Questions tagged [iostat]
92 questions
1
vote
1 answer
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 …
![](../../users/profiles/307758.webp)
Kramer Li
- 119
- 1
- 4
0
votes
1 answer
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 …
![](../../users/profiles/27813.webp)
rogerdpack
- 575
- 2
- 8
- 22
0
votes
3 answers
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…
![](../../users/profiles/451560.webp)
Heinz39
- 3
- 2
0
votes
2 answers
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) …
0
votes
1 answer
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…
![](../../users/profiles/195724.webp)
Mindaugas Bernatavičius
- 294
- 3
- 12
0
votes
3 answers
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…
![](../../users/profiles/307087.webp)
DivKis01
- 103
- 5
0
votes
0 answers
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
0
votes
1 answer
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
0
votes
0 answers
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…
![](../../users/profiles/260497.webp)
pdp
- 778
- 1
- 6
- 16
0
votes
1 answer
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 …
![](../../users/profiles/206001.webp)
Ashish Karpe
- 277
- 2
- 5
- 19
0
votes
1 answer
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…
![](../../users/profiles/213029.webp)
supmethods
- 275
- 3
- 14
0
votes
1 answer
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…
![](../../users/profiles/164872.webp)
Ken J
- 191
- 1
- 3
- 9
0
votes
1 answer
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…
![](../../users/profiles/166692.webp)
sz4kerto
- 201
- 1
- 3
- 5
0
votes
4 answers
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 …
![](../../users/profiles/147255.webp)
Niros
- 11
- 1
- 1
- 2
0
votes
1 answer
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…
![](../../users/profiles/122630.webp)
oshai
- 109
- 2