[Xymon] RRD change from 5 minutes to 1 minute
SebA
spah at syntec.co.uk
Thu Sep 24 13:21:14 CEST 2020
Thanks Scot! That's really good information! Very helpful for anyone
interested in doing what you've done.
Kind regards,
SebA
On Wed, 23 Sep 2020 at 22:06, Scot Kreienkamp <Scot.Kreienkamp at la-z-boy.com>
wrote:
> Hi SebA,
>
>
>
> Sure, I can detail it out a bit more. I installed from the Terabithia
> RPM’s so the path to the config files may be different, but on my system
> it’s /etc/xymon/rrddefinitions.cfg. Here’s what mine looks like now (minus
> commented lines at the top):
>
>
>
> [ifmib/60]
>
> RRA:AVERAGE:0.5:5:576
>
> RRA:AVERAGE:0.5:30:576
>
> RRA:AVERAGE:0.5:120:576
>
> RRA:AVERAGE:0.5:1440:576
>
>
>
> # This one is the default setup. You can change it, if you like.
>
> []
>
> -s60
>
> RRA:AVERAGE:0.5:1:3000
>
> # 576 datapoints w/ 5 minute interval = 48 hours @ 5 min avg.
>
> RRA:AVERAGE:0.5:5:576
>
> # 576 datapoints w/ 6*5 minute averaged = 12 days @ 30 min avg.
>
> RRA:AVERAGE:0.5:30:576
>
> # 576 datapoints w/ 24*5 minute averaged = 48 days @ 2 hour avg.
>
> RRA:AVERAGE:0.5:120:576
>
> # 576 datapoints w/ 288*5 minute averaged = 576 days @ 1 day avg.
>
> RRA:AVERAGE:0.5:1440:576
>
>
>
>
>
>
>
> I added the following 2 lines:
>
> -s60
>
> RRA:AVERAGE:0.5:1:3000
>
>
>
>
>
> The first is to change the step to 60 seconds, the second is to add
> another layer of data points. Since the step is now 60 seconds, the 1:3000
> at the end of the line means 1 data point per step, and 3000 data points in
> this data set. So it works out to 1 data point every minute for 3000
> minutes, or just over 2 days. After that the rest of the default RRA lines
> take over and roll up the data as they did before. The documentation for
> the step that I’ve seen shows the step with a space between like so: “-s
> 60”. That errors out on my system. It only works without the space, which
> has confounded me for years. I figured it out just by trying anything I
> could think of until I hit on removing the space.
>
>
>
> For the RRD file sizes, it doesn’t appear that they were affected at all.
> They were originally 43k and are still 43k. As I recall RRD files are a
> fixed size as of the original creation time, so to make this take effect I
> had to delete all my existing RRD files in /var/lib/xymon/rrd and let xymon
> create them again with the new settings. I tried to migrate them but I
> wound up with RRD files that only had 10 minutes of content in them so it
> wasn’t worth the effort of migrating them.
>
>
>
>
>
>
>
> *Scot Kreienkamp | Senior Systems Engineer | La-Z-Boy Corporate*
> One La-Z-Boy Drive | Monroe, Michigan 48162 | ( 734-384-6403 | | )
> 1-734-915-1444 | * Scot.Kreienkamp at la-z-boy.com
>
>
>
> *From:* SebA <spah at syntec.co.uk>
> *Sent:* Wednesday, September 23, 2020 1:57 PM
> *To:* Scot Kreienkamp <Scot.Kreienkamp at la-z-boy.com>
> *Cc:* xymon at xymon.com
> *Subject:* Re: [Xymon] RRD change from 5 minutes to 1 minute
>
>
>
> *ATTENTION: This email was sent to La-Z-Boy from an external source.
> Be vigilant when opening attachments or clicking links.*
>
> Hi Scot,
>
>
>
> Thanks for sharing, but I didn't follow exactly what you needed to change
> and where - maybe I could find out by digging a little, but I'm sure you
> could tell me faster!
>
>
>
> Also, are you able to see how much larger the rrd files are, after your
> change? Or maybe you'd need to wait longer to see.
>
>
>
> Kind regards,
>
> SebA
>
>
>
>
>
> On Wed, 23 Sep 2020 at 04:25, Scot Kreienkamp <
> Scot.Kreienkamp at la-z-boy.com> wrote:
>
> Hi Ralph,
>
>
>
> The documentation is wrong. I ended up figuring it out after several
> hours of trial and error. It shows -s 60 should work but the code doesn’t
> account for the space. It MUST be -s60 (without the space) or it will
> error out every time. I ended up adding RRA:AVERAGE:0.5:1:3000 to the
> existing default config which should cover slightly more than two days
> worth of 1 minute datapoints. That will give the 2 day graphs the detailed
> resolution I want to see, beyond 2 days the existing config is ok. And
> yes, you’re right about the existing data. I had to delete all my RRD’s
> and let xymon create them again and start populating them from scratch. I
> tried to do the RRD export and import but the changes resulted in an RRD
> that had no data anyway, so I just went the delete them all route. So far
> I have 24 hours of data. When I get past 48 hours I should know if there
> are any repercussions, but since I haven’t modified the existing RRA’s I
> don’t expect any.
>
>
>
> Hopefully this will help someone else.
>
>
>
> *Scot Kreienkamp | Senior Systems Engineer | La-Z-Boy Corporate*
> One La-Z-Boy Drive | Monroe, Michigan 48162 | ( 734-384-6403 | | )
> 1-734-915-1444 | * Scot.Kreienkamp at la-z-boy.com
>
>
>
> *From:* Ralph M <ralphmitchell at gmail.com>
> *Sent:* Tuesday, September 22, 2020 11:10 PM
> *To:* Scot Kreienkamp <Scot.Kreienkamp at la-z-boy.com>
> *Cc:* xymon at xymon.com
> *Subject:* Re: [Xymon] RRD change from 5 minutes to 1 minute
>
>
>
> *ATTENTION: This email was sent to La-Z-Boy from an external source.
> Be vigilant when opening attachments or clicking links.*
>
> You might be able to use rrdtune to alter the step value, but that may be
> just the tip of the iceberg. For example, what happens to existing data in
> the RRD? What about new RRDs created by Xymon? Do the graph definitions
> need to change for display? &c
>
>
>
> Ralph Mitchell
>
>
>
>
>
> On Mon, Sep 21, 2020 at 3:34 PM Scot Kreienkamp <
> Scot.Kreienkamp at la-z-boy.com> wrote:
>
> I run most of my tests every 60 seconds. Does anyone know how to change
> the RRD graph default to accept data every 1 minute instead of every 5
> minutes?
>
> *Scot Kreienkamp | Senior Systems Engineer | La-Z-Boy Corporate*
> One La-Z-Boy Drive | Monroe, Michigan 48162 | ( 734-384-6403 | | )
> 1-734-915-1444 | * Scot.Kreienkamp at la-z-boy.com
> www.la-z-boy.com | facebook.com/lazboy | twitter.com/lazboy |
> youtube.com/lazboy
>
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