for specific disk, expected r/s on all following lines for that same disk
When copying data from hard disk sdc to sda, I notice that the number of read requests completed per second was unusually low:
$ iostat -x 1 1
Linux 3.13.0-32-generic (melancholy) 2014-08-15 _x86_64_ (4 CPU)
avg-cpu: %user %nice…
dotancohen
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