[rrd-users] Re: gigabit interfaces

[Todd Caine]

Micheal,

I've ran into the same issue with the 32 bit counters as
well.  What I have done to work around this is to query
ifSpeed and check if the interface is over 100Mbps.  If the
interface is under 100Mbps I use ifInOctets
(.1.3.6.1.2.1.2.2.1.10) and ifOutOctets
(.1.3.6.1.2.1.2.2.1.16), otherwise I use ifHCInOctets
(.1.3.6.1.2.1.31.1.1.1.6) and ifHCOutOctets
(.1.3.6.1.2.1.31.1.1.1.10).  You shouldn't have too many
problems with the 64 bit counters wrapping!

Cheers,
Todd

Michael Smith wrote:
> 
> 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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