This is actually a followup to a question one of my co-workers posted last week. I think what I was really wanting to know might have gotten lost in the translation. I'm not really worried about memory or CPU, but rather Disk I/O. I got burned bad before when a former co-worker went graph crazy.
When an existing RRD file is updated, it is of course the same size file before and after the update. However, how is the file actually updated/written. Is it the case that only the new value is written in the file, overwriting the previous value and some sort of pointer updated. OR Is the entire RRD file re-written each time its updated? Beyond how, how about when a consolidation occurs? I realize this might depend on version of RRD tool, how its compiled, OS, etc, but hopefully you all can give me a little insight. I realize that a lot of you are saying rrdcache helps, but when working within a product with a support contract (even if its open source), sometimes one has to wait till the vendor implements it. I think in this case since we are using Zenoss Enterprise with a support contract, I'm going to have to do any tuning, etc via the OS and Disk Sub-System for now and not count on being able to use rrdcache. Thanks for any thoughts or insights you all might have. Andy -- Andy Fleming - RHCE Sr Systems Administrator Kansas Research and Education Network [email protected] Office: 785-856-9800 x 201 KanREN - Advanced Network Solutions for the Research and Education Community _______________________________________________ rrd-users mailing list [email protected] https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users
