Default Graph SIze 🔗 link

On 22-12-2011 22:56, James Wade wrote:

I'm doing a new installation of xymon. Everything is working great, but
I'm in the process of configuring and could use some assistance, so you
might see a few more posts from me.

Is there a way to have the graphs on each default to a different
setting? As an example, when looking at cpu, instead of a two day graph
have a one hour graph. Is there a global setting?

On Thu, Dec 22, 2011 at 5:02 PM, Henrik Størner <user-ce4a2c883f75@xymon.invalid> wrote:

On 22-12-2011 22:56, James Wade wrote:

I'm doing a new installation of xymon. Everything is working great, but
I'm in the process of configuring and could use some assistance, so you
might see a few more posts from me.

Is there a way to have the graphs on each default to a different
setting? As an example, when looking at cpu, instead of a two day graph
have a one hour graph. Is there a global setting?

TRENDSECONDS in xymonserver.cfg. If you change this, then you'll probably
also want to change the RRDWIDTH setting, which defines the size of the
graph image.

On www.xymon.com, TRENDSECONDS is set to 259200 = 3 days, and RRDWIDTH is
set to 864; the reasoning being that with measurements every 5 minutes
there are 288 measurements per day, so 3 days = 864 measurements. Matching
the RRDWIDTH setting with this means that each measurement gets 1 pixel.

On Fri, Dec 23, 2011 at 9:38 AM, Ralph Mitchell <user-00a5e44c48c0@xymon.invalid>wrote:

On Thu, Dec 22, 2011 at 5:02 PM, Henrik Størner <user-ce4a2c883f75@xymon.invalid> wrote:

On 22-12-2011 22:56, James Wade wrote:

I'm doing a new installation of xymon. Everything is working great, but
I'm in the process of configuring and could use some assistance, so you
might see a few more posts from me.

Is there a way to have the graphs on each default to a different
setting? As an example, when looking at cpu, instead of a two day graph
have a one hour graph. Is there a global setting?

TRENDSECONDS in xymonserver.cfg. If you change this, then you'll probably
also want to change the RRDWIDTH setting, which defines the size of the
graph image.

On www.xymon.com, TRENDSECONDS is set to 259200 = 3 days, and RRDWIDTH
is set to 864; the reasoning being that with measurements every 5 minutes
there are 288 measurements per day, so 3 days = 864 measurements. Matching
the RRDWIDTH setting with this means that each measurement gets 1 pixel.

If I set  TRENDSECONDS & RRDWIDTH, I get blocky graphs, presumably due to
there not being sufficient data at the normal resolution.  To fix that, I
*think* I need to:

1) resize all the the rrd files with 'rrdtool resize' - wrote a script for
that
2) alter server/etc/rrddefinitions.cfg to set the defaults for new rrd -
done that

Did I miss anything?

Thanks,

Ralph Mitchell

Ralph,

I just changed TrendSeconds to 8640 (1 day)  and left the RRDWIDTH the
same. I get a one day graph which looks fine.

James

On Fri, Dec 23, 2011 at 9:38 AM, Ralph Mitchell <user-00a5e44c48c0@xymon.invalid>wrote:

On Thu, Dec 22, 2011 at 5:02 PM, Henrik Størner <user-ce4a2c883f75@xymon.invalid> wrote:

On 22-12-2011 22:56, James Wade wrote:

I'm doing a new installation of xymon. Everything is working great, but
I'm in the process of configuring and could use some assistance, so you
might see a few more posts from me.

Is there a way to have the graphs on each default to a different
setting? As an example, when looking at cpu, instead of a two day graph
have a one hour graph. Is there a global setting?

TRENDSECONDS in xymonserver.cfg. If you change this, then you'll
probably also want to change the RRDWIDTH setting, which defines the size
of the graph image.

On www.xymon.com, TRENDSECONDS is set to 259200 = 3 days, and RRDWIDTH
is set to 864; the reasoning being that with measurements every 5 minutes
there are 288 measurements per day, so 3 days = 864 measurements. Matching
the RRDWIDTH setting with this means that each measurement gets 1 pixel.

If I set  TRENDSECONDS & RRDWIDTH, I get blocky graphs, presumably due to
there not being sufficient data at the normal resolution.  To fix that, I
*think* I need to:

1) resize all the the rrd files with 'rrdtool resize' - wrote a script
for that
2) alter server/etc/rrddefinitions.cfg to set the defaults for new rrd -
done that

Did I miss anything?

Thanks,

Ralph Mitchell

On 23-12-2011 23:59, Ralph Mitchell wrote:

The one day graph *would* look fine, but I kinda like the 3-day.

The "blocky" look I'm seeing comes from RRD generating the graph using
the best datasource to fit the size you're asking for.  By default, the
first data store contains 576 points at 5 minute intervals, which covers
2 days.  The second data store contains 576 point at 30 minute
intervals, which is 12 days.  Each of the 30-minute data points is
generated by averaging together 6 of the 5-minute data points.  If you
ask rrd to generate a 3 day graph, there are not enough points in the
first data store, so it uses the second store and each point on the
graph then covers more pixels.

It's the same effect as zooming in on a graph.  To fix it, I've resized
the existing RRDs to hold 864 data points, so there will be enough
fine-grain data to get a decent 3-day graph.

On Fri, Dec 23, 2011 at 6:02 PM, Henrik Størner <user-ce4a2c883f75@xymon.invalid> wrote:

On 23-12-2011 23:59, Ralph Mitchell wrote:

The one day graph *would* look fine, but I kinda like the 3-day.

The "blocky" look I'm seeing comes from RRD generating the graph using
the best datasource to fit the size you're asking for.  By default, the
first data store contains 576 points at 5 minute intervals, which covers
2 days.  The second data store contains 576 point at 30 minute
intervals, which is 12 days.  Each of the 30-minute data points is
generated by averaging together 6 of the 5-minute data points.  If you
ask rrd to generate a 3 day graph, there are not enough points in the
first data store, so it uses the second store and each point on the
graph then covers more pixels.

It's the same effect as zooming in on a graph.  To fix it, I've resized
the existing RRDs to hold 864 data points, so there will be enough
fine-grain data to get a decent 3-day graph.

Right, forgot to mention that I've done something similar on the
www.xymon.com site.

You can change it in "rrddefinitions.cfg", but it will not change any
existing files - only newly created ones.

On 24-12-2011 00:11, Ralph Mitchell wrote:

On Fri, Dec 23, 2011 at 6:02 PM, Henrik Størner <user-ce4a2c883f75@xymon.invalid
<mailto:user-ce4a2c883f75@xymon.invalid>> wrote:

    You can change it in "rrddefinitions.cfg", but it will not change
    any existing files - only newly created ones.


OK, thanks.  That's what I was wondering - is there anything still
compiled in?  I guess that's a "not any more".

I've thrown together a script to resize the existing RRD files, seems to
work OK.  It just gets the RRA list from "rrdtool info", then loops
through resizing one at a time.  I'd post the script, but it's at work
and I'm not...  :-)   If anyone is interested, it shouldn't take too
long to re-invent.