Hi,
thanks for your very helpful answer.
It took me a few days to get back to that issue, so sorry for that late responose.
I've added additional lines for outgoing, and it works as expected.
I'm absolutely fine with hardcoed interfaces, cause I need the aggregated view of
particular interfaces.
Thanks again,
Stephan
Am Donnerstag, den 13.10.2011, 19:42 +0200 schrieb Henrik Størner:
On 13-10-2011 16:44, netz-haut - stephan seitz wrote:
is there any "usual" way, to monitor and graph the traffic of a bulk
of network interfaces? The reason is, some of our hosts are connected
to iSCSI storages via multipath over two or four independent
interfaces. Since the traffic is balanced equally, every interface
shows (more or less) the same amount of traffic. This leads to very
useless rrdtool graphics as there is only one multicolored thick line
visible. It would be really helpful to see a graph which shows the
SUM of the particular interfaces.
This can be done by creating an RRD graph definition to do the summation
for you.
In RRDtool, you first use one or more "DEF" lines to grab specific data
items from one or more RRD files, and put them into some "variables".
You can then either use these variables directly to make a line on the
graph, or you can use them for calculating other variables via a "CDEF"
line.
The default ifstat graph has these lines:
DEF:inbytes at RRDIDX@=@RRDFN@:bytesReceived:AVERAGE
CDEF:in at RRDIDX@=inbytes at RRDIDX@,8,*
(The @RRDIDX@ and @RRDFN@ are because this graph repeats over all the
interfaces - Xymon replaces these with a number and the RRD filename).
What this does is to first define a variable "inbytes at RRDIDX@" which has
the "bytesReceived" value from the RRD. The it computes another
variable, "in at RRDIDX@" as 8*inbytes - to convert from bytes to bits.
The notation here is Reverse Polish (RPN).
So if you have 4 RRD files, one for each interface, you can have RRDtool
do the math for you like this:
[ifsum]
TITLE Network Traffic
YAXIS Bits/second
DEF:inbytes0=ifstat.eth0.rrd:bytesReceived:AVERAGE
DEF:inbytes1=ifstat.eth1.rrd:bytesReceived:AVERAGE
DEF:inbytes2=ifstat.eth2.rrd:bytesReceived:AVERAGE
DEF:inbytes3=ifstat.eth3.rrd:bytesReceived:AVERAGE
CDEF:intotal=inbytes0,inbytes1,inbytes2,inbytes3,+,+,+
CDEF:inbits=intotal,8,*
LINE:inbits#FF0000:Aggregate inbound
The "LINE" definition then uses the "inbits" value to draw a (red) line
with this data.
Have a look at graphs.cfg, and I'm sure you can figure out to add a line
for the outgoing data also.
Add "ifsum" to the GRAPHS setting in xymonserver.cfg, and the graph
should show up on the "trends" page.
Regards,
Henrik
PS: I haven't actually tested any of this, so feel free to provide
corrections :-)