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 413132 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 update. 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. -T ----- Tarus Balog The OpenNMS Group, Inc. Main : +1 919 545 2553 Fax: +1 503-961-7746 Direct: +1 919 647 4749 Skype: tarusb Key Fingerprint: 8945 8521 9771 FEC9 5481 512B FECA 11D2 FD82 B45C -- Unsubscribe mailto:[EMAIL PROTECTED] Help mailto:[EMAIL PROTECTED] Archive http://lists.ee.ethz.ch/rrd-users WebAdmin http://lists.ee.ethz.ch/lsg2.cgi
