[hobbit] Question about using no-cache on rrd for xymon 4.3.0.0.beta-2

[Cleaver, Japheth]

I had the same problems as you with missing/gappy data, however –nocache seemed to work just fine. I haven’t had any issues since I started using it. Are you sure you’re calling it correctly?

 

CMD hobbitd_channel --channel=data --log=/dev/null hobbitd_rrd --no-cache --rrddir=/var/lib/xymon/rrd

CMD hobbitd_channel --channel=status --log=/dev/null hobbitd_rrd --no-cache --rrddir=/var/lib/xymon/rrd

 

… are what my rrddata and rrdstatus sections are using, respectively

 

 

Regards,

-jc

 

 

________________________________

From: Stewart, Tom L. [mailto:Tom.Stewart at landsend.com] 
Sent: Thursday, November 19, 2009 7:48 AM
To: hobbit at hswn.dk
Subject: RE: [hobbit] Question about using no-cache on rrd for xymon 4.3.0.0.beta-2

 

It has been almost a week and no-one has answered my question about turning off caching in the latest xymon code 

 

I checked the source code and my –no-cache flag seems to be correct, but the caching is continuing and is causing holes ( no update for a five minute period) in the rrd files. I also found where –no-cache is set within do_rrd.c and hobbitd_rrd.c, so I am assuming that there is a bug here that does not turn off caching using the –no-cache flag. 

 

So for a temporary fix, can I just set:

do_rrd.c:int use_rrd_cache = 1;   /* Use the cache by default */

to

do_rrd.c:int use_rrd_cache = 0;    /* Don’t use the cache by default */

 

recompile and move the binary over or would I be wasting my time as the caching would still continue?

 

Tom

 

 

________________________________

From: Stewart, Tom L. [mailto:Tom.Stewart at landsend.com] 
Sent: Friday, November 13, 2009 3:19 PM
To: hobbit at hswn.dk
Subject: [hobbit] Question about using no-cache on rrd for xymon 4.3.0.0.beta-2

 

We are having issues with rrd leaving 5-10 minute intervals of no data for items such as cpu load on various systems. Most of the time it happens three times in a row like at 2, 3 and 4 pm. I am not finding anything is the logs on either the client or server. Some googling indicated that the issue may go away by using the no-cache option for RRD. I have added it to the hobbitlaunch.cfg as such:

 

hobbitlaunch.cfg:       CMD hobbitd_channel --channel=status --log=$BBSERVERLOGS/rrd-status.log hobbitd_rrd --no-cache --extra-tests=cpucisco,ifaload,ifload,vload,wphlstat,wperrors --extra-script=/home/xymon/server/ext/extra-rrd.pl  --rrddir=$BBVAR/rrd

hobbitlaunch.cfg:       CMD hobbitd_channel --channel=data   --log=$BBSERVERLOGS/rrd-data.log hobbitd_rrd  --no-cache --extra-tests=mpstat,zonestat  --extra-script=/home/xymon/server/ext/rrd_data.pl --rrddir=$BBVAR/rrd

 

This is on a 32 bit red hat system and when I do a ps –ef | grep rrd I show the following:

 

xymon     7635  7599  0 14:26 ?        00:00:01 hobbitd_channel --channel=status --log=/home/xymon/logs/rrd-status.log hobbitd_rrd --no-cache --extra-tests=cpucisco,ifaload,ifload,vload,wphlstat,wperrors --extra-script=/home/xymon/server/ext/extra-rrd.pl --rrddir=/home/xymon/data/rrd

xymon     7636  7599  0 14:26 ?        00:00:00 hobbitd_channel --channel=data --log=/home/xymon/logs/rrd-data.log hobbitd_rrd --no-cache --extra-tests=mpstat,zonestat --extra-script=/home/xymon/server/ext/rrd_data.pl --rrddir=/home/xymon/data/rrd

xymon     7672  7635  0 14:26 ?        00:00:07 hobbitd_rrd --no-cache --extra-tests=cpucisco,ifaload,ifload,vload,wphlstat,wperrors --extra-script=/home/xymon/server/ext/extra-rrd.pl --rrddir=/home/xymon/data/rrd

xymon     7681  7636  0 14:26 ?        00:00:03 hobbitd_rrd --no-cache --extra-tests=mpstat,zonestat --extra-script=/home/xymon/server/ext/rrd_data.pl --rrddir=/home/xymon/data/rrd

 

So it looks like it is in effect, but looking at the tmp file I still see the following:

 

srw-rw-rw- 1 xymon xymon        0 Nov 13 14:26 rrdctl.7672

srw-rw-rw- 1 xymon xymon        0 Nov 13 14:26 rrdctl.7681

 

When I stop and restart xymon I still get messages such as:

 

rrd-status.log:2009-11-13 14:26:09 Cache flush completed

rrd-status.log:2009-11-13 14:26:18 Peer not up, flushing message queue

 

So my question is have I placed the –no-cache in the wrong sequence on the startup command or is that been taken out of beta-2?

 

Thank you,

Tom

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