Hello,
I'm trying to add a new RRA to an RRD file. I need to preserve my old
data.
I found a post in the list archive that suggested I do a dump, and
modify the RRD and then restore the old data into the new RRD. So this
is what I tried to do.
I created a new RRD with the default RRAs, plus a new one.
rrdtool create cpu_pool_idle_new.rrd --step 15 \
DS:sum:GAUGE:120:U:U \
RRA:AVERAGE:0.5:1:244 \
RRA:AVERAGE:0.5:24:244 \
RRA:AVERAGE:0.5:168:244 \
RRA:AVERAGE:0.5:672:244 \
RRA:AVERAGE:0.5:5760:374 \
RRA:MIN:0.5:60:2980 # <---------- NEW RRA
I then dumped the new rrd and copied the new RRA section into a file,
called append.xml.
Then I wrote a perl script to insert the new RRA into the xml dump of my
existing RRD. I then restored the modified xml file into a new RRD.
I saved off the old rrd, and replaced it with the new RRD, hoping that
gmetad will continue to update the new RRD without missing a beat.
That did not happen. The new RRD doesn't receive any new updates, or
gmetad doesn't send it updates any more.
I restarted gmetad but that didn't help.
Can someone tell me what I'm doing wrong here? Do you have a better
suggestion?
Thanks.
#!/usr/bin/perl
# $oldxmlfile="cpu_pool_idle.xml";
# $oldrrdfile="cpu_pool_idle.rrd";
# $newrrdfile="cpu_pool_idle_new.rrd";
# $newxmlfile="cpu_pool_idle_new.xml";
$oldxmlfile="pkts_in.xml";
$oldrrdfile="pkts_in.rrd";
$newrrdfile="pkts_in_new.rrd";
$newxmlfile="pkts_in_new.xml";
$appendxmlfile="append.xml";
system("rrdtool dump $oldrrdfile > $oldxmlfile");
open OLDXML, ("< $oldxmlfile");
open NEWXML, ("> $newxmlfile");
open APPENDXML, ("< $appendxmlfile");
my(@oldxml) = <OLDXML>; # read file into list
my(@appxml) = <APPENDXML>;
for (@oldxml) {
if (! /<\/rrd\>/) {
print NEWXML $_;
} else {
for $appline (@appxml) {
print NEWXML $appline;
}
print NEWXML $_;
last;
}
}
close (OLDXML);
close (NEWXML);
close (APPLENDXML);
system("rrdtool restore $newxmlfile $newrrdfile");
system("cp -p $oldrrdfile $oldrrdfile.org");
system("cp -p $newrrdfile $oldrrdfile");
David Wong
Senior Systems Engineer
Management Dynamics, Inc.
Phone: 201-804-6127
[EMAIL PROTECTED]
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