I’ve got it disabled at the moment and so far our storage guy hasn’t screamed at me.  We started using it some time ago before we upgraded our NAS boxes because our old ones were in fact write I/O starved badly, with the newer units it might not be so bad but…  why did it suddenly stop working, and why did it spawn enough processes off to totally kill I/O access to our four month old TrueNAS boxes taking our SOC monitoring platform (Running on the same SSD volume), and a couple of other servers out.  Customers don’t like it much when you lose monitoring of their systems and the networks to get to them.

 

 

 

From: observium <observium-bounces@observium.org> On Behalf Of Adam Armstrong via observium
Sent: Monday, May 6, 2019 10:46 AM
To: Hamilton, Kent via observium <observium@observium.org>
Cc: Adam Armstrong <adama@memetic.org>
Subject: Re: [Observium] RRDCached issue - HELP!

 

Do you actually need rrdcached?

 

It slows down graph creation, and is really only useful on single systems if you are I/O write starved.

 

adam.

On 2019-05-06 16:43:28, Hamilton, Kent via observium <observium@observium.org> wrote:

Starting this weekend rrdcached appears to have stopped working correctly.  Has anyone seen an issue with this?

We’ve been using it for a long time and it seems to have broken totally early Sat morning (somewhere around 1 to 2 AM)

 

Running the poller with debug doesn’t give me a status any more, and I have hundreds of rrdtool processes being spawned to the point it actually took over most of the disk IO on our NAS on Saturday.

 

/opt/observium# poller.php -h localhost -m system -dd  | grep RRD

RRDtool 1.7.0  Copyright by Tobias Oetiker <tobi@oetiker.ch>

RRDCacheD 1.7.0

o RRDtool              1.7.0 (rrdcached 1.7.0: unix:/var/run/rrdcached.sock)

RRD PIPE OPEN[TRUE]

o RRDTool Usage         (0s 0%)

RRD PIPE CLOSE[TRUE]

 

The host setup is:

Ubuntu 18.04

Observium Professional 19.5.9870

PHP Weathermap 0.97b

rrdcached 1.7.0-1build1

rrdtool-1.7.0-1build1

PHP 7.2

 

The rrdcached command line is

/usr/bin/rrdcached -B -R -F -L -w 1800 -z 1800 -f 3600 -t 10 -b /opt/observium/rrd -j /var/lib/rrdcached/journal/ -G www-data -U www-data -p /var/run/rrdcached.pid -s www-data -m 0660 -l unix:/var/run/rrdcached.sock

 

Really need to get this one solved if anyone can offer help.

 

 



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