"Communication failure" allert in web-panel

Hello.

I've installed OMV 3 on my D-Link DNS-325 - https://habrahabr.ru/post/329596/ (rus)

But now I have trouble with web-panel. I think it occurs because of CPU overloading, but I don't sure. Sometimes web-panel pulls "communication failure" alerts.

Simple way to reproduce is open 2 or 3 web-panel tabs simultaneously:

Or run rsync and try to open HDD tab:

Any ideas?

sorry, wrong link - https://habrahabr.ru/post/327076/

ping!

Quote from The Master

Hi

"I think it occurs because of CPU overloading, but I don't sure."

Ahm ... yes .. i´m Shure

Why you need 5 Tabs in the Browser with the same IP (in this case Openmediavault Web )

and (just a suggestion ) try it with Kernel 4.9

Display More

I opened it just to show simple steps to reproduce. It also occurs with one tab and one service task, for example rsync (second video in 1 post).

Ok, I'll try 4.9. Why do you recommend it instead of 4.10?

Quote from Wolf2000

The CPU is not the problem but 256 MB RAM is too little.

Ok, I'll create swap file or swap partition on HDD.

UPD: I think it's not a reason.

Quote from The Master

and (just a suggestion ) try it with Kernel 4.9

There is no difference in behavior between 4.9 and 4.10.

Quote from The Master

And now? Works Better with the Swap partition ?

No, it doesn't work better. See picture in post #7, processes and system together share less than 245 MB available RAM.

Is there a way to check the condition that is not satisfied and results in the "communication failure" exception?

Quote from votdev

How much cores does the CPU have? The load is very high, so i think this is the reason.

Yes, the CPU have 1 core. But why is it a problem? Which component requires rapidly performing and can't wait?

Can I detect the problem without guessing? Something pushes JS exception, I guess. What is it?

Quote from votdev

We need to know which plugin you have installed. In general every component does not need huge resources. The WebUI has absolute nothing to do with this. The problem is something with nginx or php-fpm. Please have a look into the syslog and look for OOP's or other anomalies.

There are no plugins installed.

Lines in /var/log/syslog when problem is happening:

Jun  7 16:20:49 dns325 monit[1943]: 'dns325' loadavg(1min) of 4.3 matches resource limit [loadavg(1min)>2.0]
Jun  7 16:21:23 dns325 monit[1943]: 'dns325' loadavg(5min) of 3.8 matches resource limit [loadavg(5min)>1.0]
Jun  7 16:21:23 dns325 monit[1943]: 'dns325' loadavg(1min) of 3.9 matches resource limit [loadavg(1min)>2.0]
Jun  7 16:21:59 dns325 monit[1943]: 'dns325' loadavg(5min) of 3.8 matches resource limit [loadavg(5min)>1.0]
Jun  7 16:21:59 dns325 rsyslogd-2007: action 'action 20' suspended, next retry is Wed Jun  7 16:23:29 2017 [try http://www.rsyslog.com/e/20
07 ]
Jun  7 16:21:59 dns325 monit[1943]: 'dns325' loadavg(1min) of 4.2 matches resource limit [loadavg(1min)>2.0]
Jun  7 16:22:36 dns325 monit[1943]: 'dns325' loadavg(5min) of 4.3 matches resource limit [loadavg(5min)>1.0]
Jun  7 16:22:36 dns325 monit[1943]: 'dns325' loadavg(1min) of 6.0 matches resource limit [loadavg(1min)>2.0]
Jun  7 16:23:15 dns325 monit[1943]: 'dns325' loadavg(5min) of 4.9 matches resource limit [loadavg(5min)>1.0]
Jun  7 16:23:15 dns325 monit[1943]: 'dns325' loadavg(1min) of 7.6 matches resource limit [loadavg(1min)>2.0]

Quote from The Master

Give Us the output of

dpkg -l | grep openm

root@dns325:~# dpkg -l | grep openm
ii  openmediavault                 3.0.78                     all          Open network attached storage solution
ii  openmediavault-keyring         1.0                        all          GnuPG archive keys of the OpenMediaVault archive

Quote from Wolf2000

Hi RomaNNN
Your machine is too weak

It's not a reason. I want to understand which component is doing something wrong and what can I configure to solve the issue.