If I understand your question correctly, you are trying to put the device data into a file format that would be easy to load into a perl data structure, like a hash of hashes.
You could read an XML config file with
XML::Simple.
I think that would be more readable and maintainable than using
Data::Dumper.
For example:
<config>
<drive name="C" used_oid="1.2.3.4.5.1" size_oid="1.2.3.4.6.1"/>
<drive name="D" used_oid="1.2.3.4.5.3" size_oid="1.2.3.4.6.3"/>
<drive name="E" used_oid="1.2.3.4.5.3" size_oid="1.2.3.4.6.3"/>
</config>
Then pull it in using:
use strict;
use XML::Simple;
my $config = XMLin("www.xml");
my $drivename = "C";
print $config->{drive}->{$drivename}->{used_oid},"\n";
Update: Added an initial problem restatement.
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