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Something causing I/O Load

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linux-howto

http://serverfault.com – I have problem with I/O Load of my Server here is statistics : 18:15:14 up 14 days, 9:38, 1 user, load average: 21.98, 23.25, 24.71 674 processes: 670 sleeping, 1 running, 1 zombie, 2 stopped CPU0 states: 9.2% user 1.2% system 0.0% nice 22.3% iowait 66.0% idle CPU1 states: 4.3% user 0.5% system 0.0% nice 38.1% iowait 55.4% idle CPU2 states: 3.4% user 0.4% system 0.0% nice 49.0% iowait 46.0% idle CPU3 states: 9.2% user 1.4% system 0.0% nice 50.2% iowait 37.4% idle CPU4 states: 19.4% user 2.1% system 0.0% nice 65.3% iowait 11.4% idle CPU5 states: (HowTos)

taskli's picture
Submitted by taskli on 10/14/2012

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Munin won't draw iowait 1 year 1 week ago

Munin shows high iowait (see legend), but does not reflect it on graphs.

It has default config, except the graph_height (but the problem was from beginning, before the graph_height was chnaged).

What's wrong with it?

top - 08:43:16 up 96 days, 22:16, 1 user, load average: 4.03, 3.92, 3.98 Tasks: 199 total, 1 running, 198 sleeping, 0 stopped, 0 zombie Cpu0 : 0.0%us, 0.5%sy, 50.0%ni, 49.5%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Cpu1 : 0.0%us, 3.9%sy, 46.8%ni, 49.3%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Cpu2 : 0.0%us, 3.0%sy, 47.5%ni, 49.5%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Cpu3 : 0.0%us, 5

Here's the output I get when I run mpstat:

$mpstat Linux 3.2.0-30-generic (my-laptop-C650) 09/17/2012 _x86_64_ (2 CPU)

05:32:01 PM CPU %usr %nice %sys %iowait %irq %soft %steal %guest %idle 05:32:01 PM all 9.16 0.08 2.69 2.00 0.00 0.04 0.00 0.00 86.02

And here's what I get when I run it with a one-second interval:

$mpstat 1 05:31:51 PM CPU

avg-cpu: %user %nice %system %iowait %steal %idle 11.50 0.02 5.38 0.07 0.00 83.04

Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await svctm %util sdc 0.01 89.92 0.26 41.59 3.36 457.19 22.01 0.23 5.60 0.09 0.38 sdb 0.10 15.59 0.40 14.55 8.96 120.57 17.33

Hi All, using top command I have the below status

Code: load averages:  3.68,  3.20,  2.67;                    up 0+07:01:24                                                13:13:16 282 processes: 275 sleeping

I have db server with PostgreSQL 8.4 running on it.

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At one moment server becomes slow, load average was 20-40. So we bought new ssd disk 160GB and mounted it to /ssd.

If I run iostat I saw this:

avg-cpu: %user %nice %system %iowait %steal %idle 15.36 0.78 9.66 21.46 0.00 52.74 Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn sda 180.34 494.08 5741.44 28772164 334347968 sdc 0.01 0.08 0.00 4492 8 sdb 0.01 0.09 0.

root@host [/etc]# iostat -xk Linux 2.6.32-279.19.1.el6.x86_64 (host.superhostsite.com) 01/13/2013 _x86_64_ (24 CPU)

avg-cpu: %user %nice %system %iowait %steal %idle 12.53 0.19 3.72 0.18 0.00 83.38

Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await svctm %util sda 0.24 252.39 13.95 4.2

Hi, I want to calculate the total cpu usage from the sar report.