use strict;
use warnings;

my %seen = ();
my $flag = 0;
my (@nonprod_lpars, @lparstat, $clntdir);
my $regexp_2_skip = qr/entitled capacity of pool/i;
my $regexp_2_get  = qr/entitled capacity|desired Virtual CPU|desired Memory|online Virtual CPU|maximum Virtual CPU|maximum memory|online memory/i;
my $datacsv        = qq($basedir/nonprod_resource_stats_4_mgmt.csv);
open (my $csv, ">>$datacsv") or die "failed to open $datacsv $!\n";

sub _ce {

print "IN CE SUB\n";

    die "no parameter!\n" unless @_;
    my ($ce_ref) = @_;

    for my $name (@{ $ce_ref }) {
        @asof = +(split("/", $name, 0))[-3,-2,-4];
        $lpname = +(split("/", $name, 0))[3];
        print $csv "$lpname\n";
        print $csv '*' x length($lpname),"\n";
        print '*' x length($lpname),"\n";
        print "$name\n";
        open (my $i, "+<", $name) or warn $!;   ### FAILS HERE ###
        while (<$i>) {
            chomp $i;
            next if $i =~ /$regexp_2_skip/;
            next if $i !~ /$regexp_2_get/;
            ($i) =~ s/:/,/g;
            ($i) =~ s/\s+//g;
            print $csv "$i,\n";
            print "$i,\n";
        }
    }
    print $csv "\n\nHost,Entitled CPU and RAM as of @asof,\n\n";

return;
}

...
...

print "heading into lparstat find $clntdir count of nonprodlpars", scalar @nonprod_lpars;

for my $npll (@nonprod_lpars) {
    next if $npll =~ /null/i;
    print "\nnpll: $npll";
    push @lparstat, qx(/usr/bin/find "$clntdir/$npll" -name $lparstout -mtime 1);
    print " lparstat count:", scalar @lparstat;
}
if ( scalar @nonprod_lpars == scalar @lparstat ) {
    $flag = 1;
    print "\nFLAG:$flag\n";
    _ce( \@lparstat );
}
else {
     print "at top of mtime 2 block\n";
    print "SCALAR NPLPARS ",scalar @nonprod_lpars;
    for my $npll (@nonprod_lpars) {
        next if $npll =~ /null/i;
        push @lparstat, qx(/usr/bin/find "$clntdir/$npll" -name $lparstout -mtime 2);
    }
    print "SCALAR lparstat: ", scalar @lparstat;
    if ( scalar @nonprod_lpars == scalar @lparstat ) {
        $flag = 2;
        _ce( \@lparstat );
    }
.
.
.

__OUT__

$name is clearly getting passed ok from my prints:

No such file or directory at get_nonprod_AIX_resrcs_used.plx line 456.
readline() on closed filehandle $i at get_nonprod_AIX_resrcs_used.plx line 457.
************
/opt/r2configs/twcsapcont01/2018/03/13/lparstat-i.out

and a confirmation it does exist is here

# ls -l /opt/r2configs/twcsapcont01/2018/03/13/lparstat-i.out
-rw-r--r--    1 root     system         2225 Mar 13 21:16 /opt/r2configs/twcsapcont01/2018/03/13/lparstat-i.out