Ganglia stores data in so called RRD files (/var/ganglia/rrds or similar
depending on your OS/system).
However, you will not find any detailed historical data there, since de
resolutions/views for month/year are fixed lists of average values
calculated from that time period (month data is NN number of values
averaged from hourly data for a list of month values). And the hour data
is also a fixed list, with only data of the last hour.
This is done to save space, and this way you only have detailed data
from the last hour in RRD's. For each month/year resolution graph it
maintains a extra list of calculated averages.
So I'm afraid you won't find that historical data in Ganglia's RRD
files. You can only get detailed readings from the last hour. I would
suggest a "rrdtool dump" on one of the RRD files to see what data is in
there, and at what grain.
However,
I am just about to graduate on a project, where (among other things) I
wrote a archiving plugin for Ganglia that tracks historical data. This
is however designed for the archiving of cluster jobs(and their nodes)
information, and it will only archive when it is running, so you will
not get that (old) historical data back you are looking for.
Kind regards,
- Ramon
A. Vijay Srinivas wrote:
hi ganglia-folks
this is vijay, a PhD researcher from Indian Institute of Technology
Madras. First of all, let me congratulate the ganglia people for bringing
out a very nice piece of software for open use.
I am looking for historical load data on existing grids. I am able to use
rocks (rocksclusters.org) to get load data, but it gives me graphs, not
actual values. Is it possible to get access to a dump file that has all
the actual values?
Since I need historical data, I cannot download ganglia and start
monitoring existing grids from now, as I need data for the last few years.
If the question is not completely relevant to this list, please let me
know where else it can be posted.
thanks in anticipation
vijay
----------------------------------------------------------
Seek the science of the Maker... and not that of the Made.
- Swami Vivekananda
----------------------------------------------------------
A Vijay Srinivas
PhD Research Scholar
Distributed & Object Systems Lab
Indian Institute of Technology, Madras
http://dos.iitm.ac.in
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