[rrd-users] Re: gigabit interfaces

[Gellatly, Laurie]

That sounds correct to me. Unless you can retrieve ifHCInOctets etc (which
are
64bit counters) then your only real choice is to decrease your sampling time
to < 34 seconds to be sure your counters won't wrap.

You don't need to keep 10* the number of samples IF you are happy to let
RRDTool
do the consolidation for you. i.e. if you originally had an RRA that kept 30
hours 
of 300 second samples (as the primary RRA) then you could now, for instance,

have a different primary RRA that kept say 3 hours on a 30 second sample and

have that consolidate into the next RRA (the original 30 hours of 300
second) 
by averaging the data. The graphs that you are producing now would still
have
an RRA to work directly from and, IMHO you would achieve what you are
looking for
with minimal extra data storage (1 additional RRA).

                 ...Laurie :{)

-----Original Message-----
From: Michael Smith [mailto:msmith at datafoundry.net]
Sent: Friday, 30 June 2000 7:57
To: rrd-users at list.ee.ethz.ch
Subject: [rrd-users] gigabit interfaces



We are relatively new to using rrd and I wanted to get an
opinion/clarification on a configuration.  We have a generic interface 
configuration that consists of

<filename>,
"-b$boot_time",
"-s300",
'DS:InOctets:COUNTER:600:U:U',
'DS:OutOctets:COUNTER:600:U:U',
'RRA:AVERAGE:0.5:1:105408',
'RRA:AVERAGE:0.5:6:700',
'RRA:AVERAGE:0.5:24:775',
'RRA:AVERAGE:0.5:288:797',
'RRA:MAX:0.5:6:700',
'RRA:MAX:0.5:24:775',
'RRA:MAX:0.5:288:797'

Here is the delimma.  Some of the interfaces are Gigabit links.  With the
default step of 300 seconds, these interfaces can wrap more than once.
Mathmatically speaking, they can wrap once every 34 seconds if fully 
loaded.

So, if we reduced the step to 30 seconds, im guessing we have to 
increase the number of samples kept by a factor of 10 as well.
Is that correct?  Has anyone else dealt with this before (high volume
counters constantly wrapping) and what was your solution?

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