Created attachment 1202851 [details]
ganglia rrd file for test

Description of problem: Wrong scaling while restoring dumped xml rrds. 

This happened during conversion of rrds from 32-bit rrds to 64-bit rrds for a new ganglia installation.


Version-Release number of selected component (if applicable): 1.3.8-7


How reproducible: Each time


Steps to Reproduce:
1. rrdtool dump <test-org.rrd> > <test-org.xml>
2. rrdtool restore <test-org.xml> <test-new.rrd>
3. rrdtool dump <test-new.rrd> > <test-new.xml>

Compare <test-org.xml> and <test-new.xml>.

Actual results:

After step 1:

	<!-- Round Robin Archives -->
	<rra>
		<cf>AVERAGE</cf>
		<pdp_per_row>1</pdp_per_row> <!-- 15 seconds -->

		<params>
		<xff>5.0000000000e-01</xff>
		</params>
		<cdp_prep>
			<ds>
			<primary_value>8.9886666667e+01</primary_value>
			<secondary_value>8.4646666667e+01</secondary_value>
			<value>NaN</value>
			<unknown_datapoints>0</unknown_datapoints>
			</ds>
		</cdp_prep>
		<database>
			<!-- 2016-09-18 17:15:15 CEST / 1474211715 --> <row><v>8.2753333333e+01</v></row>
			<!-- 2016-09-18 17:15:30 CEST / 1474211730 --> <row><v>7.7713333333e+01</v></row>
			<!-- 2016-09-18 17:15:45 CEST / 1474211745 --> <row><v>9.3706666667e+01</v></row>
			<!-- 2016-09-18 17:16:00 CEST / 1474211760 --> <row><v>9.5700000000e+01</v></row>

....


After step 2: 

Mangled graphs from rrd in ganglia web frontend


After step 3:


<!-- Round Robin Archives -->	<rra>
		<cf> AVERAGE </cf>
		<pdp_per_row> 1 </pdp_per_row> <!-- 15 seconds -->

		<params>
		<xff> 5.0000000000e+00 </xff>
		</params>
		<cdp_prep>
			<ds>
			<primary_value> 8.0000000000e+00 </primary_value>
			<secondary_value> 8.0000000000e+00 </secondary_value>
			<value> NaN </value>
			<unknown_datapoints> 0 </unknown_datapoints>
			</ds>
		</cdp_prep>
		<database>
			<!-- 2016-09-18 17:15:15 CEST / 1474211715 --> <row><v> 8.0000000000e+00 </v></row>
			<!-- 2016-09-18 17:15:30 CEST / 1474211730 --> <row><v> 7.0000000000e+00 </v></row>
			<!-- 2016-09-18 17:15:45 CEST / 1474211745 --> <row><v> 9.0000000000e+00 </v></row>
			<!-- 2016-09-18 17:16:00 CEST / 1474211760 --> <row><v> 9.0000000000e+00 </v></row>

....


Expected results:

Both dump files should be identical.


Additional info:

rrdtool from Fedora 23 works as expected. Version tested is rrdtool-1.5.3-4.fc23.x86_64. Dump-Restore-Dump cylce leads to identical files.