Today, Steven Wagner wrote forth saying...
> Yeah, I already figured that out.
>
> I am going to be a very sad panda if I have to nuke all these RRDs because
> the format's changed.
sad is bad.
here is a way to convert your old RRDs to the new format (i think).
this is untested
# rrdtool tune my_old.rrd --data-source-rename ganglia:sum
i would back it up before you do it (of course).
unformatunately, all your RRDs in your __SummaryInfo__ directories cannot
by converted with rrdtool tune.
you can convert the __SummaryInfo__ rrds by doing the following (again
untested).
# rrdtool dump my_old.rrd > out.xml
in the out.xml file.. you need to change the datasources to read the
following..... there are two datasources "sum" and "num". Sum is the sum
of all the machines metrics and num is the number of machines which were
summed. The old format only had one DS called "ganglia". To get the
number of nodes, the old gmetad made another RRD to num_nodes.rrd which
you can use to grab the "num" data.
<rrd>
<version> 0001 </version>
<step> 15 </step> <!-- Seconds -->
<lastupdate> 1031597578 </lastupdate> <!-- 2002-09-09 11:52:58 PDT -->
<ds>
<name> sum </name>
<type> GAUGE </type>
<minimal_heartbeat> 30 </minimal_heartbeat>
<min> NaN </min>
<max> NaN </max>
<!-- PDP Status -->
<last_ds> UNKN </last_ds>
<value> 3.6168600000e+04 </value>
<unknown_sec> 0 </unknown_sec>
</ds>
<ds>
<name> num </name>
<type> GAUGE </type>
<minimal_heartbeat> 30 </minimal_heartbeat>
<min> NaN </min>
<max> NaN </max>
<!-- PDP Status -->
<last_ds> UNKN </last_ds>
<value> 1.1960000000e+03 </value>
<unknown_sec> 0 </unknown_sec>
</ds>
<!-- Round Robin Archives -->
once your changed the xml, run
# rrdtool restore out.xml my_new_rrd.rrd
do you think we should make some conversion scripts for the 2.5.0 release?
i'm sorry that the RRD format is changed but it's necessary for ganglia to
grow.
-matt
