IPA high disk writes

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mhaluska
Posts: 2
Joined: 2020/01/08 20:33:09

IPA high disk writes

Post by mhaluska » 2020/01/12 11:03:01

Some idea why there is so high write load? Now it's 120GB written on VM serving only IPA server in 22 days.
There is almost no activity, 5 users registered, 1-2 active now.
Using iotop I found it's possible ns-slapd causing most of writes. Some idea how to decrease this?

Code: Select all

ipa-client-4.7.1-11.module_el8.0.0+79+bbd20d7b.x86_64
ipa-client-common-4.7.1-11.module_el8.0.0+79+bbd20d7b.noarch
ipa-common-4.7.1-11.module_el8.0.0+79+bbd20d7b.noarch
ipa-python-compat-4.7.1-11.module_el8.0.0+79+bbd20d7b.noarch
ipa-server-4.7.1-11.module_el8.0.0+79+bbd20d7b.x86_64
ipa-server-common-4.7.1-11.module_el8.0.0+79+bbd20d7b.noarch
ipa-server-dns-4.7.1-11.module_el8.0.0+79+bbd20d7b.noarch
I attached output from iotop -o -b -d 30

hunter86_bg
Posts: 2016
Joined: 2015/02/17 15:14:33
Location: Bulgaria
Contact:

Re: IPA high disk writes

Post by hunter86_bg » 2020/01/12 17:15:00

I can only recommend you to attach strace to your running process and check what it is writing to.

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strace -fvttTyyx -s 4096 -o /tmp/strace.txt -p <PID of process> 
Keep in mind that strace can slow things down , so you can't keep it running for ever.
If you want , you can try to filter only writes like this :

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strace -fvttTyyx -e trace=write -s 4096 -o /tmp/strace.txt -p <PID of process> 

mhaluska
Posts: 2
Joined: 2020/01/08 20:33:09

Re: IPA high disk writes

Post by mhaluska » 2020/03/02 20:34:44

Sorry for late response, I didn't get notification and then I totally forgot I created this post.
Output from iotop and strace are in attachments.
iotop.log.gz
(5.27 KiB) Downloaded 2 times
strace.txt.gz
(23.95 KiB) Downloaded 1 time

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