Veritas-bu

[Veritas-bu] Calculating physical/virtual tape library utilization via NBU

2007-09-24 15:43:28
Subject: [Veritas-bu] Calculating physical/virtual tape library utilization via NBU
From: <mikemclain AT northwesternmutual DOT com>
To: <veritas-bu AT mailman.eng.auburn DOT edu>
Date: Mon, 24 Sep 2007 14:23:48 -0500

<<lib_usage>>

Attached is a Perl script that we use to calculate the capacity and usage of our physical and virtual tape libraries.   It parses the available_media output and based on the average capacity of each "FULL" tape, it is able to determine an approximate capacity and usage of the whole library.    It's not exact, but saves time not having to bplabel virtual tapes to see the capacity in the VTL.

Note:  For VTLs, this calculation only works if thin provisioning or over allocation is not used.


Sample output:

    Robot: 1 - Total number of HCART2 FULL tapes: 59
    Robot: 1 - Total amount of data on HCART2 FULL tapes (GB): 30502
    Robot: 1 - Average HCART2 tape holds(GB): 516
    Robot: 1 - Number of non-FULL tapes: 111
    Robot: 1 - Total data on non-FULL tapes(GB): 11077
    Robot: 1 - Total tapes allocated: 188
    Robot: 1 - Estimated total possible capacity:    97008
    Robot: 1 - Amount of data left on tape(GB): 46199
    Robot: 1 - With 188 tapes of type HCART2 the amount used is 43%

    Robot: 2 - Total number of HCART FULL tapes: 767
    Robot: 2 - Total amount of data on HCART FULL tapes (GB): 22890
    Robot: 2 - Average HCART tape holds(GB): 29
    Robot: 2 - Number of non-FULL tapes: 522
    Robot: 2 - Total data on non-FULL tapes(GB): 1496
    Robot: 2 - Total tapes allocated: 1300
    Robot: 2 - Estimated total possible capacity:    37700
    Robot: 2 - Amount of data left on tape(GB): 13642
    Robot: 2 - With 1300 tapes of type HCART the amount used is 65%

    Robot: 3 - Total number of HCART FULL tapes: 806
    Robot: 3 - Total amount of data on HCART FULL tapes (GB): 25001
    Robot: 3 - Average HCART tape holds(GB): 31
    Robot: 3 - Number of non-FULL tapes: 466
    Robot: 3 - Total data on non-FULL tapes(GB): 874
    Robot: 3 - Total tapes allocated: 1300
    Robot: 3 - Estimated total possible capacity:    40300
    Robot: 3 - Amount of data left on tape(GB): 13572
    Robot: 3 - With 1300 tapes of type HCART the amount used is 64%


Hopefully someone will find this useful.    Comments and suggestions are always welcome.


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Attachment: lib_usage
Description: lib_usage

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