Can some one help me with the math here?



  • Can anyone tell me what they think the equivalent $$ Savings of trimming 8 TB of data from a mail server farm might be, assuming a large server farm and an estimated total load of 800 TB prior to purging the 8 TB? 



  • Can you rephrase the question?

    Is your statement really  "We already have 800TB storage, and we want to know if it will cost more to buy an additional X TB storage or delete 8TB?"

    Is the storage rented or is it managed locally?

    "Savings..." generally implies a comparison between alternatives, and there are no stated alternatives.



  • Do you mean 800 TB as in 800 terabytes ( 819,200 gigabytes) or was that a typo and you really mean 800 GB?



  • For example:
    Let's say I have 80 TB of storage and am using 75% of same on average.  I Delete 8 TB of data.  I'm saving the company $XX Annually because of the deletion.

    The claim here is $1Million Dollars, but I don't buy it.



  • In http://www.hds.com/assets/pdf/four-principles-for-reducing-total-cost-of-ownership.pdf the following is said:

    @Hitachi whitepaper said:

    1. Price Does Not Equal Cost
    The total cost of acquisition (TCA) for storage is roughly only 20 percent of TCO. Just a few years ago, the
    price of the hardware and software was a much higher portion of TCO, but price erosion has changed that.

    With a TB costing about  $150-200, 8 TB would be $1200-$1600; times 5 for TCO would give $6000-$8000. Let's be generous and make it $10k, but $1M is a bit of a stretch. It gets worse, because you also have to calculate the cost of running out of space, which will often be $10k per incident, easily.


     



  • Yeah, I came up with $120K a year for 20 terabytes of storage (triple redundant RAID 5 NAS), including office rental, utilities, and $80K Salary for a dedicated administrator, including a 10% per annum growth factor. But, as the data storage would share facilities with other services, $120K is major overkill.



  • @Medezark said:

    $80K Salary for a dedicated administrator
     

    Where can I apply?



  • @b-redeker said:

    @Medezark said:

    $80K Salary for a dedicated administrator
     

    Where can I apply?

     

    $80K in American money.

    If you can import that and convert to € on a yearly basis, then yeah, you're pretty wealthy. If you live in the USA, then not so much. A friend of mine does about the same level job as I do, and makes over twice as much, numerically speaking, but between the two of us, I have the most buying power.

    I suppose it could vary greatly from one area to the next. Cities are especially awful.



  • @dhromed said:

    @b-redeker said:

    @Medezark said:

    $80K Salary for a dedicated administrator
     

    Where can I apply?

     

    $80K in American money.

     

    If I get $80k for just monitoring 120 TB, I have about 39 hours per week left to do side jobs. I think I can even do the monitoring remotely from my porch in the Caribean.



  • Ok, I guess we're in agreement that the $1 million a year savings figure uses some kind of "special" math.



  • @b-redeker said:

    @Medezark said:

    $80K Salary for a dedicated administrator
     

    Where can I apply?

     

    That could also be "$80k budget for salary" which really comes to something like a salary of $53k; the other $27k are for payroll and other employment taxes and benefits (general rule of thumb I've heard is that cost of a person is roughly 1.5x their cash salary).

     



  • Unless you live in a WTF place like mine where you get paid in goods and services if anything at all. :(



  • @serguey123 said:

    Unless you live in a WTF place like mine where you get paid in goods and services if anything at all. :(



    You live in the past?



  • $1M is about what a decent 800TB SAN system will cost.  Given the above estimate that cost of ownership is 5 times cost of acquisition, then the cost of ownership should be around $5M for 800TB.  8TB would account for $500K of the total.  The estimate in the millions isn't that far off, but it does seem a bit high.  Also, you really won't "save" that money unless the space can be used for something else.



  • @Jaime said:

    cost of ownership should be around $5M for 800TB.  8TB would account for $500K of the total. 
     

    Er... No. $50k.



  • @b-redeker said:

    @Jaime said:

    cost of ownership should be around $5M for 800TB.  8TB would account for $500K of the total. 
     

    Er... No. $50k.

    At least you now know how the original estimate was made...


  • @Jaime said:

    @b-redeker said:

    @Jaime said:

    cost of ownership should be around $5M for 800TB.  8TB would account for $500K of the total. 
     

    Er... No. $50k.

    At least you now know how the original estimate was made...

    Yes, I now understand that the original estimate was based on just picking a high number out of thin air.



  • HA! I actually got real world numbers! for $1 million a year I can get third party hosting for 180TB of data - with backup.

    8 TB is around $45,000

    So, my call of shenanigans stands!



  • @Medezark said:

    @Jaime said:

    @b-redeker said:

    @Jaime said:

    cost of ownership should be around $5M for 800TB.  8TB would account for $500K of the total. 
     

    Er... No. $50k.

    At least you now know how the original estimate was made...

    Yes, I now understand that the original estimate was based on just picking a high number out of thin air.

    Or they made a similar math error to the one I made.  I was only off by 10% after the error was corrected.

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