You should include the warnings and strict pragmas in your code to help you locate mistakes. After I corrected the error on line 159 I compiled with warnings enabled which produced these messages: 
Unquoted string "true" may clash with future reserved word at 555648.p
+l line 98.
Bareword found in conditional at 555648.pl line 146.
main::showUsage() called too early to check prototype at 555648.pl lin
+e 27.
main::spinUpRoutine() called too early to check prototype at 555648.pl
+ line 32.
main::mainRoutine() called too early to check prototype at 555648.pl l
+ine 33.
main::spinDownRoutine() called too early to check prototype at 555648.
+pl line 34.
Name "main::targetVGSpaceRemaiing" used only once: possible typo at 55
+5648.pl line 127.

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if ($#ARGV!=6)

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Your program requires seven arguments so why are you obfuscating that fact? 
if ( @ARGV != 7 )

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All of your subroutines except spinDownRoutine() are only called once. Subroutines are very handy if you have to encapsulate data and code that has to be used multiple times however you are neither encapsulating the data in the subroutine nor using them more than once so why put everything in subroutines?

In reply to Re: MoveCeiling - monitor filesystem growth by jwkrahn
in thread MoveCeiling - monitor filesystem growth by bpoag

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