[rrd-users] Who has the most RRD files (or data sources)?

Tarus Balog tarus at opennms.org
Thu Mar 16 00:40:59 MET 2006

On Mar 15, 2006, at 3:20 PM, Mark Plaksin wrote:

> Who has the most RRD files (or total data sources in RRDs)?

This is from an ISP in Oregon:

-bash-3.00$ find . -name "*rrd" | wc -l

We have a couple of client that large.

>   How frequently are they updated?

Once every five minutes.

> What do you use to update them?

OpenNMS. Each file is 283K long containing ~24K rows, and they each  
represent a single SNMP variable. We found that with so many small  
files it is easy to overload the disk I/O (and please, please don't  
use RAID-5), so if we miss writing one value we will store it until  
we get the opportunity to write it again. It takes almost as much  
time to write 2 or 3 values as it does one, so we get caught up.  
Without such a queue, the smallest load on the filesystem (like the  
one I caused doing the find above) would result in the application  
getting farther and farther behind until it crashed. Now once steady  
state is reached after startup, you can almost set your watch by the  

Hardware notes: this is a Sun v440 with 8GB of RAM connected via NFS  
to a NetApp NAS. Without the NetApp it would be almost impossible to  
handle the load.



Tarus Balog
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