You probably don't actually want a hash of hash (HoH), but a HoA. Consider:

use strict;
use warnings;
use Data::Dumper;

my $inst;
my %host;

while(<DATA>) {
    if (/.*\/DISK\.(.*)\/.*/) {
        $inst = $1;
        next;
    }
    
    my ($dayofweek, $month, $date, $timing, $year, $dpoint) = split;
    push @{$host{$inst}}, {
        'dayofweek' => $dayofweek, 'month' => $month,
        'date' => $date, 'year' => $year,
        'timing' => $timing, 'dpoint' => $dpoint
        };
}

print Dumper(\%host);

__DATA__
wspmon03/DISK.ssd123/DSKAvgServ
     Wed Nov 30 00:01:27 2006 7.34562
     Wed Nov 30 00:02:29 2006 3.31222
     Wed Nov 30 00:03:33 2006 1.23511
     Wed Nov 30 00:04:23 2006 4.97532
     Wed Nov 30 00:05:37 2006 5.31112
     Wed Nov 30 00:06:36 2006 6.22991
wspmon03/DISK.ssd126/DSKAvgServ
     Wed Nov 30 00:01:27 2006 7.34562
     Wed Nov 30 00:02:29 2006 3.31222
     Wed Nov 30 00:03:33 2006 1.23511
     Wed Nov 30 00:04:23 2006 4.97532
     Wed Nov 30 00:05:37 2006 5.31112
     Wed Nov 30 00:06:36 2006 6.22991
wspmon03/DISK.ssd129/DSKAvgServ
     Wed Nov 30 00:01:27 2006 7.34562
     Wed Nov 30 00:02:29 2006 3.31222
     Wed Nov 30 00:03:33 2006 1.23511
     Wed Nov 30 00:04:23 2006 4.97532
     Wed Nov 30 00:05:37 2006 5.31112
     Wed Nov 30 00:06:36 2006 6.22991

[download]

Prints:

$VAR1 = {
          'ssd129' => [
                        {
                          'timing' => '00:01:27',
                          'dpoint' => '7.34562',
                          'date' => '30',
                          'month' => 'Nov',
                          'dayofweek' => 'Wed',
                          'year' => '2006'
                        },
                        {
                          'timing' => '00:02:29',
                          'dpoint' => '3.31222',
                          'date' => '30',
                          'month' => 'Nov',
                          'dayofweek' => 'Wed',
                          'year' => '2006'
                        },
                        {
                          'timing' => '00:03:33',
                          'dpoint' => '1.23511',
                          'date' => '30',
                          'month' => 'Nov',
                          'dayofweek' => 'Wed',
                          'year' => '2006'
                        },
                        {
                          'timing' => '00:04:23',
                          'dpoint' => '4.97532',
                          'date' => '30',
                          'month' => 'Nov',
                          'dayofweek' => 'Wed',
                          'year' => '2006'
                        },
                        {
                          'timing' => '00:05:37',
                          'dpoint' => '5.31112',
                          'date' => '30',
                          'month' => 'Nov',
                          'dayofweek' => 'Wed',
                          'year' => '2006'
                        },
                        {
                          'timing' => '00:06:36',
                          'dpoint' => '6.22991',
                          'date' => '30',
                          'month' => 'Nov',
                          'dayofweek' => 'Wed',
                          'year' => '2006'
                        }
                      ],
          'ssd126' => [
                        {
                          'timing' => '00:01:27',
                          'dpoint' => '7.34562',
                          'date' => '30',
                          'month' => 'Nov',
                          'dayofweek' => 'Wed',
                          'year' => '2006'
                        },
                        {
                          'timing' => '00:02:29',
                          'dpoint' => '3.31222',
                          'date' => '30',
                          'month' => 'Nov',
                          'dayofweek' => 'Wed',
                          'year' => '2006'
                        },
                        {
                          'timing' => '00:03:33',
                          'dpoint' => '1.23511',
                          'date' => '30',
                          'month' => 'Nov',
                          'dayofweek' => 'Wed',
                          'year' => '2006'
                        },
                        {
                          'timing' => '00:04:23',
                          'dpoint' => '4.97532',
                          'date' => '30',
                          'month' => 'Nov',
                          'dayofweek' => 'Wed',
                          'year' => '2006'
                        },
                        {
                          'timing' => '00:05:37',
                          'dpoint' => '5.31112',
                          'date' => '30',
                          'month' => 'Nov',
                          'dayofweek' => 'Wed',
                          'year' => '2006'
                        },
                        {
                          'timing' => '00:06:36',
                          'dpoint' => '6.22991',
                          'date' => '30',
                          'month' => 'Nov',
                          'dayofweek' => 'Wed',
                          'year' => '2006'
                        }
                      ],
          'ssd123' => [
                        {
                          'timing' => '00:01:27',
                          'dpoint' => '7.34562',
                          'date' => '30',
                          'month' => 'Nov',
                          'dayofweek' => 'Wed',
                          'year' => '2006'
                        },
                        {
                          'timing' => '00:02:29',
                          'dpoint' => '3.31222',
                          'date' => '30',
                          'month' => 'Nov',
                          'dayofweek' => 'Wed',
                          'year' => '2006'
                        },
                        {
                          'timing' => '00:03:33',
                          'dpoint' => '1.23511',
                          'date' => '30',
                          'month' => 'Nov',
                          'dayofweek' => 'Wed',
                          'year' => '2006'
                        },
                        {
                          'timing' => '00:04:23',
                          'dpoint' => '4.97532',
                          'date' => '30',
                          'month' => 'Nov',
                          'dayofweek' => 'Wed',
                          'year' => '2006'
                        },
                        {
                          'timing' => '00:05:37',
                          'dpoint' => '5.31112',
                          'date' => '30',
                          'month' => 'Nov',
                          'dayofweek' => 'Wed',
                          'year' => '2006'
                        },
                        {
                          'timing' => '00:06:36',
                          'dpoint' => '6.22991',
                          'date' => '30',
                          'month' => 'Nov',
                          'dayofweek' => 'Wed',
                          'year' => '2006'
                        }
                      ]
        };

[download]

which has the advantage that you don't need to maintain a bogus item count to 'index' into your 'hash' for the individual server information.

As an aside, your sample code had a nasty bug in it. You redefine $inst inside an if block, assigned a value to it (from $1), then throw the value away when the local instance of $inst goes out of scope at the end of the block.

Update: readmore tags added by popular demand.

DWIM is Perl's answer to Gödel

In reply to Re: How to Hash Hashes by GrandFather
in thread How to Hash Hashes by onegative

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